Cyclopecten horridus Dijkstra, 1995

Dijkstra, H. H. & Maestrati, P., 2015, Pectinoidea (Bivalvia: Propeamussiidae and Cyclochlamydidae) from the southwestern Indian Ocean, African Invertebrates 56 (3), pp. 585-585 : 617-618

publication ID

https://doi.org/ 10.5733/afin.056.0307

persistent identifier

https://treatment.plazi.org/id/038B87FE-FF92-FFD6-38FC-38C901FCFA17

treatment provided by

Felipe

scientific name

Cyclopecten horridus Dijkstra, 1995
status

 

Cyclopecten horridus Dijkstra, 1995 View in CoL

Fig. 6H–I View Fig

Cyclopecten horridus Dijkstra, 1995: 41 View in CoL , figs 63–64, 98; Dijkstra & Marshall 1997: 87; 2008: 16, 12E –H,

13. Type locality: Loyalty Islands, 20°29'S 166°43'E, - 600 m, live, RV Alis, leg. P. Bouchet GoogleMaps , B.

Métivier & B. Richer de Forges-IRD, 16.02.1989 (MUSORSTOM 6, stn DW 420).

Description: Shell up to 6 mm in height, fragile, circular, inequivalve, almost equilateral, left valve more inflated than right valve, auricles nearlY equallY sized, umbonal angle 120°–125°, colour dull whitish. Prodissoconch 170 µm long. Left valve sculptured with regularly spaced commarginal lamellae, close-set in early growth stage, enlarging towards periphery. Prominent hemitubular scales on commarginal lamellae arranged in radial rows that multiplY bY intercalation (Dijkstra & Marshall 2008: figs 12E, 12H). Auricles similar sculptured and continuous with shell disc. Right valve with regularly arranged closely spaced commarginal lirae sculptured with delicate spines near ventral margin. Anterior auricle with 3 radial riblets and overrunning commarginal lamellae. Posterior auricle almost continuous with shell disc with commarginal lirae. Hinge line straight. Antero-dorsal margin with scales, squamae weakly on postero-dorsal margin. Byssal notch strongly developed.

Type material examined: Holotype, pr ( MNHN IM-2000-21163).

Other material examined: SOUTH AFRICA: Transkei : Off Whale Rock (32°01.3'S 29°19.3'E), - 150–200 m, dead, sponge rubble, NMDP stn M8, dredged RV Meiring Naudé, 20.vii.1982 ( NMSA E65 About NMSA ) GoogleMaps .

Distribution and habitat: New Caledonia, Loyalty Islands and Kermadec Ridge (Dijkstra & Marshall 2008: 16). Now also from off Transkei, South Africa (new record). Live at - 350– 600 m. Present specimens dead at - 150– 200 m.

Remarks: The present specimens are almost indistinguisable from the type material. The hemitubular scales on the commarginal lirae of the left valve are coarser and more widely spaced. However, intermediate variations are also observed from the southwestern Pacific (MNHN). Other morphological characters are similar.

Cyclopecten erythraeensis Dijkstra & Janssen, 2013 View in CoL , recently recorded from the Red Sea, differs from C. horridus View in CoL by having a more closely spaced and delicate commarginal sculpture on the left valve with finer and less-hemitubular scales.

MNHN

Museum National d'Histoire Naturelle

NMSA

KwaZulu-Natal Museum

Kingdom

Animalia

Phylum

Mollusca

Class

Bivalvia

Order

Pectinida

Family

Propeamussiidae

Genus

Cyclopecten

Loc

Cyclopecten horridus Dijkstra, 1995

Dijkstra, H. H. & Maestrati, P. 2015
2015
Loc

Cyclopecten horridus

DIJKSTRA, H. H. & MARSHALL, B. A. 1997: 87
1997
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