[11:39:14] EX2104_DIVE12 ROV powered off [11:43:07] DIVE12 test message from Okeanos Explorer [12:12:13] EX2104_DIVE12 ROV Launch [12:19:49] EX2104_DIVE12 ROV on Surface [12:20:39] EX2104_DIVE12 ROV Descending [12:21:25] LAT : 35.222535 , LON : -58.03213 , DEPTH : 13.63 m, TEMP : 26.16196 C, SAL : 36.34153 PSU, DO : 6.7921 mg/l [12:26:26] LAT : 35.221563 , LON : -58.033404 , DEPTH : 79.675 m, TEMP : 19.56884 C, SAL : 36.62851 PSU, DO : 7.66793 mg/l [12:31:26] LAT : 35.221374 , LON : -58.034079 , DEPTH : 236.7371 m, TEMP : 18.77429 C, SAL : 36.63847 PSU, DO : 6.89413 mg/l [12:36:27] LAT : 35.221403 , LON : -58.03437 , DEPTH : 387.5124 m, TEMP : 18.31091 C, SAL : 36.56137 PSU, DO : 6.62327 mg/l [12:41:27] LAT : 35.22131 , LON : -58.034577 , DEPTH : 536.9903 m, TEMP : 16.10138 C, SAL : 36.16127 PSU, DO : 5.82402 mg/l [12:46:28] LAT : 35.221191 , LON : -58.034535 , DEPTH : 684.5647 m, TEMP : 13.51605 C, SAL : 35.75503 PSU, DO : 5.20729 mg/l [12:51:28] LAT : 35.22115 , LON : -58.034454 , DEPTH : 837.9146 m, TEMP : 10.07679 C, SAL : 35.30878 PSU, DO : 4.67446 mg/l [12:56:28] LAT : 35.221134 , LON : -58.034266 , DEPTH : 990.8942 m, TEMP : 7.21341 C, SAL : 35.15095 PSU, DO : 6.02362 mg/l [13:01:28] LAT : 35.221015 , LON : -58.034227 , DEPTH : 1143.2394 m, TEMP : 5.9841 C, SAL : 35.1201 PSU, DO : 7.02977 mg/l [13:06:30] LAT : 35.220959 , LON : -58.03412 , DEPTH : 1303.8445 m, TEMP : 5.31756 C, SAL : 35.08515 PSU, DO : 7.59356 mg/l [13:11:30] LAT : 35.220978 , LON : -58.034178 , DEPTH : 1460.3564 m, TEMP : 4.75859 C, SAL : 35.03444 PSU, DO : 7.97499 mg/l [13:16:30] LAT : 35.220963 , LON : -58.034218 , DEPTH : 1618.8116 m, TEMP : 4.30802 C, SAL : 34.99664 PSU, DO : 8.21803 mg/l [13:21:31] LAT : 35.220981 , LON : -58.034246 , DEPTH : 1778.2182 m, TEMP : 4.1086 C, SAL : 34.98311 PSU, DO : 8.26391 mg/l [13:26:32] LAT : 35.220911 , LON : -58.034228 , DEPTH : 1923.8051 m, TEMP : 3.91294 C, SAL : 34.97211 PSU, DO : 8.33531 mg/l [13:31:33] LAT : 35.220945 , LON : -58.03429 , DEPTH : 1999.1067 m, TEMP : 3.86186 C, SAL : 34.97279 PSU, DO : 8.26253 mg/l [13:35:10] Depth for todays dive is 2840m; currently at 2100m depth [13:36:34] LAT : 35.220896 , LON : -58.034309 , DEPTH : 2144.8076 m, TEMP : 3.72085 C, SAL : 34.96858 PSU, DO : 8.22836 mg/l [13:41:34] LAT : 35.220889 , LON : -58.034237 , DEPTH : 2296.697 m, TEMP : 3.5731 C, SAL : 34.96244 PSU, DO : 8.19672 mg/l [13:46:35] LAT : 35.220867 , LON : -58.034116 , DEPTH : 2449.0658 m, TEMP : 3.45012 C, SAL : 34.95745 PSU, DO : 8.21117 mg/l [13:48:37] iscwatch leaves the room [13:51:36] LAT : 35.220872 , LON : -58.03411 , DEPTH : 2596.5099 m, TEMP : 3.32835 C, SAL : 34.95406 PSU, DO : 8.1586 mg/l [13:56:37] LAT : 35.220828 , LON : -58.034043 , DEPTH : 2701.8977 m, TEMP : 3.21381 C, SAL : 34.95225 PSU, DO : 8.09308 mg/l [13:57:38] 2700m depth [14:01:37] LAT : 35.22068 , LON : -58.033658 , DEPTH : 2749.6535 m, TEMP : 3.17991 C, SAL : 34.95051 PSU, DO : 8.09242 mg/l [14:01:47] Morning! no bottom yet? [14:02:09] 55m off bottom right now. Morning! [14:04:12] 25m off bottom [14:04:15] bottom in sight [14:05:17] sponge in view) [14:05:42] and fish [14:06:03] EX2104_DIVE12 ROV on Bottom [14:06:10] Halosaur [14:06:38] LAT : 35.220716 , LON : -58.03379 , DEPTH : 2803.8517 m, TEMP : 3.13206 C, SAL : 34.94807 PSU, DO : 8.14886 mg/l [14:08:43] xenophyophore [14:09:57] I always wondered how these ripples originate. It is easy to understand when ou are at the sandy beach, but so deep.. [14:10:23] seems like this rock caused damade of dead coral [14:11:38] LAT : 35.220625 , LON : -58.033756 , DEPTH : 2805.1939 m, TEMP : 3.13554 C, SAL : 34.94776 PSU, DO : 8.03848 mg/l [14:13:16] can we zoom at urchin test? [14:13:35] too late) [14:14:37] kelseyviator leaves the room [14:15:14] coral? [14:16:11] emilycrum leaves the room: Replaced by new connection [14:16:28] sponge [14:16:39] LAT : 35.220533 , LON : -58.033632 , DEPTH : 2808.8456 m, TEMP : 3.13054 C, SAL : 34.94816 PSU, DO : 8.11338 mg/l [14:17:11] Love the complete overlap