Fustiaria diaphana, Scarabino & Scarabino, 2010

Scarabino, Victor & Scarabino, Fabrizio, 2010, A new genus and thirteen new species of Scaphopoda (Mollusca) from the tropical Pacific Ocean, Zoosystema 32 (3), pp. 409-423 : 412-414

Fustiaria diaphana n. sp.

( Fig. 1 L-O)

TYPE MATERIAL. — Coral Sea. EBISCO, stn DW 2639, 20°47’S, 161°01’E, 289-294 m, 1 dd holotype ( MNHN 22778 ) ; 2 dd paratypes ( MNHN 22779 ) .

TYPE LOCALITY. — Coral Sea, south of Lansdowne Bank, 20°47’S, 161°01’W, 289-294 m ( EBISCO, stn DW 2639).

ETYMOLOGY. — The species epithet derives from the Greek, meaning translucent.

OTHER MATERIAL EXAMINED. — Coral Sea. EBISCO, stn DW 2639, 20°47’S, 161°01’E, 289-294 m, 14 dd.

DISTRIBUTION. — Coral Sea. Shells at 289- 294 m.

DESCRIPTION

Shell 35.3 mm long, well curved, translucent, very gradually tapering, smooth, growth lines noticeable, thick-walled for ¾ from apex becoming thin-walled and fragile towards the anterior aperture, cross section slightly laterally compressed throughout. Apical and anterior apertures straight, apical callus thick, walls oblique to lumen, ventral side exhibits a vertical

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series of V-shaped threads that continue for a short distance internally in the ventral axis of shell, visible because of the transparency of the shell. Lumen also laterally oval, internal wall extends outside, entire on dorsal side and fissured ventrally. Measurements of holotype: L 35.5, W 1.6-1.51, apex 1.23-1.10, arc 3.6 at 17 from apex.

REMARKS

Fustiaria diaphana n. sp. is characterized primarily by its almost parallel sides, resembling some species of Episiphon but clearly differing in the apex and apical callus. As no radular information is available, the allocation of the new species in Fustiaria must be considered tentative but here suggested given the similarity of the apical structure with Fustiaria langfordi (Habe, 1963) and F. vagina Scarabino, 1995 (see Scarabino 1995: fig. 88h, i). Young specimens show the apex slightly oblique, the dorsal side longer and a shallow notch in the ventral axis, resembling F. vagina apical morphology.

Family GADILINIDAE Chistikov, 1975