Liralucina sperabilis ( Hedley, 1909 ), 2007

Liralucina sperabilis ( Hedley, 1909) View in CoL n. comb.

( Figs 25 View FIG ; 26A View FIG )

Phacoides sperabilis Hedley, 1909: 427 View in CoL , pl. 37, fig. 18.

Linga (Bellucina) sperabilis – Lamprell & Healy 1998: 254, fig. 777 (not fig. 778 as given).

Parvilucina cf. sperabilis – Zuschin & Oliver 2003: 108, pl. 25, figs 7-11.

TYPE MATERIAL. — Holotype: 1 LV, L 3.3 mm, H 3.1 mm ( AMS C.27565).

Probable paratypes: from type locality, 4 v ( BMNH 1910.928.72-6) .

TYPE LOCALITY. — Hope Islands , Queensland, Australia, 5-10 fathoms.

MATERIAL EXAMINED. — Koumac. 14 stn, 0-120 m, 268 v.

Touho. 12 stn, 6-60 m, 282 v, 16 live.

Chesterfield Islands. CHALCAL 1, stn DC 20, 19°12’S, 158°42’E, 67 m. — Stn DC 21, 19°18’S, 158°43’E, 73 m. — Stn DC 27, 19°17’S, 158°34’E, 67 m.

New Caledonia. LAGON, stn 25, secteur de Nouméa, 22°21’S, 166°27’E, 28 m, 1 v. — Stn 41, 22°19’S, 166°16’E, 28-46 m, 1 v. — Stn 42, 22°17’S, 166°17’E, 25 m, 2 v. — Stn 119, Île Ouen, Baie du Prony, 22°28’S, 166°46’E, 20 m, 1 v. — Stn 439, Atoll de Huon, 18°07’S, 162°55’E, 39 m, 28 v. — Stn 440, 18°05’S, 162°55’E, 39 m, 1 v. — Stn 503, 19°12’S, 163°29’E, 64 m, 2 v. — Stn 517, 19°09’S, 163°35’E, 42 m, 1 v. — Stn 575, Grand Récif Sud, 22°55’S, 166°59’E, 62 m, 1 v. — Stn 729, secteur de Canala, 21°19’S, 165°54’E, 42 m, 30 v. — Stn 830, secteur de Poindimie, 20°49’S, 165°19’E, 105 m, 2 v. — Stn 898, secteur de Puebo, 20°14’S, 164°27’E, 22 m, 1 v. — Stn 973, secteur de Poum, 20°24’S, 163°60’E, 27 m, 1 v. — Stn 1082, secteur des Belep, 19°55’S, 163°45’E, 34 m, 1 v. — Stn 1085, 19°50’S, 163°53’E, 33 m, 3 v. — Stn 1091, 19°48’S, 163°48’E, 38 m, 6 v. — Stn 1092, 19°50’S, 163°46’E, 37 m, 4 v. — Stn 1093, 19°53’S, 163°44’E, 37 m, 1 v. — Stn 1111, 19°42’S, 163°42’E, 38 m, 1 v. — Stn 1114, 19°38’S, 163°50’E, 43 m, 1 v. — Stn 1129, 19°29’S, 163°49’E, 40 m, 1 v. — Stn 1205, 19°42’S, 163°26’E, 38 m, 1 v. — Stn 1214, 19°50’S, 163°37’E, 29 m, 1 v. — Stn 1216, 19°50’S, 163°38’E, 30 m, 1 v.

BATHUS 1, stn DW 674, East coast, 20°49’S, 165°19’E, 105 m, 10 v.

DISTRIBUTION. — Red Sea ( Zuchsin & Oliver 2003) to northern Australia and New Caledonia.

DESCRIPTION

Small, white, H to 4.5 mm, L to 4.3 mm, subcircular (H/L 1.0), inflated (T/L 0.41).Umbones prominent. Sculpture of 18-20 radial ribs with broad interspaces. Ribs rounded in profile, occasionally dividing, crossed by regularly-spaced, fine commarginal lamellae; ribs less prominent posteriorly. Juvenile shell to 500 µm with commarginal lamellae only. Protoconch large (140 µm), rounded, PI (c. 90 µm) smooth, PII with faint growth increments. Lunule long, wide, and slightly asymmetric, right part larger. Ligament short, slightly inset. Hinge: LV with two cardinal teeth and large anterior and posterior lateral teeth and sockets; RV with one cardinal tooth and anterior and posterior lateral teeth. Anterior adductor scar short, rounded, slightly detached from pallial line; posterior scar oval. Pallial line continuous. Inner shell margin coarsely crenulate.

REMARKS

Lucina pulchella Lynge, 1909 (p. 173, 174, pl. III, figs 13-15) (see also Robba et al. 2002: 78, fig. 5), described from the Gulf of Thailand, is similar but the figure shows clearly dividing radial ribs.

Liralucina sperabilis n. comb. is most similar to L. vaubani n. sp. (see below) but differs in having fewer, more prominent and widely spaced radial ribs and the inner shell margin is much more coarsely crenulate. Liralucina craticula n. sp. and L. lifouina n. sp. (below) differ in having far more fine, closely spaced, radial ribs.