Gyraulus crista

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Gyraulus crista
Conservation status
NE
Scientific classification
Kingdom: Animalia Phylum: Mollusca Class: Gastropoda Subclass: Orthogastropoda Superorder: Heterobranchia Order: Pulmonata Family: Planorbidae Genus: Gyraulus Species: G. crista
Binomial name
Gyraulus crista (Linnaeus, 1758)

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.

Synonyms:

• Armiger crista

Subspecies:

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

Contents 1 Distribution 2 Habitat 3 Shell description 4 Life habits 5 References 6 External links

[edit] Distribution

Holarctic:

• Not listed in IUCN red list - not evaluated (NE) ^[1]
• The Czech Republic - least concern (LC) ^[2]
• Germany
• Netherlands ^[3]
• Slovakia
• Sweden
• The British Isles
• ...

[edit] Habitat

On water plants in freshwater.

[edit] 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.

[edit] Life habits

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

[edit] References

[edit] External links