Chinaman's hat (Calyptraea chinensis)
|Researched by||Marie Skewes||Refereed by||Admin|
|Other common names||-||Synonyms||-|
Recorded distribution in Britain and IrelandPresent on south-west coasts of Britain, in the western Channel and off the Isle of Man. Reaches its northern limit on the west coast of Scotland but not recorded from Ireland.
Global distributionExtends south from the British Isles to the Mediterranean and north-west Africa.
HabitatPresent on shells or under stones at low water of spring tides on sheltered shores in south-west England, and in the sublittoral on stones and shell gravel associated with soft substrata down to 20 m on the west coast of England.
- Conical shell not spirally coiled except in apical whorls (protoconch).
- Aperture nearly circular.
- Internal tongue-shaped partition present, extending from apex to edge of shell.
- Flattened neck lobe present on each side of head behind tentacles.
Additional informationCalyptraea chinensis is a protandrous hermaphrodite: animals with a shell width of up to 2 mm are male, larger specimens are female. Calyptraea chinensis may spread further northwards and increase in abundance as a result of seawater warming.
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Last Updated: 29/08/2003