Plesiotrochus

Plesiotrochus
Plesiotrochus monachus
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked): clade Caenogastropoda
clade Sorbeoconcha
Superfamily: Campaniloidea
Family: Plesiotrochidae
Genus: Plesiotrochus
Fischer, 1878
Type species
Plesiotrochus souverbianus Fischer, 1878
Synonyms
  • Hemicerithium Cossmann, 1893
  • Hypotrochus Cotton, 1932

Plesiotrochus is a genus of sea snails, marine gastropod mollusks in the family Plesiotrochidae.[1]

Plesiotrochus was originally placed in the superfamily Cerithioidea but was subsequently transferred to the superfamily Campaniloidea by Healy (1993).[2]

Description

The shell have an elongate, conical shape. Their length of rather small (between 5 mm and 10 mm, with one species up to 24 mm). The imperforate whorls are flat to concave. The subrhomboidal aperture is smooth within and prolonged by a short siphonal canal. The outer lip is subrostrate in the middle. The columella and the siphonal canal are twisted. The sculpture shows conspicuous ribs with varices or just spirals. The operculum is eccentric.[3]

Distribution

The species occur in the Indo-Pacific.

Species

Species within the genus Plesiotrochus include:

  • Plesiotrochus acutangulus (Yokoyama, 1924)
  • Plesiotrochus calliostomoides (Thiele, 1929)
  • Plesiotrochus crinitus Thiele, 1930
  • † Plesiotrochus fallax Grateloup 1832
  • Plesiotrochus luteus (Gould, 1861)
  • Plesiotrochus monachus (Crosse & Fischer, 1864)
  • Plesiotrochus pagodiformis Hedley, 1907
  • Plesiotrochus paucicostatus Kilburn, 1975
  • Plesiotrochus penetricinctus (Cotton, 1932)
  • Plesiotrochus souverbianus Fischer, 1878 [4]
  • † Plesiotrochus stephanense Cossmann and Peyrot 1922
Species brought into synonymy
  • Plesiotrochus exilis Pease, W.H., 1867: synonym of Plesiotrochus souverbianus Fischer, 1878
  • Plesiotrochus nipponkaiensis Habe & Masuda, 1990: synonym of Ittibittium nipponkaiense (Habe & Masuda, 1990)
  • Plesiotrochus penitricinctus [sic] : synonym of Plesiotrochus penetricinctus (Cotton, 1932)
  • Plesiotrochus unicinctus Adams, A., 1853: synonym of Plesiotrochus souverbianus Fischer, 1878

References

  1. ↑ Plesiotrochus Fischer, 1878.  Retrieved through: World Register of Marine Species on 28 June 2013.
  2. ↑ Healy,J.M. 1993. Transfer of the gastropod family Plesiotrochidae to the Campaniloidea based on sperm ultrastructural evidence. Journal ol Molluscan Studies 59(2):135-146.
  3. ↑ Tryon (1887), Manual of Conchology IX – Solariidae (by William B. Marshall), Ianthinidae, Trichotropidae, Scalariidae, Cerithiidae, Rissoidae, Littorinidae
  4. ↑ Plesiotrochus souverbianus .  Retrieved through: World Register of Marine Species on 17 May 2010.
  • Houbrick R.S. 1990. Aspect of the anatomy of Plesiotrochus (Plesiotrochidae, fam. n.) and its systematic position in Cerithioidea (Prosobranchia Caenogastropoda). pp. 237–249, in: Wells F.E., Walker D.I., Kirkman H. & Letheridge R., eds., The marine fauna and flora of Albany. Volume 1. Perth, Western Australia Museum. page(s): 238


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