in morphology among phyla! [14:17:14] if there are more, I suggest to sample. there is one more ahead [14:18:55] at Rio Grabde they have coral-mimicing sponges [14:19:04] Rio Grange [14:19:12] Rio Grande Rise in SE Atlantic? [14:19:23] **SW [14:19:50] It's really unusual - i've seen others that are more similar to corals (we saw some in the last dive), but this is such a fraud! [14:20:14] https://www.researchgate.net/publication/321204022_Deep-sea_dives_reveal_an_unexpected_hexactinellid_sponge_garden_on_the_Rio_Grande_Rise_SW_Atlantic_A_mimicking_habitat [14:20:24] It is "unusual" in the sense we don't see them often, but not so unusual we don't see them. They are characteristic of deeper areas, likely where the quiescent currents allow for such fine branching. Here is an example from the BAG: https://www.ncei.noaa.gov/waf/okeanos-animal-guide/Poecilosclerida054.html [14:20:57] Normally Cladorhizidae looking like corals but this one probably Hexactinellid [14:21:40] LAT : 35.220528 , LON : -58.033686 , DEPTH : 2811.0683 m, TEMP : 3.13026 C, SAL : 34.94706 PSU, DO : 8.11518 mg/l [14:21:44] agree Tina, this looks very Hex [14:22:25] The similar one I sent an image of is a demosponge in the Poecilosclerida [14:23:23] Yes. Scott's image is better) [14:23:25] emilycrum leaves the room [14:23:47] 1504 is Atlantic? from here? [14:25:34] @Tina: no, central Pacific [14:26:40] LAT : 35.220562 , LON : -58.033747 , DEPTH : 2808.4935 m, TEMP : 3.15436 C, SAL : 34.94699 PSU, DO : 8.11084 mg/l [14:26:55] may be these stalks are also from sponges [14:27:21] just joined. seems this rock has a more than a patina of FeMn which infers it may not be a drop stone. But I haven't seen the surrounding geo yet. [14:28:12] what is this sticj just behind the sample? [14:28:21] can we zoom? [14:29:19] its a great shape, fingers crossed [14:29:24] Its a coral fossil [14:29:35] not black [14:29:43] greyish and flexible [14:30:00] may be polychaete tube [14:30:35] upper [14:30:55] it was a but up. [14:31:24] Ah - polychaete [14:31:39] yepm think so [14:31:42] LAT : 35.220484 , LON : -58.033684 , DEPTH : 2809.5259 m, TEMP : 3.13032 C, SAL : 34.94839 PSU, DO : 8.08431 mg/l [14:32:17] Yes @Kevin - hard to tell what the rock it/where, but fingers crossed. [14:32:30] *is/where from [14:32:30] Johndeitz leaves the room [14:33:56] and by position of ripples we can tell rirection of currents? [14:35:09] white dots are shells or pteropods? [14:35:17] @tina Yes, in the mid-Pacific there are similar currents at the base and top of the guyots, you can trace bottom direction and strength based on them [14:35:59] local accumulation of shells [14:36:10] @kevin - thoughts on these crust-y features? Is that an igneous morphology [14:36:41] LAT : 35.220517 , LON : -58.033688 , DEPTH : 2806.6866 m, TEMP : 3.12015 C, SAL : 34.94764 PSU, DO : 8.10664 mg/l [14:36:57] yeah, I think they're FeMn flow tops. Likely had periods without sediment cover in order to build up a FeMn crust [14:37:07] under ledge is usually good place [14:38:31] Gastropods and Serpulids [14:38:35] is that a loose rock to the left of camera? Thick angular, maybe basalt, might be in-situ or too large [14:38:39] and stalked sponges [14:39:44] crionoid above? [14:40:43] black coral, actually [14:40:52] Heteropathes [14:41:11] We are looking down on it from above [14:41:14] perhaps Heteropathes opreski [14:41:31] lovely picture [14:41:42] LAT : 35.220545 , LON : -58.033771 , DEPTH : 2807.3456 m, TEMP : 3.13419 C, SAL : 34.94675 PSU, DO : 8.11386 mg/l [14:42:04] Johndeitz leaves the room [14:42:31] I would expect blacvk corals to be the most diverse corals at this depth... Perhaps sea pens if we continue in soft sediments... [14:42:49] I saw the rock, Kevin. will keep my eyes out. seemed they were having a tough time holding position there to check it out. [14:42:52] yes for sure, keeping eyes peeled for sea pens [14:43:32] sponge ahead [14:46:24] from this distance looks like a Corallium... [14:46:40] yes... [14:46:44] LAT : 35.220608 , LON : -58.033911 , DEPTH : 2799.1723 m, TEMP : 3.12717 C, SAL : 34.94756 PSU, DO : 8.07602 mg/l [14:47:37] zoo-bolder [14:47:41] Looks like maybe a mass wasting deposit [14:48:37] Nice! [14:49:38] This is exactly the sort of pattern we saw in the Pacific with those Stelodoryx. I recall one dive where they were the dominant fauna. [14:50:10] Yes, Corallium - related to the Mediterranean precious pink corals. [14:50:35] At this depth could be C. bathyrubrum [14:51:21] @Rhian - FYI offline Chris Mah convinced me that brisingids can't swim based on the rigidity of their ossicles (though the arms of the brisingid we just saw look very "flexible" in how they wrapped around a narrow stalk, so they have considerable range of motion. But maybe not the musculature.) Anyway, no support/need for spending any time with a swim test. [14:51:31] it was good to collect this sponge [14:51:37] Thanks @Cindy! [14:51:42] Note most of those sponges aligned along the high point/ledge edge [14:51:44] LAT : 35.220526 , LON : -58.034005 , DEPTH : 2792.8716 m, TEMP : 3.13464 C, SAL : 34.94844 PSU, DO : 8.08604 mg/l [14:52:41] The steeper face may thrust currents straight up than the other side. Better for feeding flow...? [14:52:43] real glass sponge down there [14:53:34] or the current distribution on the ridge reflects post-settlement survival ... predation ... we generally don't know about these small scale processes in the deep sea [14:54:31] Bamboo coral ahead...? [14:54:36] I'd be happy with a good angular rock from this deposit, likely sourced from the ridge we're scaling. Up to Kira tho [14:55:05] Seen better days... [14:55:14] predation is definitely a factor we don't understand @Peter [14:55:25] Chrysogorgia below [14:55:32] @scott ... some days I feel like that! [14:55:54] Still barely alive [14:56:07] a few polyps hangings on in 2 clumps of small branches [14:56:18] one upper left, one far right [14:56:29] whatch for a star [14:56:44] LAT : 35.220687 , LON : -58.034026 , DEPTH : 2789.4115 m, TEMP : 3.13245 C, SAL : 34.9479 PSU, DO : 8.08668 mg/l [14:56:53] So old the nodes have been overgrown, or the proteain has degraded from them [14:57:24] Amazing some of it is still hanging on [14:57:29] quite particular sclerites [14:58:21] there is another stick coral at the background [14:58:31] It is very old, and the tissue has been gone long enough to have skeleton overgrown by hydroids. So not a recent predation event. [14:59:34] @Kevin, I wonder if the rock we collected might be an ambitiously cascading rock from this flow [14:59:55] some boulders are better then others.... [15:00:08] That's the hope, it's not that far down hill from here [15:01:45] LAT : 35.220551 , LON : -58.034132 , DEPTH : 2786.5753 m, TEMP : 3.13813 C, SAL : 34.94818 PSU, DO : 8.06973 mg/l [15:02:08] below was half-dead possible Farreidae [15:03:09] kelseyviator leaves the room [15:05:22] Kelseyviator leaves the room: Replaced by new connection [15:06:45] LAT : 35.220545 , LON : -58.034192 , DEPTH : 2784.8141 m, TEMP : 3.13796 C, SAL : 34.94847 PSU, DO : 8.0859 mg/l [15:06:52] not Stauropathes [15:07:44] it is a bot bad projection, May be Trissopathes or Parantipathes [15:10:05] Actually when we have crash with chat, most of speciea Scott called Stauropathes were in fact Leiopathes... [15:10:13] Not like any Parantipathes I remember! [15:10:20] looks like a bony eared assfish ... really! spins off the back of the operculum [15:10:30] snap zoom on head area? [15:10:36] @Tina: ??? [15:11:23] mmm ... maybe [15:11:45] LAT : 35.220682 , LON : -58.034154 , DEPTH : 2785.5575 m, TEMP : 3.1315 C, SAL : 34.94921 PSU, DO : 8.10653 mg/l [15:12:00] "spine" not "spin" [15:12:04] yes, it looks more like cladopathidae, this one, but really hard to tell when we see it from the back [15:12:26] @Peter - looks really different from the assfish that we saw before.... [15:12:33] (otherwise I was primed to say it!!) [15:12:37] Thanks! [15:13:27] And if Rhian wasn't, I was! [15:13:28] yeah ... the far view looked like the characteristic spines but the zoom looked different ... just another old ophidiid [15:13:41] Old and warty [15:13:46] I'm poised...... [15:14:17] will peruse the still frame later [15:14:25] this one probably had anastomoses.. that is wrong. May be Cladopathes, actually, but still wrong side [15:15:14] Bathypathes [15:15:17] @Tina: I could accept Trissopathes as well. I think we can agree likely Cladopathidae [15:15:33] Great rocks here, if it's safe to land [15:15:51] with polychaete [15:15:54] forked branch on left [15:16:08] actually I was going to ask about zoom of this species [15:16:28] @chris may be regenerated [15:16:32] @Chris: did you mean on the Bathypathes? [15:16:39] Ahh, that's probably it [15:16:46] LAT : 35.220693 , LON : -58.034265 , DEPTH : 2779.815 m, TEMP : 3.12487 C, SAL : 34.94713 PSU, DO : 8.06818 mg/l [15:16:54] @scott, yep [15:17:28] but it was really forked)) 10 degree or less [15:17:59] christopherkelley leaves the room [15:18:00] @kevin, shout out if you see something you love [15:18:23] emilycrum leaves the room [15:18:33] angular and fat, lots of options. I'll shout out when the ROV settles [15:19:21] I think the rock on the bottom center. just below the right of the 'n' shaped structure [15:20:32] haroldcarlson leaves the room [15:21:47] LAT : 35.220745 , LON : -58.034265 , DEPTH : 2778.9208 m, TEMP : 3.10857 C, SAL : 34.94904 PSU, DO : 8.05625 mg/l [15:22:01] huh, weird that it's all stuck... [15:22:47] @kira, in Pacific they always stuck, ask Cris [15:23:54] I wonder if Fe-Mn crust is cementing them [15:24:05] we see that often [15:24:33] Can build some stratigraphy, mass wasting then FeMn cementing then sedi cover [15:25:19] Looks good to me [15:25:36] Just joining. Looked back to bottom contact. Nice imagery of Acanthonus armatus, bulbous headed fish. The Ophidioid is actually one of the most common fishes inhabiting 2000-3000 m depth [15:26:46] Definitely has a brittle crust. Might be a heavily altered pillow given the oxidized colors [15:26:48] LAT : 35.220735 , LON : -58.034207 , DEPTH : 2776.6025 m, TEMP : 3.11953 C, SAL : 34.96236 PSU, DO : 8.05887 mg/l [15:27:11] Fingers crossed, could get fresher towards the core of the sample [15:28:06] Acanthonus has the smallest brain to body ratio of any fish. It has enormous semi-circular canals use to control orientation while hovering and sculling slowly. Common attitudes are head up or head down, or an oblique posture. The very large cranial cavity with that tiny brain is filled with light ion fluid (probably lithium chloride) that serves as a floatation device [15:28:23] Thanks, good work [15:28:31] There was some debate Ken as to whether it was an Acanthonus. [15:28:56] I see Ken has a much more polite common name for Acanthonus armatus! [15:29:10] :) [15:29:19] kimberlygalvez leaves the room [15:29:29] UNless that was just descriptive... [15:31:47] LAT : 35.220683 , LON : -58.034339 , DEPTH : 2771.5496 m, TEMP : 3.11936 C, SAL : 34.94571 PSU, DO : 8.09934 mg/l [15:32:12] Yep - whomever named the common name was a daring person. I do not like that name. Spiny-cheek is OK. There are enormous long, bony spines hidden somewhat under the fleshy lobes of the gill covers, and also a sharp forked spine at the tip of the snout - also embedded. Woe unto a would be predator - which would end up with a mouth pierced in many directions. [15:34:11] nice bamboo, still alive [15:36:47] LAT : 35.220738 , LON : -58.034382 , DEPTH : 2770.526 m, TEMP : 3.10744 C, SAL : 34.94948 PSU, DO : 8.07065 mg/l [15:36:56] kelseyviator leaves the room [15:41:17] kensulak leaves the room [15:41:48] LAT : 35.220671 , LON : -58.034373 , DEPTH : 2766.4768 m, TEMP : 3.0989 C, SAL : 34.94613 PSU, DO : 8.08906 mg/l [15:42:03] Actinoscyphia is the anemone [15:42:44] kelseyviator leaves the room [15:43:04] is it corallidae behind? [15:44:03] haroldcarlson leaves the room [15:45:09] @Tina: I thought Chrysogorgia. Did I mispeak? mis... look? [15:45:53] @scott, it