Propeamussium investigatoris (Smith, 1906)

Dijkstra, Henk H. & Maestrati, Philippe, 2008, New species and new records of deep-water Pectinoidea (Bivalvia: Propeamussiidae, Entoliidae and Pectinidae) from the South Pacific, Mémoires du Muséum national d'Histoire naturelle 196, pp. 77-114 : 82

Propeamussium investigatoris (Smith, 1906)

Amussium investigatoris Smith, 1906: 255 .

MATERIAL EXAMINED. — The type material (see Dijkstra & 500 m, 7 spms; stn DW 1486, 19˚01’S, 178˚26’W, 395-540 m, Kastoro 1997: 250). 2 spms, 2 lv.

Solomon. SALOMON 1: stn CP 1792, 09°15’S, 160°09’E, 477- Tonga. BORDAU 2: stn DW 1520, 21˚25’S, 175˚03’W, 447- 505 m, 1 rv; stn CP 1795, 09°19’S, 160°23’E, 442-451 m, 1 rv; 450 m, 9 lv, 7 rv; stn CP 1528, 21˚14’S, 174˚59’W, 587-592 m, 8 stn CP 1805, 09°35’S, 160°43’E, 367-500 m, 1 spm; stn DW spms; stn CP 1529, 21˚13’S, 174˚58’W, 688-710 m, 2 spms; stn 1817, 09°48’S, 160°54’E, 233-269 m, 1 rv; stn CP 1836, 10°10’S, CP 1566, 21˚02’S, 175˚18’W, 530-531 m, 2 spms; stn DW 1617, 161°22’E, 439-486 m, 1 spm; stn CP 1837, 10°13’S, 161°29’E, 23˚03’S, 175˚53’W, 483-531 m, 2 lv; stn DW 1618, 24˚13’S, 381-383 m, 1 lv. 176˚18’W, 627-656 m, 1 lv; stn DW 1619, 24˚16’S, 176˚20’W,

Fiji. MUSORSTOM 10: stn DW 1315, 17˚16’S, 178˚24’E, 480- 591- 593 m, 1 lv; stn DW 1632, 22˚01’S, 175˚42’W, 613-618 m, 500 m, 2 lv, 1 rv; stn CP 1316, 17˚15’S, 178˚22’E, 478-491 m, 254 1 rv; stn DW 1637, 21˚05’S, 175˚23’W, 464-507 m, 1 spm, 6 lv, spms; stn CP 1317, 17˚12’S, 178˚14’E, 471-475 m, 8 spms; stn 6 rv; stn CP 1638, 21˚05’S, 175˚23’W, 469-520 m, 19 spms; stn CP 1330, 17˚10’S, 177˚56’E, 567-699 m, 9 spms; stn DW 1376, CP 1640, 21˚09’S, 175˚24’W, 564-569 m, 58 spms, 6 lv; stn CP 18˚19’S, 178˚09’E, 497-504 m, 1 lv. — BORDAU 1: stn CP 1420, 1641, 21˚09’S, 175˚22’W, 395 m, 2 spms; stn CP 1642, 21˚05’S, 17˚05’S, 178˚57’W, 550-687 m, 2 spms; stn DW 1432, 17˚20’S, 175˚23’W, 532 m, 44 spms, 7 lv, 9 rv; stn CP 1643, 21˚05’S, 178˚44’W, 477-493 m, 1 spm, 4 lv, 2 rv; stn CP 1461, 18˚09’S, 175˚22’W, 487 m, 2 spms; stn CP 1644, 21˚05’S, 175˚23’W, 178˚48’W, 560 m, 1 spm; stn CP 1462, 18˚09’S, 178˚44’W, 501 m, 6 spms, 3 lv, 1 rv.

556-560 m, 2 spms, 1 lv; stn CP 1468, 18˚16’S, 178˚41’W, 478-

DISTRIBUTION. — Northern Indian Ocean , Indonesia (Dijkstra & Kastoro 1997: 250), Chesterfield Islands, New Caledonia, Loyalty Islands, Norfolk Island and Kermadec Islands ( Dijkstra 2001: 76); live in 176-660 m. New records for the Solomon Islands, Fiji and Tonga. Present material live in 395-688 m.

REMARKS. — The present material is similar to the type specimens, although the radial sculpture on the left valve is somewhat weaker with fewer radial riblets in the present material. The present material has a few more internal ribs (12 and usually with 1-3 rudimentary interstitial riblets) than the type specimens (10 with 1 or 2 rudimentary interstitial riblets).