Monostiolum

Monostiolum
Shell of Monostiolum rosewateri (holotype at the Smithsonian Institution)
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Neogastropoda
Family: Pisaniidae
Genus: Monostiolum
Dall, 1904
Type species
Triton swifti
Tryon, 1881
Synonyms
  • Bailya (Bailya) M. Smith, 1944· alternative representation
  • Bailya (Parabailya) Watters & Finlay, 1989
  • Caducifer (Monostiolum)
  • Colubraria (Monostiolum) Dall, 1904 (original rank)

Monostiolum is a genus of sea snails, marine gastropod mollusks in the family Pisaniidae.

General characteristics

(Original description) The shell is small, with an elevated spire and a single terminal varix. The nucleus bears a protoconch that is immersed in the first nepionic whorl, leaving a distinct apical pit. The subsequent whorls are axially ribbed, although the ribs become obsolete on the later whorls of the adult shell. The coloration is similar to that of Colubraria s. s., and the sutures are appressed. The operculum is elongate-ovate and has an apical nucleus.

The animal has slender tentacles, with the eyes prominently situated on their outer bases. The verge is sickle-shaped and recurved over the back of the neck. The radula is long and bears teeth closely resembling those of Pisania maculosa (Lamarck, 1822) (synonym of Pisania striata (Gmelin, 1791))> and Pisania fusiformis (Blainville, 1932) (synonym of Solenosteira fusiformis (Blainville, 1832)). The dental formula is 1/3 1/3 1/3, and the base of the rachidian tooth is not excavated anteriorly.

Species

Species within the genus Monostiolum include:

Species brought into synonymy

References

  1. 1 2 Monostiolum. Retrieved through: World Register of Marine Species on 16 July 2012.
  2. ↑ Dall, W.H. (1904). "An historical and systematic review of the frogshells and tritons". Smithsonian Miscellaneous Collections. 47: 136. Retrieved 6 August 2026. Public Domain This article incorporates text from this source, which is in the public domain.
  3. ↑ Monostiolum fumosum Watters, 2009. Retrieved through: World Register of Marine Species on 17 April 2010.
  4. ↑ Monostiolum harryleei Garcia, 2006. Retrieved through: World Register of Marine Species on 17 April 2010.
  5. ↑ Monostiolum nocturnum Watters, 2009. Retrieved through: World Register of Marine Species on 17 April 2010.
  6. ↑ Monostiolum tessellatum (Reeve, 1844). Retrieved through: World Register of Marine Species on 17 April 2010.
  7. ↑ Monostiolum weberi (Watters, 1983). Retrieved through: World Register of Marine Species on 26 August 2010.