was flat [15:46:13] lookes same as these feeble Corallium before [15:46:23] @Tina: my bad! [15:46:32] I was silent) [15:46:38] @Tina: guess I was too focused on the bamboo coral. [15:46:49] LAT : 35.220717 , LON : -58.034481 , DEPTH : 2763.1479 m, TEMP : 3.10126 C, SAL : 34.94905 PSU, DO : 8.06868 mg/l [15:46:53] it was LOVELY bamboo [15:47:21] I think we will have more [15:48:15] this one may be Chryso [15:49:35] Too deep for most scleractinians [15:49:36] it was only one cupcoral unde ledge [15:50:15] it was absolutely alive with tentacles [15:51:49] LAT : 35.220751 , LON : -58.03448 , DEPTH : 2758.7153 m, TEMP : 3.09429 C, SAL : 34.94781 PSU, DO : 8.05545 mg/l [15:52:35] lovely sponges [15:52:42] one cup coral so far I think [15:53:20] right it was superboulder with supersponges [15:55:09] vondawarehamhayes leaves the room [15:55:18] christophermah leaves the room [15:55:55] kensulak leaves the room: Replaced by new connection [15:56:14] but some scleractinians - few species, e.g. Fungiocyathus - live in trenches, ~~ 5000 m and deeper [15:56:49] LAT : 35.220643 , LON : -58.034624 , DEPTH : 2751.7782 m, TEMP : 3.12329 C, SAL : 34.94701 PSU, DO : 8.03692 mg/l [15:59:26] can we look at what you call stauropathes? [15:59:48] They'd already moved Tina, if thye come back this way... [16:00:25] Pilot watch change [16:00:46] I am not sure about Stauropathes [16:00:51] right there Tina! [16:01:50] LAT : 35.220701 , LON : -58.034654 , DEPTH : 2743.8057 m, TEMP : 3.10851 C, SAL : 34.94813 PSU, DO : 8.05602 mg/l [16:01:58] What do you think it might be TIna? [16:02:12] was out of focus [16:02:34] nice sponge ahead [16:05:32] haroldcarlson leaves the room [16:06:10] peterauster leaves the room [16:06:19] any idea what the barnacles are? [16:06:46] goose neck barnacles [16:06:50] LAT : 35.220832 , LON : -58.034693 , DEPTH : 2739.5513 m, TEMP : 3.10694 C, SAL : 34.94776 PSU, DO : 8.07755 mg/l [16:07:37] Barnacles look like Poecilasmatidae [16:07:40] These are mistical volcanic polyps? [16:08:25] re: barnacles - thanks! [16:09:03] @Tina: not the "volcano" polyps that define Eknomisis. [16:09:59] @scott, Ok, I have to learn more soem isidiology [16:10:06] But in general the pattern of contraction gives us clues to the complement of sclerites in the polyp body wall. Those with longer rods and needles cannot contract much, but those with short rods and scales can contract a lot. [16:11:07] @Tina: actually, I used the branch pattern to help there. Eknomisis is an internodal brancher. But we could have similar contracted polyp morpholgies across genera. [16:11:26] in case of black corals.. in case of long spines.. they still can contract, but very incomfortably [16:11:41] kelseyviator leaves the room [16:11:51] LAT : 35.220772 , LON : -58.034828 , DEPTH : 2730.9787 m, TEMP : 3.09238 C, SAL : 34.94732 PSU, DO : 8.07069 mg/l [16:12:05] Interesting that the barnacles are extended and feeding, but the bamboo corals are not. Suggests that the current is transporting particles - being fed upon by barnacles. [16:12:45] do deep-sea corals tend to have large dispersal potentials and planktonic larval durations? [16:14:01] most of speculation about deep-sea coral larval dispersal is speculations [16:14:03] @Harold: great question! I have no good answer for you. Some species have very broad distributions tat would suggest enhanced dispersal, but it could also be age related [16:14:43] The barnacles are facing into the current - the extended coral polyps are facing opposite. Could be that the current is too strong at this time for most of the coral polyps?? [16:15:02] normally we know almost nothing about larvae, and Rhian is the best to know about larvae [16:15:10] Also, we don't yet have the genetic tools to answer that question. [16:15:19] @scott, it is the same species? [16:16:52] LAT : 35.220905 , LON : -58.034822 , DEPTH : 2728.5592 m, TEMP : 3.0808 C, SAL : 34.94681 PSU, DO : 8.07849 mg/l [16:17:21] @scott,tina,rhian add that to the long list of