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Socienna quadrispiralis (Laseron, 1951)

Description (based on syntypes): Shell medium in size for  family, conical, moderately wide, spire very weakly convex. Protoconch of about 1½ whorls, with faint but distinct junction with teleoconch. Teleoconch of 7–8 convex whorls; suture distinct within deep groove. Whorls sculptured with 4 spiral cords of moderate strength with interspaces equal to width of cords. Axial ribs cross spiral cords forming more or less circular beads at intersections; about 24 axials on penultimate whorl, becoming obsolete on last half of last whorl. Last whorl with spiral 5 level with top of aperture. Base concave, with a smooth spiral 6 at top, then smooth below. Outer lip of aperture thin; inner lip with thin callous. Anterior canal a deep U-shaped notch. Shell translucent, pale brown.

Size: Larger syntype 4.5 mm in length.

Distribution: Syntypes locality: Yamba, NSW. Additional specimens available (1 lot): Ulladulla, NSW.

Habitat: Available specimens are from beach washup.

Comparison: This is like C. alternata in shape, but there are 4 spirals per whorl, and the protoconch is shorter—1½ whorls in C. quadrispiralis, 4 whorls in C. alternata.

Figs. 1, 2: Yamba, NSW (C.102750 SYNTYPE)


Copyright Des Beechey 2016