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Socienna jacksonensis (Laseron, 1951)

Description based solely on holotype): Shell medium in size for the family, broadly conical, spire weakly convex. Protoconch of 1 whorls, with distinct junction with teleoconch. Teleoconch of 8 moderately convex whorls; suture indistinct within deep groove. Whorls sculptured with 3 strong spiral cords with interspaces equal to width of cords. Spiral cords crossed by weaker axial ribs, forming more or less circular beads at intersections; about 16 axials on last whorl. Base with spiral 4 beaded, level with top of aperture, and a weaker, smooth spiral 5 below. Outer lip of aperture thin; inner lip without callous. Columella twisted, anterior canal oblique, a deep U-shaped notch. Shell colour mid-brown.

Size: Holotype 4.7 mm in length.

Distribution: Holotype locality: North Harbour, Port Jackson, Sydney, NSW. Additional specimens available (5 lots): Shelly Beach, Clarence River; Angourie; Fingal Head, Port Stephens; Middle Harbour.

Habitat: Specimens are from beach washup and among coralline algae intertidally.

Figs. 1, 2: North Harbour, Port Jackson (C.102753 HOLOTYPE)

 

Copyright Des Beechey 2016