mysteries [16:18:23] @Tina: I thought so, but was doing too many different things at once to pay attention to the detail. Will have to go back later and look. [16:19:34] christophermah leaves the room [16:20:16] isidids and gold corals bioluminesce when disturbed [16:20:41] gold coral meaning the parazoanthid Kulamanamana [16:21:52] LAT : 35.220823 , LON : -58.034901 , DEPTH : 2719.1985 m, TEMP : 3.09766 C, SAL : 34.94747 PSU, DO : 8.03448 mg/l [16:22:21] it is so fluffy [16:23:28] vondawarehamhayes leaves the room [16:25:12] I will ask Anya [16:25:26] Sea cuke [16:25:59] Nice contrast of two echinoderms... [16:26:53] LAT : 35.22077 , LON : -58.034901 , DEPTH : 2717.4369 m, TEMP : 3.17435 C, SAL : 34.9505 PSU, DO : 8.03001 mg/l [16:27:22] I've seen sea cukes orient away from the substrate like this when they release gametes. But I'd expect that to be when there are several individuals. [16:28:01] If "something" ploops out, you'll know it is not the mouth. [16:28:19] :) [16:31:35] is it Zoantharia? [16:31:54] LAT : 35.220793 , LON : -58.035011 , DEPTH : 2711.7918 m, TEMP : 3.17974 C, SAL : 34.95023 PSU, DO : 8.07964 mg/l [16:32:06] spongivory by the snail? [16:32:10] What are the indiactors of erosion on FeMn crust? Is is chemically dissolution under certain conditions? [16:32:11] Don't see gastropods like this very often down here... [16:33:10] vondawarehamhayes leaves the room [16:34:03] haroldcarlson leaves the room [16:34:05] @Kevin almost always considered physical erosion. folks are interested in whether or not small changes in redox could cause reductive dissolution, but not a ton of evidence in modern settings. [16:34:41] we can have whole multi-million year horizons eroded, as well as growth hiatuses [16:35:01] Thanks! Always concerning when 2 mm could mean a couple million year hiatus. [16:35:18] Pierre Josso and his group have been working on confirming both of those episodes using laser ablation Pb isotope [16:36:08] a good reason to characterize a full seamount, among the many [16:36:54] LAT : 35.220839 , LON : -58.034981 , DEPTH : 2705.9307 m, TEMP : 3.15419 C, SAL : 34.94937 PSU, DO : 8.07501 mg/l [16:37:10] The biologists would be there with you Kira! [16:37:20] Yup! [16:37:41] King of the Hill bamboo coral! [16:38:06] slump scarp here? [16:40:15] quite snowing here [16:41:54] LAT : 35.220969 , LON : -58.035137 , DEPTH : 2700.4437 m, TEMP : 3.20265 C, SAL : 34.95581 PSU, DO : 8.04187 mg/l [16:42:21] another Heteropathes [16:43:32] or Bathypathes [16:43:41] can we zoom? [16:43:45] briefly [16:43:56] left already [16:44:09] and back! [16:44:12] Sorry Tina - we were pulled onto describing a map so I wasn't looking [16:44:18] and gone again! [16:44:30] seems Bathypathes [16:45:20] Terrestrially, such a steep mountainous slope covered with fallen rock fragments would be called 'scree' [16:45:43] Bassozetus sp? [16:46:15] Let's wait for Ken or Peter [16:46:25] eyes are here [16:46:34] haroldcarlson leaves the room [16:46:34] vondawarehamhayes leaves the room [16:46:41] Yes ... I'll go with that. Sigh ... not an assfish [16:46:55] LAT : 35.220933 , LON : -58.035118 , DEPTH : 2699.7306 m, TEMP : 3.16003 C, SAL : 34.95453 PSU, DO : 8.05436 mg/l [16:47:11] very long pelvic filaments [16:47:34] Sigh.... [16:47:43] Peter - the fish is the Ophidioid Eretmichthys, similar to Bassozetus, but with very elongated fin rays [16:48:15] thanks [16:48:47] not sure about this one but it is similar to the sponge you collected a few days ago [16:49:02] That's why I usually go with ophidiid and wait to look more carefully at the images. [16:49:11] Not even sure which class it is in [16:50:42] Peter and Ken: I didn't suggest Eretmichthys because it didn't have the elongated pectoral fins. But not all do and in fact it could be sexually dimorphic where those elongated fins are only seen on mailes [16:51:02] However that is pure speculation [16:51:21] Folded sponge may be Atlantisella sp, a euplectellid [16:51:29] I am a bit less conservative with IDs, making my best guess for future re-examination. Eretmichthys could be wrong, but is close - and directs me to revisit the image later on [16:51:56] LAT : 35.220988 , LON : -58.035181 , DEPTH : 2689.1908 m, TEMP : 3.20927 C, SAL : 34.95225 PSU, DO : 8.05077 mg/l [16:52:43] I do not know of any species of ophidioid in which there is sexual dimorphism in development of pelvic or pectoral fin rays. Typically, such elaborated rays are sensory in function, used for prey location, so useful to both sexes [16:53:49] Ok, thanks Ken [16:54:24] ooo !