Micropecten Dijkstra & Maestrati, 2012
DIJKSTRA, H. H. & P. MAESTRATI. 2012. Pectinoidea (Mollusca, Bivalvia, Propeamussiidae, Cyclochlamydidae n. fam., Entoliidae and Pectinidae) from the Vanuatu Archipelago. Zoosystema, 34 (2): 389-408, fig. 1. [p. 396]
«Micropecten n. gen.
TYPE SPECIES. — Cyclochlamys plectofilum Oliver & Holmes, 2004. Recent, Rodrigues Island, Indian Ocean,
shallow water. INCLUDED SPECIES. -- Micropecten plectofilum (Oliver & Holmes, 2004) n. comb. and M. excuratus n. sp.
DIAGNOSIS. — Cyclochlamydidae n. fam. with an irregularly lattice-sculptured prodissoconch, conical on left valve and flattened on right valve; antimarginally sculptured valves, at least in late ontogeny, left valve also weakly commarginally sculptured or lacking; preradial stage of right valve with a simple outer layer of longitudinal and hexagonal microstructure. Byssal notch well developed; ctenolium lacking; internal disc riblets absent; hinge teeth and ridges lacking.
ETYMOLOGY. — A small pectinoid. Gender masculine.
REMARKS
Micropecten n. gen. is different from Cyclochlamy by the following morphological characters: – a rounded prodissoconch angle (obtuse in Cyclochlamys); – a lattice-sculptured prodissoconch on both valves (left valve antimarginal, right valve almost smooth in Cyclochlamys); – a simple outer layer of longitudinally hexagonal microstructure in preradial stage on the right valve (throughout right valve in Cyclochlamys); – and an antimarginal sculpture on the right valve (lacking in Cyclochlamys). Micropecten n. gen. also differs from Chlamydella by: – having a circular shape (more posteriorly oblique in Chlamydella), an antimarginal sculpture on both valves (smooth or commarginally sculptured on the left valve in Chlamydella); – a latticed sculptured conical left valve prodissoconch (weakly inflated and radially sculptured in Chlamydella); – a simple outer layer of longitudinally hexagonal microstructure in preradial stage on the right valve (throughout right valve in Chlamydella); – an antimarginal sculpture on the right valve (lacking in Cyclochlamys).» HENK H. DIJKSTRA & PHILIPPE MAESTRATI, 2012
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Cyclochlamys plectofilum n. sp; P. G. Oliver & A. M. Holmes, 2004, Cryptic bivalves with descriptions of new species from the Rodrigues lagoon, figures 60-65.
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