Cyclochlamys multistriata (Linse, 2002)
LINSE, K. 2002. The shelled Magellanic Mollusca: with special reference to biogeography relations in the Southern Ocean. Theses zoologicae, 34: vii, 252 p., pls. 1-21. A. R. A. Ganter Verlag KG, Ruggell, Liechtenstein [p. 121, pl. 19, figs. 9.1.2, 21-24]
2002 Cyclopecten multistriatus Linse, 2002
K. Linse, 2002, plate 19.
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«Cyclopecten sp.2: Linse 1997: 51; Linse 1999: 404
Description: Valves minute (1.7 mm length, 1.8 mm in height), inequivalve, left
valve almost equilateral, thin, fragile, hyaline, white in colour. Right valve almost flat, dissoconch sculptured with very fine radial lines and fine growth lines; anterior ear with byssus groove, well developed byssal sinus, and 6-7 scaled radial ribs increasing in size towards sinus, posterior ear almost smooth (Fig. 9.1.2-21). Left valve inflated, dissoconch sculptured with numerous commarginal and more than 20 radial ribs, radials narrower on the ears (Fig. 9.1.2-22). Umbones more or less in the middle of straight dorsal margin. Anterior and posterior margins almost straight, ventral margin concave curved. Prodissoconch small, separated from dissoconch by a honeycomb-like pattern (Figs. 9.1.2-23, 24). Periostracum absent. Hinge narrow, toothless. Type material: Holotype ZMH 2843, 6 paratypes ZMH 2844 REM 67 ST.1213,
30 paratypes ZMH 2845 ST. 1178, 5 paratypes ZMH 2846 St. 1184, 40 paratypes ZMH 2848, Stn. 1206 Etymology: multistriatus – Latin. With numerous striae. Name refers to the shell structure.
Material examined: VH’94 St. 1200 (5 A, 279 S), St. 1213 (31 A, 348 S), St. 1221 (1 A), St. 1237 (1 A), St. 1253 (5 S), St. 1257 (5 S).
Additional material examined: C. gaussianus (Thiele, 1912): holotype, HUM 863084; Palliolum clathratum (Martens, 1881): holotype HUM 29083, P. notalis (Thiele, 1912): holotype HUM 63122.
Previous (distribution) records: Magellan region (Fig. 4.2-22); 25-103 m.
Fig. 4.2-22. Distribution and sample location of
Cyclopecten multistriatus sp. nov. Comparative remarks: Cyclopecten multistriatus sp. nov. can separated from the other Magellanic pectinids by following characters: 1) the minute size, 2) right valve flat, only left one convex, and 3) distinctive sculpture on both valves. The new species was compared with small sized Antarctic pectinids, with typespecimens of C. gaussianus, Palliolum chathratum, and P. notalis. C. multistriatus sp. nov. can be separated from gaussianus by the protoconch sculpture (gaussianus has a smooth one), from P. clathratum by a narrower radial and commarginal sculpture and less convex left valve in the latter species, and from P. notalis by its commarginal sculpture and the convex curvature in both valves.
Additionally Cyclopecten falklandica Dell, 1964 is figured (Pl. XX, Figs. 9.1.2-25, 26) and its distribution shown (Fig. 4.2-23).»
KATRIN LINSE, 2002
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