Gyraulus crista

Gyraulus crista, commonly called the Nautilus ramshorn, is a minute species of freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails.

Gyraulus crista
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Heterobranchia
clade Euthyneura
clade Panpulmonata
clade Hygrophila
Superfamily:
Planorboidea
Family:
Planorbidae
Subfamily:
Planorbinae
Tribe:
Planorbini
Genus:
Gyraulus
Subgenus:
Armiger
Species:
G. crista
Binomial name
Gyraulus crista
(Linnaeus, 1758)[2]
Synonyms

Nautilus crista Linnaeus, 1758
Armiger crista (Linnaeus, 1758)
Planorbis crista (Linnaeus, 1758)

Subspecies

Subspecies include:

  • Gyraulus crista cristatus Draparnaud, 1805
  • Gyraulus crista nautilus Linnaeus, 1767
  • Gyraulus crista spinulosus Clessin

Distribution

The distribution of this species is Holarctic (spread across the northern part of the whole northern hemisphere). The distribution type is circumpolar wide-temperate, and the range includes:

Shell description

The minute shell is nearly planispiral in its coiling, but the spire is actually considerably sunken rather than raised (which is usually the case with gastropods).

The shell has regular transverse ridges which form points extending beyond the main curve of the periphery of the shell.

The shell color is a translucent yellowy-brown. The maximum shell dimension is about 3 mm.

Ecology

This snail lives on water plants in clear still freshwater. In Ireland it is common in medium to very small habitats including slow streams, drains and marsh and fen pools It is occasionally found in very acid waters.

This minute species, although technically a pulmonate gastropod, does not use air for respiration but instead absorbs oxygen through its mantle cavity which is full of water.

References
  1. Killeen I., Van Damme D. & Seddon M. B. (2011). "Gyraulus crista". The IUCN Red List of Threatened Species. Version 2014.3. <www.iucnredlist.org>. Downloaded on 09 March 2015.
  2. Linnaeus, C. 1758. Systema Naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. 10th edition. - Vermes. Testacea: 700-781. Holmiae. (Salvius).
  3. (in Czech) Horsák M., Juřičková L., Beran L., Čejka T. & Dvořák L. (2010). "Komentovaný seznam měkkýšů zjištěných ve volné přírodě České a Slovenské republiky. [Annotated list of mollusc species recorded outdoors in the Czech and Slovak Republics]". Malacologica Bohemoslovaca, Suppl. 1: 1-37. PDF.
  4. Juřičková L., Horsák M. & Beran L., 2001: Check-list of the molluscs (Mollusca) of the Czech Republic. Acta Soc. Zool. Bohem., 65: 25-40.
  5. "Anemoon > Flora en Fauna > Soorteninformatie". www.anemoon.org.
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