Marine Institute
SeaRover Dive Video

D655 Transect 42 Muddy slope with scarce epifauna. Excellent imagery of Pennatulacea and Hyalonema. P2. Water depth: 1735m. Features: Slope

Highlights: Close-up of sea pen polyps Hexactinellid sponge - Hyalonema with zoanthid anemones on stalk

A lot of marine snow over a very muddy, steep slope. Two Hyalonema sponges are observed, and one was sampled for zooanthids. Fauna are generally scarce and include seapens, cerianthids and occasional small sea stars. Fish (also scarce) include eels, grenadiers, some orange roughy and a cartilaginous fish.

START VIDEO [00:00:00]/08:21. Muddy slope with scarce epifauna. Excellent imagery of Pennatulacea and Hyalonema. [1] The entire dive is characterized by muddy slope with few epifauna. [00:01:00] ROV tests the seafloor for potential core sampling. [00:03:00] ROV stops for sampling two pushcores. [00:17:00] Here a few boulders with no epifauna. [00:37:00] Muddy upslope/very steep slope with scarce epifauna. [00:56:00] ROV stops for imagery of Kophobelemnon stelliferum. [01:17:26] ROV stops for imagery and sampling of Hyalonema sp. with brown zoanthids on its stem. [01:27:00] Muddy down slope with scarce epifauna. END VIDEO [01:30:00]/09:49.

Progression Start Duration Code Name
1[00:00:01]23:59:59M.AtLB.MuAtlantic lower bathyal mud

Porifera
Hyalonema sp. 1 : 917 : R
Cnidaria
Cerianthidae sp. 1 : 2 : R
Actiniaria sp. 20 : 605 : R
cf. Halcampoididae sp. : 984 : R
Paramuricea sp. : 1050 : R
Kophobelemnon stelliferum : 442 : R
Umbellula sp. : 581 : R
Arthropoda

Colossendeis sp. 1 : 1059 : R
Echinodermata
Euryalida sp. : 1307 : R
Chordata
Galeus melastomus : 1005 : R
Synaphobranchus kaupii : 440 : R
Ipnopidae sp. : 1078 : R
Hoplostethus atlantica : 651 : R
Coryphaenoides rupestris : 566 : R
Trachyrincus sp. : 446 : R

Antimora sp. : 1301 : R
Polyacanthonotus rissoanus : 552 : R
Notacanthiformes sp. 1 : 1012 : R

Number of species = 18

© Marine Institute, MERC Consultants, Bernard Picton 2022