Marine Institute
SeaRover Dive Video

D660 Transect 36 Steep slope with occasional large cobbles/boulders with a few epifauna. A colony of sparse Solenosmilia variabilis is encountered living on rock. P2. Water depth: 1793m.Feature: Slope

Highlights: Sea pen - Umbellula Cup coral Plastic litter Sea pen Octocoral

Of note: Corals.

The seafloor is initially fine sediment with little visible fauna. Upslope there are occasional drop stones and more prevalent rocky outcrops. At the top of the slope, the seafloor is again soft sediment. Initially the fauna consists of cup corals and a few cerianthids with a lot of medusae in the water column. Rocks are populated with starfish and the holothurian Psolus sp., sponges and the anemone Actinernus michaelsarsi. Occasional black corals are present including Stauropathes, Bathypathes, and Stichopathes. On the soft sediment there are several species of holothurians including Benthogone and Mesothuria, the crinoid Pentametrocrinus and ophiuroids. The stone coral Solenosmilia variabilis is present on a large rock. Towards the end of the dive, some pink corals are observed (probably Chrysogorgia sp.) and a single nephtheid coral (possibly Gersemia sp.).

START VIDEO [00:00:00]/19:10. Steep slope with occasional large cobbles/boulders with a few epifauna. A colony of sparse Solenosmilia variabilis is encountered living on rock . [1] [00:01:00] ROV lands on muddy slope with scarce epifauna including holothurians. ROV stops for sampling for two pushcores. [00:06:00] Rubbish (blue plastic sheet. [00:19:00] ROV stops for imagery and sampling of solitary sclearactinian (poss Flabellum). [00:42:00] large cobble/boulder hosts Phelliactis sp. and ophiuroids with two plastic sheets next to the boulder. [00:43:00] [2] Substrata is now mud with occasional boulders inhabited by various species, including Phelliactis sp1, encrusting sponges, holothurians and Umbellula sp. . [00:48:00] plastic bottle close to large cobble. [00:55:00] [3] Boulders and mud host holothurians, in particular Mesothuria intestinalis. [01:07:00] [4] substrata is now mud/gravel and pebbles, hosting no dominant species. [01:39:00] ROV stops for imagery of Clavulariidae. [01:43:00] glass bottle. END VIDEO [01:49:00]/21:01.

Progression Start Duration Code Name
1[00:00:00]00:43:24M.AtLB.MuAtlantic lower bathyal mud
2[00:43:25]00:11:34M.AtLB.MuAtlantic lower bathyal mud
3[00:55:00]00:12:41M.AtLB.RoAtlantic lower bathyal rock and hard substrata
4[01:07:42]00:18:49M.AtLB.MuAtlantic lower bathyal mud
5[01:26:32]00:22:47M.AtLB.MuAtlantic lower bathyal mud

Porifera
Hyalonema sp. 1 : 917 : R
Porifera encrusting sp. 1 (white) : 1 : R
Porifera lamellate (bubbles) : 1156 : R
Porifera massive lobose sp. 32 : 1090 : R
Cnidaria
Cerianthidae sp. 1 : 2 : F
Actiniaria sp. 20 : 605 : R
cf. Halcampoididae sp. : 984 : R
Sagartidae sp. (wide oral disc) : 1118 : R
Actinernus michaelsarsi : 554 : R
Actinostolidae sp. 1 : 132 : R
Phelliactis sp. 1 : 255 : R
Leiopathes sp. : 305 : R
Bathypathes sp. 2 : 561 : R
Caryophyllia sp. 5 (bullseye) : 584 : R
Solenosmilia variabilis : 700 : R

Flabellum sp. : 1056 : O
cf. Clavulariidae sp. : 289 : R
Pennatula inflata : 1183 : R
Umbellula sp. : 581 : R
Arthropoda
Colossendeis sp. 1 : 1059 : R
Mollusca
Hypsogastropoda sp. : 621 : R
Echinodermata
Pentametrocrinus atlanticus : 436 : R
Ophiomusa lymani : 551 : R
Ophiuroidea sp. 1 : 26 : R
Zoroaster fulgens : 988 : R
Solaster endeca : 573 : R
Pterasteridae sp. : 1115 : O
Hygrosoma sp. : 1125 : R
Echinoidea sp. 5 : 572 : R

cf. Psolus sp. : 1049 : R
Benthogone sp. : 432 : R
Benthogone sp. : 432 : R
Mesothuria intestinalis : 536 : F
Holothuroidea sp. (pink deep) : 1179 : R
Chordata
Synaphobranchus kaupii : 440 : R
Ipnopidae sp. : 1078 : R
Coryphaenoides rupestris : 566 : R
Trachyrincus sp. : 446 : R
Polyacanthonotus rissoanus : 552 : R
Notacanthiformes sp. 1 : 1012 : R
cf. Rouleina attrita : 1074 : R

Number of species = 41

© Marine Institute, MERC Consultants, Bernard Picton 2022