Marine molluscs dredged on the continental shelf of Axel Heiberg Island during cruises 85200 and 86200 of the Atlantic Geoscie nce Centre, Natural Resources Canada, Bedford Institute of Oceanography; (B) bivalve, (G) gastropod, (S) scaphopod
. Cruise Station [degrees]N [degrees]W Depth Lat.
In India, till today, 5070 species of mollusca have been recorded of which 3370 species are from marine habitats .Molluscs frommarine habitat of India, belonging to 220 families and 591 genera, of which 1900 are gastropods, 1100 are bivalves, 210 are cephalopods, 41 are polyplacophores and 20 are scaphopods
Molluscs from marine habitat of India, belonging to 220 families and 591 genera, of which 1900 are gastropods, 1100 are bivalves, 210 are cephalopods, 41 are polyplacophores and 20 are scaphopods
In the deepest block (I) surficial sediments were classified as Globigerina clay devoid of an oxidized layer, whilst the adjacent block (II) contained an assorted biogenic hemipelagic biota (foraminifera, pteropods, scaphopods
, micromolluscs, and echinoid and sponge spicules) and a discrete oxidized layer.
Potential trace-makers proposed for Protovirgularia include crabs (Gumbel, 1879), annelids or arthropods (Richter, 1941; Volk, 1961; Claus, 1965; Greiner, 1972), scaphopods
(Seilacher and Seilacher, 1994), and bivalves (e.g., Hakes, 1977; Han and Pickerill, 1994; Seilacher and Seilacher, 1994, Mangano et al., 1998).
2000), and scaphopods
(Wanninger & Haszprunar 2001) where the en gene has a conserved role in molluscan shell formation.
The macrofauna is mainly represented by hexactinellid and lithistid sponges, scleractinian corals, bryozoans, brachiopods, tube-dwelling polychaetes, molluscs (gastropods, bivalves, cephalopods--nautiloids--and scaphopods
), arthropods (crab claw fragments), echinoderms (crinoid stalk fragments, plates--ossicles--of asteroids, and spines and test fragments of echinoids), shark teeth, turtle plates, as well as sirenian vertebrae and ribs (Figs.