PROPEAMUSSIIDAE  

Parvamussium formosum

(Melvill in Melvill & Standen, 1907)

Figure(s)

                                              

syntype (lv)

Original name   Amussium formosum Melvill in Melvill & Standen, 1907
Autoreference   Melvill in Melvill & Standen, 1907: 807, pl. 55, figs 7-7a.
Reference   Melvill, J.C. & Standen, R., 1907. The Mollusca of the Persian Gulf, Gulf of Oman and Arabian Sea as evidenced mainly through the collections of Mr F.W. Townsend, 1893-1906, with descriptions of new species, Part 2. Pelecypoda. - Proceedings of the Zoological Society of London 1906, 54: 783-848.
Type data

  Syntypes in The Natural History Museum, London (BMNH 1907.5.3.50) and the National Museum of Wales, Cardiff (NMW 1955.158.674). Several syntypes also deposited in other museums. Type locality: Persian Gulf, Gulf of Oman, 24*58'N, 56*54'E, 285 m, dead.

Description

  Shell up to ca. 10 mm high, fragile, semi-transparent, weakly inflated, subcircular, inequivalve, nearly equilateral, anterior auricles slightly larger than posterior, unequal in shape, internal ribs 8-11, sometimes with intercalated obsolete riblets near the ventral margin, umbonal angle ca. 95 degrees, colour whitish.

  Left valve with numerous closely spaced delicate radial riblets on anterior and posterior sides of the disc, on central part smooth. Laterally and ventrally sometimes with fine commarginal lamellae. Auricles with minute reticulated sculpture.

  Right valve smooth or with delicate commarginal lirae. Byssal notch shallow, byssal fasciole narrow, ctenolium lacking.

Distribution

 

E South Africa, Red Sea, Gulf of Aden, Arabian Sea, Gulf of Oman (TL), Persian Sea

Habitat  Probably living bathyally on soft bottom assemblages.