Search Field Guide
Advanced Search
Montana Field Guide

Montana Field Guides

Star Gyro - Gyraulus crista


Global Rank: G5
State Rank: SNR

Agency Status
USFWS:
USFS:
BLM:


 

External Links





 
General Description
Gyraulus crista, commonly called the Star Gyro or Nautilus ramshorn, is a minute species of freshwater snail only about 3mm across, in the family Planorbidae, the ram's horn snails. These small snails have the ability to persist in intermittent ponds and lakes

Diagnostic Characteristics
Very small rarely exceeding 3mm. 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.
Shell color is a translucent yellowy-brown.

Range Comments
The distribution of this species is Holarctic, and includes: the continents of Europe, North America and northern Asia

Summary of Observations Submitted for Montana
Number of Observations: 1

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat
Usually found on aqautic vegetation within ponds, lakes, wetlands or other lentic waterbodies,

Food Habits
Like most snails, these are herbivorous- scrapers of algae, detritus and diatoms from other vegetation of benthic substrates

Ecology
Species may be found in intermittent waters including temporary ponds and streams:

References
Login Logout
Citation for data on this website:
Star Gyro — Gyraulus crista.  Montana Field Guide.  .  Retrieved on , from