Relichna truncatula (Schepman, 1913)

Valdés, Ángel, 2008, Deep-sea “ cephalaspidean ” heterobranchs (Gastropoda) from the tropical southwest Pacific, Mémoires du Muséum national d'Histoire naturelle 196, pp. 587-792 : 762

publication ID

978-2-85653-614-8

persistent identifier

https://treatment.plazi.org/id/03D087B2-FF4B-BE81-FEE3-7766F286FA94

treatment provided by

Felipe

scientific name

Relichna truncatula (Schepman, 1913)
status

 

Relichna truncatula (Schepman, 1913)

Figs 85D, E, 89

Dinia truncatula Schepman, 1913: 471 , pl. 32, fig. 5.

TYPE MATERIAL. — One syntype ZMA 3.13 View Materials .126 .

TYPE LOCALITY. — Sulu Archipelago , Philippines, 05°43.5’N, 119°40’E, 522 m [ Siboga : stn 095] GoogleMaps .

MATERIAL EXAMINED. — Philippines. The type material. 168°42’E, 340 m, 1 dd .

New Caledonia proper. LAGON: stn 830, Secteur de Poindimié, Fiji. MUSORSTOM 10: stn DW 1334, Bligh Water, 16°51’S, 20°49’S, 165°19’E, 105-110 m, 42 dd. 178°14’E, 251-257 m, 1 dd (Figs 85 D, E).

Norfolk Ridge. SMIB 5: stn DW 90, Banc Aztèque, 22°19’S,

DISTRIBUTION. — Originally described from Indonesia (Schepman 1913). Material herein collected from Fiji, New Caledonia and the Philippines (Fig. 89), in 110-522 m.

DESCRIPTION. — Shell morphology. Length 6 mm, width 3 mm (largest specimen examined). Shell solid, oval, with nearly parallel sides, narrower posteriorly (Fig. 85D). Only 1 whorl visible, except for a small visible portion of the top of the spire. Apex rounded, deeply umbilicate (Fig. 85E), with the aperture lip rising from the right side. The aperture lip forms a rounded wing connected to the columellar margin. Anterior end of the shell rounded. Umbilicus narrow, partially covered by a columellar extension. Aperture long, wide anteriorly, narrowing at about 1/4 of its length. Columellar margin thickened with a conspicuous tooth. Sculpture of a number of inconspicuous spiral grooves covering the entire shell. Colour uniformly dirty white.

Anatomy. Unknown. All shells collected lacked soft parts.

REMARKS. — Schepman (1913) described Dinia truncatula based on 2 shells collected from the Sulu archipelago, Philippines. Examination of the remaining syntype of this species revealed that is it conspecific with the shells from Fiji and New Caledonia here examined .

The shells of Dinia truncatula resemble those of members of Relichna , described above, and the only feature that would suggest its inclusion in Diniatys Iredale, 1936 (the valid name for Dinia H. & A.Adams, 1854, which is preoccupied by Dinia Walker, 1854 [ Lepidoptera ]), is the presence of a conspicuous tooth on the columella, which is also present in several genera of Retusidae . This species is provisionally referred to Relichna pending anatomical information becoming available.

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Cephalaspidea

Family

Retusidae

Genus

Relichna

Loc

Relichna truncatula (Schepman, 1913)

Valdés, Ángel 2008
2008
Loc

Dinia truncatula

Schepman 1913: 471
1913