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Seila halligani (Hedley, 1905)

Description: Shell medium size for the family, narrowly conical, spire weakly convex in outline. Protoconch of 3 smooth, strongly convex whorls. Teleoconch whorls sculptured with 3 strong, smooth spiral cords with a fourth spiral developing above suture on 7th whorl; interspace between spirals 2 and 3 wider than between 1 and 2; fine axial threads between spirals 2 and 3. Base with spiral 4 of same strength as spiral 1-3, smooth below. Outer lip of aperture apparently thin (broken in holotype); inner lip heavily calloused. Anterior canal a deep U-shaped notch. Colour white.

Size: Holotype 5.6 mm in length.

Distribution: Holotype from 12.5 miles east of Cape Byron, in 111 fathoms (203 m). Other material available (1 lot): south of Macquarie Harbour, Tasmania, in 88 m.

Habitat: Subtidal. Rare.

Comparison: See S. atkinsoni for comparison within the genus Siela. This species should not be confused with Cingulina spina, in the Pyramidellidae. The size, colour, shape and sculpture are generally similar, but C. spina has the typical heterostrophic protoconch of the Pyramidellidae, and the aperture lacks an anterior canal.

Figs. 1, 2: 12.5 miles east of Cape Byron, NSW, in 111 fathoms (203 m) (C.019876 HOLOTYPE)


Copyright Des Beechey 2016