Volvulella multistriata, Valdés, 2008

Valdés, Ángel, 2008, Deep-sea “ cephalaspidean ” heterobranchs (Gastropoda) from the tropical southwest Pacific, Mémoires du Muséum national d'Histoire naturelle 196, pp. 587-792 : 752-753

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Volvulella multistriata

n. sp.

Volvulella multistriata n. sp.

Figs 81D, 83

TYPE MATERIAL. — Holotype MNHN 20427 and 3 paratypes MNHN 20428-20429, 2 paratypes LACM 3007 View Materials .

TYPE LOCALITY. — New Caledonia, 22°30’S, 166°24’E, 250-350 m [VAUBAN: stn 40] GoogleMaps .

MATERIAL EXAMINED. — New Caledonia proper. VAUBAN: 3007); stn DE 697, 20°34’S, 164°58’E, 570-650 m, 2 dd, pastn 40, 22°30’S, 166°24’E, 250-350 m, 1 dd, holotype ( MNHN ratypes ( MNHN 20428 View Materials ). — BATHUS 2 : stn CP 743, Passe de 20427; Fig. 81D) GoogleMaps . — BATHUS 1 : stn DE 696, Passe de Hien- Boulari, 22°36’S, 166°26’E, 713-950 m, 1 dd, paratype ( MNHN ghène, 20°34’S, 164°57’E, 497-520 m, 2 dd, paratypes ( LACM 20429 View Materials ). GoogleMaps

DISTRIBUTION. — Known only from New Caledonia (Fig. 83), in 350-713 m.

DESCRIPTION. — Shell morphology. Length 4 mm, width 1 mm (holotype). Shell fragile, elongate, with nearly parallel sides (Fig. 81D). Only 1 whorl visible, forming the entire shell. Anterior end of the shell rounded. Umbilicus closed. Aperture long, wide anteriorly, narrowing gradually at about 1/3-1/2 of its length. At its apical end, the aperture bends over the apex of the shell and the parietal wall forms a short spine that completely covers the apex. Columellar margin slightly twisted. Sculpture of numerous, faint and densely concentrated spiral grooves crossed by fine growth lines all over its surface. Colour uniformly shiny whitish.

Anatomy. Unknown. All shells collected lacked soft parts.

REMARKS. — Volvulella multistriata is similar in shell morphology to Volvulella radiola (A. Adams, 1862) from Japan, redescribed by Hori (2000c). The main differences between them include the sculpture, which is composed of densely arranged faint spiral grooves in V. multistriata and widely spaced grooves in V. radiola . In addition, the apical spine of V. radiola is much longer and more curved than that of V. multistriata , and the apical region of V. multistriata narrows more gradually than in V. radiola .

Another similar species is Volvulella tokunagai Makiyama, 1927 , which differs from V. multistriata in having a more gradually narrowing apical region and the spiral grooves widely spaced (see Hori 2000c).

ETYMOLOGY. — From the Latin for numerous striae, in reference to the sculpture of this species composed of densely arranged spiral grooves.


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