~~ starfish! [16:55:23] evoplosoma I think [16:55:25] aside from goniasterid Chris M., what is this? [16:55:39] usually a coral predator [16:55:52] Looking for its next coral to ravage [16:56:08] vondawarehamhayes leaves the room [16:56:10] still Goniasteridae? [16:56:42] These spiny sponges are probably glass sponges and probably in the family rossellidae [16:56:46] There may be sexual dimorphism indeed in the overall form of the paddle-like pectoral fin in Eretmichthys. Some individuals have a very long broad lower portion of the pectoral fin, but others do not. I have not been able to relate this to male vs female in examined specimens. It may be a matter of age/maturity [16:56:57] LAT : 35.220908 , LON : -58.035211 , DEPTH : 2685.5155 m, TEMP : 3.23755 C, SAL : 34.95431 PSU, DO : 8.07151 mg/l [16:57:04] haroldcarlson leaves the room [16:57:54] Ken, the pacific Eretmichthys pinnatus has a split pectoral fin with the lower part being much longer than the upper part [16:58:15] Good photos of that in the OER guide [16:58:36] still bamboo [16:58:40] bamboo? [16:59:08] polyps close up weird [17:00:22] Christopher - thanks. Today's fish looks like a juvenile, and it did not have such a long and/or divided pectoral fin. Could still be Bassozetus, but the pelvics seemed rather to elongate. [17:00:36] some of them red, sclerites; or these are gonads? [17:01:36] kelseyviator leaves the room [17:01:38] what is approximation of size? [17:01:44] Thanks Ken. it will be interesting to hear what you and Peter think when you get a better longer look at the video grabs of that fish [17:01:57] LAT : 35.22097 , LON : -58.03511 , DEPTH : 2684.5712 m, TEMP : 3.22582 C, SAL : 34.94939 PSU, DO : 8.03126 mg/l [17:03:30] more then 150 cm wide [17:04:56] bolosominae, a stalked euplectellid [17:05:02] Got to sign off. This seamount needs more fish, but those imaged were nifty - good camera work ROV crew!! [17:05:17] Thanks Ken - we'll keep an eye out! [17:05:24] emilycrum leaves the room [17:05:35] kensulak leaves the room [17:05:53] look at those pillows [17:06:58] LAT : 35.221041 , LON : -58.034945 , DEPTH : 2678.0455 m, TEMP : 3.22823 C, SAL : 34.95266 PSU, DO : 8.05495 mg/l [17:07:16] big chonelasma sp [17:07:28] hannahmiller leaves the room [17:08:12] @peterauster: in the planning call, you had mentioned a T transition near this depth. We have been hovering around 3.2 C since we started. do you expect it to change during the dive? [17:08:25] just curious! [17:08:27] That genus is in the family Euretidae, which are a "hard" sponge group [17:09:04] A thing of beauty, for sure [17:10:01] Looks like a nice soft pillow for a fish to lie its head on (even though I know it is not soft) [17:10:37] looks like eadible fish [17:10:51] Bassogigas would be my guess but I just can't remember if they have split pelvic filaments like bythidids. [17:11:58] LAT : 35.221139 , LON : -58.034997 , DEPTH : 2670.0792 m, TEMP : 3.22537 C, SAL : 34.95254 PSU, DO : 8.06199 mg/l [17:12:03] Ok, yes they do so Bassogigas would be my best guess [17:12:18] @scott, more like nice nest for smalle crab [17:13:30] not sure about that last sponge but its glass for sure [17:13:37] farreid [17:16:38] @chris - agree with Bassogigas [17:16:58] LAT : 35.22114 , LON : -58.035104 , DEPTH : 2652.2868 m, TEMP : 3.21875 C, SAL : 34.95243 PSU, DO : 8.06204 mg/l [17:17:22] vondawarehamhayes leaves the room [17:17:23] Thanks Peter [17:17:56] @kira - that 3 deg mark