Weddelliopecten Kasum-Zade, 2003
KASUM-ZADE, A. A. 2003. Advance in research of mesozoic bivalve mollusks in Azerbaijan (Order Pectinoida: Revision and Systematics). 111 pp. Baku (in Russian; translated by Rosanne D’Aprile Johnson, VIARC, Smithsonian Institution).
«Genus Weddelliopecten Kasum-Zade gen. nov. [42]
Type species. Weddelliopecten antarctica Kasum-Zade sp. nov. [= Radulopecten sp. Doyle, Crame, Thomson, 1990, p. 443, pl. 1, figs. 6, 7, 9-11, Tithonian -? Berriasian of Antarctica.
Diagnosis. Shell is of rounded outline, almost equivalved, inequilateral, anterior margin is joined with lower one at angle, and posterior is outlined with latter by single enclosure {?}. Auricles unequal, anterior is larger than posterior. Sculpture is identical on both valves and represented by individual powerful triangular radial costae {ribs}.
Microsculpture consists of fine radial and concentric striae. Composition. Monotypic.
Comparison. It differs from Radulopecten Rollier, 1911 in having triangular radial costae {ribs}, which are identically developed on both valves, as well as in the configuration of the shell; from Pseudopecten Bayle, 1878, in having inequilateral shell and less well-developed byssal notch. In Sigmarinopecten Kasum-Zade gen. nov. auricles are raised slightly above hinge margin, and shell is almost equilateral.
Range. Tithonian – ?Berriasian of Antarctica.»
A. A. KASUM-ZADE, 2003
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Radulopecten sp; P. Doyle, J. A. Crame & M. R. A. Thompson, 1990, Late Jurassic - Early Cretaceus macrofossils from Leg 113, Hole 692 B, Eastem Weddell sea, plate 1.
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