Clionella subcontracta

Clionella subcontracta is a species of sea snail, a marine gastropod mollusk in the family Clavatulidae.[1][2]

Clionella subcontracta
Original drawing of a shell of Clionella subcontracta
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Clade: Caenogastropoda
Clade: Hypsogastropoda
Clade: Neogastropoda
Superfamily: Conoidea
Family: Clavatulidae
Genus: Clionella
Species:
C. subcontracta
Binomial name
Clionella subcontracta
(E.A. Smith, 1904)
Synonyms[1]
  • Drillia subcontracta Smith E. A., 1904
  • Mangilia nereia Turton, W.H., 1932

Description

The size of an adult shell varies between 8 mm and 1 mm.

The dark yellowish-brown shell is elongate but has a narrow base. It contains eight whorls; the first two are convex, the others concave on top, convex below. The whorls are thus strongly constricted below the suture. The suboval aperture measures about ⅓ the total length of the shell. The body whorl is well rounded at the middle and then contracted below. The almost straight axial ribs number 13–16 per whorl. A spiral striation or groove at the periphery, which also winds up the spire just above the suture, is usually more strongly marked than the rest. The siphonal canal is not notched.[3]

The characteristics of the shell - the small size, the glossy brown shell and the lack of variation - make Clionellla subcontracta an atypical species within the genus Clionella.

Distribution

This marine species occurs off Namaqualand to Port Alfred, South Africa.

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References
  1. Clionella subcontracta (E.A. Smith, 1904). Retrieved through: World Register of Marine Species on 4 April 2010.
  2. P. Bouchet; Yu. I. Kantor; A. Sysoev; N. Puillandre (2011). "A new operational classification of the Conoidea (Gastropoda)". Journal of Molluscan Studies. 77 (3): 273–308. doi:10.1093/mollus/eyr017.
  3. Smith, E. A. 1904. On a collection of marine shells from Port Alfred, Cape Colony. 1. Malac. 11 (2): 21-44 (described as Drillia subcontracta)
  • Kilburn, R.N. (1985). Turridae (Mollusca: Gastropoda) of southern Africa and Mozambique. Part 2. Subfamily Clavatulinae. Ann. Natal Mus. 26(2), 417–470.
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