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4998-1.jpg (64138 bytes)

 

 

Pisinna paucirugosa Ponder & Yoo, 1976

Description: Shell large for genus, solid, spire moderately convex in outline. Protoconch of 1 whorls, sculptured with spiral rows of minute pits, with distinct junction with teleoconch. Teleoconch up to 4 slightly convex whorls, slightly turreted, suture widely grooved on last whorl. Whorls smooth, or with weak, close, oblique, blunt axial riblets. Aperture almost circular, thickened internally, with very weak, broad varix externally. Colour pale reddish purple with broad white band below suture, base and aperture white; whole shell usually faded to white.

Size: Up to 5.2 mm in length.

Distribution: Endemic to Australia: Cape Moreton, Queensland, southwards to Moruya, southern NSW.

Habitat: "On the continental shelf, 20-150 m" (Ponder & Yoo, 1976). Uncommon.

Comparison: This is a similar to P. nitida in being a relatively large, continental shelf species, but has a wider shell with weak oblique axial sculpture. Also see Comparison of Pisinna species

Synonymy: None.

Remarks: The specific name of this species and its original description and figure suggests surface sculpture of a few weak axial riblets, but in the majority of specimens these are so faint and irregular as to be more appropriately described as weak growth ridges. They are not visible in the figure of the holotype here (Fig. 1).

Fig. 1: 4998-1 HOLOTYPE 115 m, NE of Cape Moreton Lighthouse, Queensland (C.95035) (Photo Australian Museum)

 

Copyright Des Beechey 2010. Modified 2014