Austrodrillia agrestis

Austrodrillia agrestis is a species of sea snail, a marine gastropod mollusk in the family Horaiclavidae.

Austrodrillia agrestis
Original image of a shell of Austrodrillia agrestis
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Clade: Caenogastropoda
Clade: Hypsogastropoda
Clade: Neogastropoda
Superfamily: Conoidea
Family: Horaiclavidae
Genus: Austrodrillia
Species:
A. agrestis
Binomial name
Austrodrillia agrestis
(Verco, 1909)
Synonyms[1]

Drillia agrestis Verco, 1909

It was formerly included within the family Turridae.[1]

Description

The length of the attains 8.5 mm, its diameter 3 mm.

The solid, rugged shell has an elongate-fusiform shape. It contains ​7 1⁄2 whorls, including the protoconch of one whorl and a half, smooth, round, and blunt. The whorls on the spire are sloping, scarcely concave in the upper part, convex in the lower. The suture is distinct, with a narrow adpressed margin. The body whorl is concavely attenuated at the base. The aperture is obliquely oval and shortly contracted posteriorly. The siphonal canal is short, open and barely notched. The outer lip is sharp, slightly ascending at the suture. The posterior sinus is deep, rather narrow, separated from the suture by a distance equal to its width, then convex, with an anterior shallow sinus at the base of the siphonal canal. The inner lip is inconspicuous, applied, smooth, with a callosity at its junction with the outer lip. The sculpture of the first two whorls is closely, regularly, validly, axially costulate, the rest rudely ribbed in the anterior two-thirds. The ribs are oblique, rounded, rather wider than the interspaces, becoming less marked and more distant on the body whorl, and almost absent on the base, about 14 in the penultimate whorl. There are sublenticular accremental incisions. The spiral incisions ai'e deep, irregularly slightly wavy, about 8 in the penultimate whorl, and 20 in the body whorl, nearly equidistant, in places alternately fine and wide. The colour of the shell is uniform light-straw tint.[2]

Distribution

This marine species is endemic to Australia and occurs off South Australia.

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References
  1. Austrodrillia agrestis (Verco, 1909). Retrieved through: World Register of Marine Species on 4 April 2010.
  2. Verco, J.C. 1909. Notes on South Australian marine Mollusca with descriptions of new species. Part XII. Transactions of the Royal Society of South Australia 33: 293–342 (described as Drillia agrestis)
  • Hedley, C. 1922. A revision of the Australian Turridae. Records of the Australian Museum 13(6): 213–359, pls 42–56
  • Wells, F.E. 1990. Revision of the recent Australian Turridae referred to the genera Splendrillia and Austrodrillia. Journal of the Malacological Society of Australasia 11: 73–117
  • Wilson, B. 1994. Australian Marine Shells. Prosobranch Gastropods. Kallaroo, WA : Odyssey Publishing Vol. 2 370 pp.
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