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An inferred phylogeny for molluscan classes that puts gastropods, bivalves, and scaphopods in a monophyletic group (Kocot, 2013) reduces the implied number of losses of a metatroch if a metatroch originated in the ancestor of that clade; but implied losses still outnumber gains because numerous clades within the Bivalvia and Gastropoda lack metatrochs.
In India, till today, 5070 species of mollusca have been recorded of which 3370 species are from marine habitats [49].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 [2, 51].
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 [55].
2000), and scaphopods (Wanninger & Haszprunar 2001) where the en gene has a conserved role in molluscan shell formation.
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.