Parvamussium scitulum (E. A. Smith, 1885 )

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 : 339

Parvamussium scitulum (E. A. Smith, 1885)

Amussium scitulum E. A. Smith, 1885: 312 , pl. 23, figs 4-4b. Parvamussium scitulum – Dijkstra 1995a: 31, figs 43-46, 153-154 [synonymy, references, type data, distribution, description].

MATERIAL EXAMINED. — New Guinea. South, 51 m, lectotype lv (BMNH 1887.2.9.3319/1, designated by Dijkstra [1995a: 31]).

Marotiri. BENTHAUS, stn DW 1886, 27°51’S, 143°32’W, 620-1000 m, 1 lv.

Banc Lotus. BENTHAUS, stn DW 1952, 23°49’S, 147°53’W, 300-372 m, 1 rv.

Tubuai. BENTHAUS, stn DW 1957, 23°19’S, 149°29’W, 558-1000 m, 1 lv.

Banc Arago. BENTHAUS, stn DW 1973, 23°24’S, 150°44’W, 200-350 m, 1 lv, 1 rv.

Rurutu. BENTHAUS, stn DW 1999, 22°25’S, 151°22’W, 270-500 m, 1 lv, 2 rv. — Stn DW 2003, 22°28’S, 151°19’W, 250-330 m, 1 lv, 1 rv.

DISTRIBUTION. — Western and southwestern Pacific from southern Japan to New Caledonia, Loyalty Islands, Tonga and Wallis and Futuna (Dijkstra 2001: 86; Dijkstra & Maestrati 2008: 94). Depth range 50-300 m (alive). Now also Austral Islands (new record), only single valves at 200-620 m depth.

REMARKS

The present specimens are similar to the type material, although larger in size (up to 10 mm high), but Smith (1885) already reported that the type material could be juveniles ( Dijkstra 1995a: 32); they also have more numerous internal ribs (up to 16 and 2 or 3 rudimentary, vs 9 or 10 in the type material). Other characters are identical.