PECTINIDAE

Hyalopecten arntzi

Egorova, 1999

Figures

 

lv                                                      rv

Holotype (figured)

Original name   Hyalopecten arntzi Egorova, 1999
Autoreference   Egorova, 1999: 164, figs 1a-b, 3a.
Reference   Egorova, E.N., 1999. New and rare species of deep-sea scallops (Bivalvia, Pectinidae) in Recent Antarctic collections. - Zoological Journal (of the Russian Academy of Sciences, Moscow) 78(2): 164-169, 3 figs. [in Russian]
Type data   Figured holotype (pr: H 10.9 mm, L 10.2 mm, D 4.0 mm) Zoological Institute, St. Petersburg (ZIN RAS). Type locality: Antarctic, Weddell Sea, N of Atka Bay, 70*05.30'S, 08*20.00'W, 2315 m, alive, gravelly sand, 02.iii.1996 (ANT XIII/3 (EASIZ I) RV "Polarstern" stn 30 - DR24).
Description

  Shell up to ca. 11 mm high, thin, semi-transparent, higher than long, inflated, slightly oblique, commarginally undulated, left valve convex, right valve flattened, inequivalve, inequilateral, anterior auricle longer than posterior, unequal in shape, umbonal angle ca. 90 degrees, colour whitish.

  Left valve with wide spaced commarginal lirae and numerous irregularly and closely-set overrunning radial threads.

  Right valve with similar sculpture, commarginal lirae broader and radial scupture more obsolete. Auricles with delicate radial sculpture.

Byssal notch deep, byssal fasciole rather broad, functional ctenolium present.

Distribution

 

Antarctic, Weddell Sea (TL)

Habitat   Living abyssally on soft bottom assemblages.