Marine Institute
SeaRover Dive Video

D560 Transect PB18 Muddy sediment with scattered hard substrata. Sparse epifauna on rock including sponges. Priority 1. Feature: Ridge. Water depth: -2150 m. TL: 2.2 km SOL: 14° 31.160' W 50° 35.422' N

Highlights: Pink sea cucumber Giant hydroid - Branchiocerianthus Stalked crinoids Demosponge - Geodia sp. on boulder Octopus Antipatharian coral

Soft sediment with pebbles throughout the dive,drop stones frequent in places. Common species include echinoid urchins, xenophyopores and holothurians. Most species are found on or attached to stone/ hard substrate including stalked crinoids, encrusting sponges, serpulids, sponges and black corals. Species of interest include Stauropathes (sampled), the echiuran Bonellia viridis and an unknown, and potentially novel, giant hydroid.

START VIDEO [00:00:00]/05:43. [1] Sparse epifauna on mud and cobble fields mosaicked sediment. Occasional boulders. [00:12:00] ROV stops for imagery of sea cucumber OTU432. [00:15:00] ROV stops for imagery of Corymorphidae sp. [2] Muddy sediment and pebble fields with occasional boulders. Encrusting sponges OTU1 and solitary scleractinians OTU6 on rock. [00:17:00] [3] Carbonate boulder/bedrock. Stalked crinoids OTU1041 dominates on carbonate. [00:19:00] [4] Again muddy sediment and pebbles with scattered boulder/cobbles. Anemones OTU605 and scleractinians OTU6 on rock substrata. Ophiomusa lymani OTU551 on soft sediment. [00:23:00] ROV stops for imagery of unknown object. [00:27:00] ROV stops for imagery of boulder with Geodia cf. barretti OTU601. [00:49:00] Fairy rings recorded in this dive. [01:00:00] ROV stops for imagery and sampling of Stauropathes arctica OTU547. [01:01:00] [5] Here muddy sediment and gravel. Scattered encounters of Syringammina fragilissima OTU261. [01:07:00] ROV stops for sampling two pushcores. END VIDEO [01:48:00]/07:31.

Progression Start Duration Code Name
1[00:00:00]00:15:27M.AtLB.MuAtlantic lower bathyal mud
2[00:15:28]00:02:23M.AtLB.MuAtlantic lower bathyal mud
3[00:17:52]00:01:55M.AtLB.RoAtlantic lower bathyal rock and hard substrata
4[00:19:48]00:43:29M.AtLB.MuAtlantic lower bathyal mud
5[01:03:18]00:47:33M.AtLB.MuAtlantic lower bathyal mud

Foraminifera
Syringammina fragilissima : 261 : R
Porifera
cf. Geodia baretti (Porifera massive globose sp. 11) : 601 : R
Porifera encrusting sp. 1 (white) : 1 : R
Porifera encrusting sp. 14 : 52 : R
Porifera encrusting sp. 15 (yellow) : 58 : R
Porifera massive lobose sp. 21 (Hertwigia sp. ?) : 611 : R
Cnidaria
Cerianthidae sp. 1 : 2 : R
Actiniaria sp. 20 : 605 : R
cf. Halcampoididae sp. : 984 : R
Adamsia sp. : 1066 : R
Bathypathes sp. 1 : 328 : R
Bathypathes sp. 1 : 328 : R
Stauropathes arctica : 547 : R
Caryophyllia sp. 2 : 6 : R
Epizoanthus sp. 1 (Paguridae associated) : 317 : R
Anthomastus grandiflorus : 278 : R

Acanella arbuscula : 585 : R
Kophobelemnon stelliferum : 442 : R
Corymorpha sp. 2 : 1204 : R
Annelida
Aphroditidae sp. 1 : 146 : R
Serpulidae sp. 1 : 106 : R
Arthropoda
Paguridae sp. : 205 : R
Eucarida sp. (red deep) : 1138 : R
Mollusca
Muusoctopus johnsonianus : 1194 : R
Hypsogastropoda sp. : 621 : R
Echinodermata
Bathycrinidae sp. : 1141 : R
Anachalypsicrinus nefertiti : 1031 : R
Crinoidea sp. 1 : 131 : R
Ophiomusa lymani : 551 : R
Ophiuroidea (indet.) : 1076 : R
Ophiuroidea sp. 11 (red disc) : 1036 : R

Brisingidae sp. : 274 : R
cf. Henricia sp. (deep) : 1154 : R
Asteroidea sp. (pink deep sediment) : 1171 : R
cf. Echinus (deep pink spine) : 1129 : R
Hygrosoma sp. : 1125 : R
Phormosoma placenta : 555 : R
Echinoidea sp. 5 : 572 : R
cf. Benthogone sp. (white) : 574 : R
Benthogone sp. : 432 : R
Mesothuria intestinalis : 536 : R
Chordata
Ipnopidae sp. : 1078 : R
Nezumia aequalis : 1003 : R
Trachyrincus sp. : 446 : R
Polyacanthonotus rissoanus : 552 : R
Myxine glutinosa : 383 : R

Number of species = 46

© Marine Institute, MERC Consultants, Bernard Picton 2022