|
|
CERITHIOPSIDAE |
|
|
|
Socienna jacksonensis (Laseron, 1951) Description based solely on holotype): Shell medium in size for the family, broadly conical, spire weakly convex. Protoconch of 1½ 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) |
|
