Sibogasyrinx

Sibogasyrinx
Shells of Sibogasyrinx pyramidalis
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Neogastropoda
Superfamily: Conoidea
Family: Cochlespiridae
Genus: Sibogasyrinx
Powell, 1969
Type species
Surcula pyramidalis
Schepman, 1913
Synonyms
  • Leucosyrinx (Sibogasyrinx) Powell, 1969
  • Schepmania Shuto, 1970 Invalid: junior homonym of Schepmania F. Haas, 1910 [Bivalvia]; Shutonia is a replacement name)
  • Shutonia van der Bijl, 1993 junior subjective synonym

Sibogasyrinx is a genus of sea snails, marine gastropod mollusks in the family Cochlespiridae.

Taxonomy

In shell characters Sibogasyrinx strongly resembles three distantly-related genera, two of which, Comitas and Leucosyrinx, belong to a different family, the Pseudomelatomidae. Previously it was considered a subgenus of Leucosyrinx Dall, 1889 at that time assigned to the Cochlespiridae (Powell 1966; Taylor et al. 1993)

Species of Sibogasyrinx are unique among the superfamily Conoidea on account of the high intrageneric variability in radular morphology, typical of Cochlespiridae – with paired marginal and well-defined central teeth. Three distinct radula types are found within Sibogasyrinx

Many species are known from a very limited number of specimens, and their interspecific and intraspecific variability has not been evaluated.

General characteristics

The shell is small to large, with adult specimens ranging from 27 to 65 mm in length. It is narrowly fusiform and only rarely pagodiform, and bears a concave to nearly flat subsutural ramp. Spiral sculpture is always present below the shoulder and is variously developed, consisting of narrow, close‑set cords that may also extend onto the subsutural ramp. The shoulder carries a row of strong nodules, although these often become obsolete on the body whorl.

The venom gland does not pass through the nerve ring, but instead opens into the oesophagus either within or just posterior to the nerve ring. The radula usually bears a central tooth, which is lacking in one species, and the marginal teeth show variable morphology, being folded longitudinally.

Distribution

Presently, species of Sibogasyrinx are known only from the central West Pacific – from the South China Sea and the Philippines to Indonesia (type species, Sibogasyrinx pyramidalis) and south to Vanuatu, New Caledonia and Australia.

Species

Species within the genus Sibogasyrinx include:

Synonyms

References

  1. 1 2 "Sibogasyrinx". WoRMS. World Register of Marine Species. Retrieved 30 May 2022.
  2. ↑ P. Bouchet; Yu. I. Kantor; A. Sysoev & N. Puillandre (2011). "A new operational classification of the Conoidea (Gastropoda)" (PDF). Journal of Molluscan Studies. 77 (3): 273–308. doi:10.1093/mollus/eyr017.
  3. 1 2 3 Kantor, Y.I. & Puillandre, N. (2021). Rare, deep-water and similar: revision of Sibogasyrinx (Conoidea: Cochlespiridae). European Journal of Taxonomy. 773: 19-60. Public Domain This article incorporates text from this source, which is under a CC BY 4.0 license.