Cyclopecten erythraeensis Dijkstra & Janssen, 2013
DIJKSTRA, H. H. & A. W. JANSSEN. 2013. Bathyal and abyssal Pectinoidea from the Red Sea and Gulf of Aden (Bivalvia: Propeamussiidae, Entoliidae, Pectinidae). Archiv für Molluskenkunde, 142 (2) 181-214., figs. 1-57. [p. 197, figs. 26, 27]
2013 Cyclopecten erythraeensis Dijkstra & Janssen, 2013
H. H. Dijkstra & A. W. Janssen, 2013, figures 23-33.
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«Material examined: Red Sea: ‘Meteor 31’, stn 93.2, 1 v (SMF); Stn 93.4, 1 v (SMF); Stn 93.7, 2 v (SMF); Stn 95.5, 1 v (SMF).
Type material: Holotype (lv) SMF 341770, 4 paratypes (v): SMF 341771-341773. Type locality: ‘Meteor 31’, stn 95.5, Red Sea, near Abington Reef, 20°49.4' N, 37°21.6' E, 237 m, 23.II.1995. Description: Shell small, up to 3.6 mm high, opaque to semi-transparent, almost circular, inequivalve, equilateral, auricles subequal, umbonal angle 110°. Left valve sculptured with irregularly spaced, antimarginal spinose riblets, commencing 1 mm below umbo and increasing with secondary interstitial riblets, extending to ventral margin, crossed by closely spaced, very delicate commarginal intercalated lamellae. Preradial stage with fine commarginal sculpture. Anterior auricle with c. 12 prominent, widely spaced, commarginal spinose lirae and posterior auricle similar sculptured as shell disc. Colour whitish.
Dimensions holotype (lv): H 3.6 mm, W 3.8 mm. Distribution: So far Red Sea only. Remarks: So far only left valves of Cyclopecten erythraeensis have been collected. Cyclopecten horridus DIJKSTRA 1995, recorded from New Caledonia and the Loyalty Islands (435–735 m), differs from C. erythraeensis in having more widely spaced commarginal lamellae with erect spines and in lacking antimarginal sculpture on the left valve (see also DIJKSTRA 1995: figs 63–64, holotype C. horridus). Parvamussium carbaseum DIJKSTRA 1991, recorded from Indonesia (130–495 m) has identical commarginal sculpture of weak intercalated lamellae to that of the present species, but differs in having more antimarginal riblets, which are less spinose (see also DIJKSTRA 1991: figs 12–13). Also internal ribs are well-developed, but are lacking in C. erythraeensis. P. thyrideum, recorded from the same region as the present species, differs in having more widely spaced commarginal lamellae and more prominent antimarginal sculpture. Rudimentary internal riblets are developed that are absent in C. erythraeensis. Etymology: After the Red Sea.» HENK H. DIJKSTRA & ARIE W. JANSSEN, 2013
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