Parvamussium dautzenbergi ( Dijkstra, 1990 )

Dijkstra, Henk H. & Maestrati, Philippe, 2010, Pectinoidea (Mollusca, Bivalvia, Propeamussiidae, Entoliidae and Pectinidae) from the Austral Islands (French Polynesia), Zoosystema 32 (2), pp. 333-358 : 338

Parvamussium dautzenbergi ( Dijkstra, 1990) ( Fig. 2 F-J)

Propeamussium (Parvamussium) dautzenbergi Dijkstra, 1990: 2 , figs 5-8.

Parvamussium dautzenbergi – Dijkstra & Maestrati 2008: 87 [distribution]. — Tröndlé & Boutet 2009: 7 [listed from Austral Is].

MATERIAL EXAMINED. — Indonesia. Makassar Strait, 281 m, holotype lv ( ZMA Moll. 3.89.005).

Marotiri. BENTHAUS, stn DW 1884, 27°54’S, 143°33’W, 570-620 m, 4 lv. — Stn DW 1885, 27°52’S, 143°33’W, 700-800 m, 2 lv, 5 rv. — Stn DW 1887, 27°52’S, 143°33’W, 750-1000 m, 1 lv.

Banc Président Thiers. BENTHAUS, stn DW 1934, 24°41’S, 145°57’W, 560-1150 m, 1 lv.

Banc Arago. BENTHAUS, stn DW 1979, 23°22’S, 150°44’W, 176-340 m, 2 lv.

Rurutu. BENTHAUS, stn DW 1999, 22°25’S, 151°22’W, 270-500 m, 1 lv.

DISTRIBUTION. — Indonesian Archipelago and Solomon Islands ( Dijkstra & Maestrati 2008: 87). Depth range 281-655 m (dead). Austral Islands, only loose valves at 176-750 m depth.

REMARKS

The present specimens are similar to the type material. The radial riblets of the left valve are unevenly, widely spaced and more pronounced than the commarginal lamellae, which are microscopically closely spaced. External and internal sculpture is rather constant.

Figures

FIG. 2.— A-E, Parvamussium australanum n. sp.;A, B, holotype,external and internal views of the left valve;C, D, holotype,external and internal views of the right valve; E, details of the left valve; F-J, Parvamussium dautzenbergi (Dijkstra,1990); F, G, external and internal views of the left valve; H, I, external and internal views of the right valve; J, details of the left valve; K-P, Cyclopecten ambiguus n. sp.; K, L, holotype,external (SEM) and internal views of the left valve;M, N, external and internal views of the right valve;O, prodissoconch and early stage of the left valve (SEM); P, details of the left valve (SEM). Scale bars: O, 100 μm, P, 200 μm.