Basiliola beecheri ( Dall, 1895 )

Bitner, Maria Aleksandra, 2008, New data on the recent brachiopods from the Fiji and Wallis and Futuna islands, South-West Pacific, Zoosystema 30 (2), pp. 419-461 : 427

Basiliola beecheri ( Dall, 1895)

( Fig. 5 H-L)

Hemithyris beecheri Dall, 1895: 717 , pl. 31, figs 1-4.

Basiliola beecheri – Dall 1908: 442. — Cooper 1959: pls 11b, 14a. — Zezina 1985: 115. — Laurin 1997: 420, 421, figs 3, 4, 42 d-k. — Bitner 2006b: 17, fig. 1a-d.

MATERIAL EXAMINED. — Fiji. MUSORSTOM 10, Viti Levu, stn DW 1376, 1 complete specimen. BORDAU 1, Lau Ridge, stn CP 1394, 1 complete specimen, 1 ventral valve, 1 dorsal valve. — Stn DW 1408, 1 ventral valve. — Stn CP 1409, 1 complete specimen. — Stn CP 1412, 21 complete specimens, 1 ventral valve. — Stn DW 1432, 12 complete specimens, 1 dorsal valve. — Stn DW 1464, 1 complete young specimen.

DEPTH RANGE. — 285- 561 m.

MEASUREMENTS. — See Table 5.

REMARKS

Basiliola beecheri was already recorded from the Fiji region, but was represented by only two specimens and internal structures were not investigated ( Bitner 2006b). This medium-sized, strongly dorsibiconvex species has corrugated teeth supported by dental plates close to the valve wall.Its inner socket ridges are long. No cardinal process is present. The outer hinge plates are broad, and crura are of subfalciform type ( Fig. 5K, L ). The muscle scars are distinct. Basiliola beecheri can easily be distinguished from B. lucida by its larger size and much broader hinge plates.

Figures

FIG. 5. — A-G, Basiliola lucida (Gould, 1862), Fiji, Lau Ridge, BORDAU 1: A-D, ventral, dorsal, lateral and anterior views of complete specimen (MNHN BRA-3069), stn DW 1472, 262-266 m; E, SEM micrograph of inner view of ventral valve, posterior part (MNHN BRA-3070),stn CP 1469,314-377 m;F, G, SEM micrographs of posterior part of dorsal valve interior (MNHN BRA-3071), stn CP 1469, 314-377 m; H-L, Basiliola beecheri (Dall, 1895), Fiji, Lau Ridge; H-J, dorsal, lateral and anterior views of complete specimen (MNHN BRA-3072),stn CP 1412, 400-407 m; K, L, SEM micrographs of posterior part of dorsal valve interior (MNHN BRA-3073), stn CP 1394, 416 m. Scale bars:A-D, 0.5 cm; E-G, 1 mm; H-J, 1 cm; K, L, 2 mm.