Marine Institute
SeaRover Dive Video

D474 Transect 35 Mixed burrowing anemones, Acanella, pebbles/cobbles present in a couple of patches but urchins are dominant. Features: Unidentified Water Depth: 988-921 m

Highlights: Red shrimp Chimaera Sea fan

The substrate is mainly sandy featureless sediment while coarse ground with stones, pebbles and occasional rocks is more common where the incline is gentle. The predominant fauna are cerianthids and a pale pink anemone which occur in the sediment.

A red echinoid, echinoid sp. is recorded here for the first time in this survey. Galatheidae burrows are quite prominent in some areas. The hydrozoan Pliobothrus symmetricus is present on the rocks towards the top of the feature. Benthoctopus sp. is also recorded here.

START VIDEO A [00:00:00]/09:45 [1] The majority of this dive is spent on relatively flat muddy substrate. Burrowing cerianthid anemones are dominant, but holothurians, urchins, and asteroids are also abundant, along with larger burrowing anemones. The water is slightly cloudy. [00:10:00] ROV moves diagonally right. [00:11:00] ROV moves diagonally left. [00:12:00] ROV moves diagonally right. [00:13:00] ROV moving forwards. [00:24:00] [2] The mud and epifauna continue, now Acanella arbuscula is also frequent, along with sparse Xenophyophores (Syringammina fragilissima). [00:45:00] [3] Back to burrowing anemone dominated mud, Phormosoma placenta is more abundant here. [01:17:00]. sparse pebbles/cobbles but no major change in epifauna. [01:22:30]-[01:24:00] Stop for imagery of a single Acanthogorgia armata. [01:30:00] no more pebbles/cobbles and Zoroaster fulgens (robust morph) becomes abundant. [01:36:00] Z. fulgens no longer abundant. [01:54:00] [4] cobbles/pebbles denser than before, occasional Pliobothrus sp . or barnacles, but not in sufficient numbers to warrant biotope change. Urchins dominate, especially Phoromosoma placenta. END VIDEO A 11:46.

START VIDEO B [02:01:00]/11:48. Continued cobbles/pebbles. [02:09:00]. ROV moving left until [02:10:00]-[02:19:00] Sampling two pushcores. [02:21:00]-[02:23:00] stop for imagery. [02:28:00] [5] back to mud now dominated by urchins. END VIDEO B [02:31:00]/12:18.

Progression Start Duration Code Name
1[00:00:00]00:24:57M.AtLB.Mu.BurMegAtlantic lower bathyal mud (with burrowing megafauna)
4[00:00:00]02:01:17M.AtMB.Mu.UrcComUrchin dominated community on Atlantic mid bathyal mud
2[00:24:58]00:21:00M.AtMB.Mu.EreCor.AcaArbAcanella arbuscula assemblage on Atlantic mid bathyal mud
5[00:27:33]00:02:51M.AtMB.Mu.UrcComUrchin dominated community on Atlantic mid bathyal mud
3[00:45:59]01:08:40M.AtLB.Mu.BurMegAtlantic lower bathyal mud (with burrowing megafauna)

Unknown Hydrozoa or Annelida : 1027 : R
Foraminifera
Syringammina fragilissima : 261 : R
Porifera
Porifera encrusting sp. 1 (white) : 1 : R
Porifera lamellate lobose (fleshy) : 1132 : R
Cnidaria
Cerianthidae sp. 1 : 2 : F
Actiniaria sp. (large red) : 1120 : R
Actiniaria sp. 18 : 582 : O
Actiniaria sp. 20 : 605 : R
cf. Halcampoididae sp. : 984 : R
Sagartidae sp. (wide oral disc) : 1118 : O
Actiniidae sp. (sand Bolocera) : 41 : O
Halcampoididae sp. 1 : 23 : R
Phelliactis sp. 1 : 255 : O
Epizoanthus sp. 1 (Paguridae associated) : 317 : R
Acanthogorgia cf. armata : 608 : R
Acanella arbuscula : 585 : F
Pennatulacea (indet.) : 1114 : O
Pennatula aculeata : 1046 : R
Branchiocerianthus norvegicus : 1069 : O
Pliobothrus sp. : 207 : R

Arthropoda
Majidae sp. 1 : 11 : R
Munida tenuimana : 339 : R
Paguridae sp. : 205 : R
Caridea (indet.) : 1077 : R
Colossendeis sp. 1 : 1059 : R
Cirripedia sp. 1 : 82 : R
Mollusca
Opisthoteuthis extensa : 918 : R
Octopoda (indet.) : 659 : R
Teuthida sp. 1 : 1017 : O
Echinodermata
Crinoidea sp. : 1072 : R
Gorgonocephalus sp. 1 : 214 : O
Ophiuroidea sp. 7 - yellow : 340 : R
Zoroaster fulgens : 988 : F
Pseudarchaster sp. 1 : 433 : R
Echinidae sp. (white) : 559 : R
Hygrosoma sp. : 1125 : R
Phormosoma placenta : 555 : F
Spatangus raschi : 537 : R
Echinoidea sp. 1 : 279 : R
Benthogone sp. : 432 : F

Benthothuria sp. : 1124 : O
Chordata
Rajiformes sp. 1 (Neoraja caerulea?) : 652 : R
Hydrolagus cf. mirabilis : 1024 : O
Synaphobranchus kaupii : 440 : O
Molva macrophthalma : 1175 : O
Nezumia aequalis : 1003 : O
Coryphaenoides guentheri : 577 : O
Coryphaenoides rupestris : 566 : O
Trachyrincus sp. : 446 : R
Lepidion eques : 249 : O
Guttigadus latifrons : 1166 : R
Mora moro : 349 : O
Lophius piscatorius : 273 : R
Polyacanthonotus rissoanus : 552 : R
Notacanthidae sp. 1 : 1009 : R
cf. Rouleina attrita : 1074 : R
Zoarcidae sp. 1 : 259 : R
Actinopterygii sp. 3 : 930 : R

Number of species = 58

© Marine Institute, MERC Consultants, Bernard Picton 2022