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Plastiscala magna (Gatliff & Gabriel, 1910)

Description: Shell tall and slender, up to 11 teleoconch whorls. Protoconch of 1 smooth, inflated whorls, offset from teleoconch axis at about 20 degrees. Teleoconch whorls weakly convex, with 2-7 thin, low, irregularly spaced varices per whorl, with or without broad, low axial ribs. Ribs, when present, strong on early whorls, becoming progressively obsolete on latter whorls. Spiral sculpture of cords, 7 on penultimate whorl and 14 on last whorl. Aperture elongate oval, outer lip not thickened. Umbilicus closed. Colour white or white with brown patches on top half of whorls before varices.

Size: Up to 12.5 mm in length.

Distribution: Endemic to Australia; Sydney, NSW, around southern Australia to western Great Australian Bight, WA.

Habitat: Known from 5-183 m. Uncommon.

Comparison: See P. morchi.

Synonymy: Obstopalia lixa Iredale, 1936 is a synonym (NEW SYNONYM). It agrees in shell characters with the type figure and description of P. magna, and with the specimens on hand.

Fig. 1: SE of South West Cape, Tasmania, in 119 m (C.unreg)

Fig. 2: SYNTYPE of Obstopalia lixa. Off Green Cape, NSW, in 128 m (C.060650)


Copyright Des Beechey 2008