was a general trend by depth across the western N Atl basin ... so suspect temp will not change much over the short depth range we will ascend. [17:18:24] lobate flow structures. [17:18:53] @Peter: also think I am wrong about bythitids. They have a split lateral line but not split pelvic fin filaments. Got my splits mixed up [17:19:01] Looks like some flows detached and sloped downhill as a whole [17:19:06] speculative tho [17:19:31] christophermah leaves the room [17:20:39] Yes... Echinus [17:21:16] The lobate structures form from the lava quickly cooling upon eruption and forming a crust, then more lava that gets pumped into the flow goes beneath the crust and causes the lava to balloon up from inside [17:21:58] LAT : 35.221109 , LON : -58.035188 , DEPTH : 2649.1561 m, TEMP : 3.21886 C, SAL : 34.95307 PSU, DO : 8.02325 mg/l [17:24:41] I keep forgetting... the Corallium we are likely seeing has now been transferred to Hemicorallium (H. bathyrubrum) [17:26:02] Is it all hemicorallium? [17:26:59] LAT : 35.221139 , LON : -58.03529 , DEPTH : 2637.3652 m, TEMP : 3.2132 C, SAL : 34.95279 PSU, DO : 8.06023 mg/l [17:27:20] vondawarehamhayes leaves the room [17:27:37] I think so Rhian [17:28:03] The genuc Corallium is still valid and has at least 7 species. But they aren't the species we see in the deep North Atlantic, so I expect everything we have been seeing is Hemicorallium. [17:28:04] kimberlygalvez leaves the room [17:28:15] sponge appears to be a tretodictyid [17:28:41] Ah, the joys of taxonomy... [17:29:02] the cuc was probably a synallactid of some kind [17:29:15] THanks! I haven't kept up with my coralliums! [17:29:45] http://www.marinespecies.org/aphia.php?p=taxdetails&id=1311242 [17:29:54] Safest just to say Corallidae (the family level) [17:30:09] I guess this is that strange farreid [17:30:12] Hemicorallium is it is bathyrubrum [17:30:35] have trouble with video [17:30:58] peterauster leaves the room [17:31:59] LAT : 35.221184 , LON : -58.03528 , DEPTH : 2637.9104 m, TEMP : 3.2252 C, SAL : 34.95157 PSU, DO : 8.06426 mg/l [17:33:41] christophermah leaves the room [17:34:39] Uhhhhhh [17:35:09] vondawarehamhayes leaves the room [17:35:10] slit shell snail! [17:35:27] I think it is gastropod [17:36:22] I wonder if it is worth trying to slurp it? [17:36:26] don't say that too fast! [17:36:59] LAT : 35.221162 , LON : -58.035248 , DEPTH : 2635.5688 m, TEMP : 3.22223 C, SAL : 34.95509 PSU, DO : 8.07135 mg/l [17:37:03] We're going to try slurp it [17:37:12] deep sea rhomba [17:37:15] Great! [17:37:27] I concur. Great [17:37:57] I din't realize the feeding trace was going to be so interesting when I suggested a look! [17:38:09] Good eye Scott! [17:38:23] fascinating! [17:38:53] Is this in mucus envelope? [17:39:21] @Chris: ever seen anything like that? [17:39:26] Yes John, it has a wide muscous outer [17:40:09] I wonder if that is a transparent mantle extending around edge, or something else like a mucus envelope... [17:40:26] Awesome!!! [17:40:37] So exciting a collection. [17:41:40] @Scott, no, haven't seen any of those before [17:41:59] LAT : 35.221134 , LON : -58.035362 , DEPTH : 2636.2836 m, TEMP : 3.22206 C, SAL : 34.95242 PSU, DO : 8.05682 mg/l [17:42:06] Just to be clear... what group was that snail? I've heard the term "slit shell" but you don't mean a Pleurotamariidae? [17:42:52] interesting that there is a disconnected feeding trace... [17:42:55] @Chris: I threw out slit shell because there was a clear slot at the anterior end above the head. I know nothing of the taxonomy of this group of gastropods. [17:43:07] alternately could it be a Patellogastropoda that we imaged in the Marianas? [17:43:35] michaelvecchione leaves the room [17:43:38] And that had a question mark after it. Whatever it is, it was a great collection [17:43:43] Yes.. one of the weird limpet like gastropods... dare I even say... Neopilina like? [17:44:07] but not a pleurotamariid [17:44:09] I was told "probablement a fissurellidae genus Zeidora" [17:44:16]