Basiliola Dall, 1908

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

Genus Basiliola Dall, 1908

TYPE SPECIES. — Hemithyris beecheri Dall, 1895 , by original designation ( Dall 1908: 442).

Basiliola lucida ( Gould, 1862) ( Fig. 5 A-G)

Rhynchonella lucida Gould, 1862: 120 .

Neohemithyris lucida – Yabe & Hatai 1934a: 587. — Hatai 1940: 210, pl. 1, fig. 44; pl. 6, figs 106, 107.

Basiliola lucida – Cooper 1959: 27, pl. 13, figs 6-23. — Zezina 1985: 115. — Laurin 1997: 419, figs 1a-c, 2a-e, 42a-c.

MATERIAL EXAMINED. — Fiji. BORDAU 1, Lau Ridge, stn DW 1469, 58 complete specimens, 6 ventral valves, 6 dorsal valves. — Stn DW 1472, 3 complete specimens.— Stn DW 1497, 2 complete specimens. — Stn CP 1506, 1 complete specimen.

DEPTH RANGE. — 262- 377 m.

MEASUREMENTS. — See Table 4.

REMARKS

Basiliola lucida is an easily recognisable basiliolid species by its small size and elongate outline ( Hatai 1940; Cooper 1959; Laurin 1997). The shell is smooth with indistinct growth lines, dorsibiconvex and strongly uniplicate. The foramen is small, submesothyrid; deltidial plates conjunct. The teeth are short but wide, corrugated, while the dental sockets are deep with grooves corresponding to those on the teeth. The dorsal interior has subfalciform crura distally serrate and narrow outer hinge plates. No cardinal process is present.

Basiliola lucida differs from B. beecheri in smaller size and much narrower hinge plates.

Basiliola roddai Cooper, 1978 from the Pliocene- Pleistocene deposits of Fiji is very close to B. lucida . It differs in being more strongly and narrowly uniplicate and in having a more convex dorsal valve ( Cooper 1978).

This is the first record of this species from the Fiji region, from the Lau Ridge.

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.