Hemigrapsus sexdentatus: Difference between revisions
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| binomial = ''Hemigrapsus sexdentatus'' |
| binomial = ''Hemigrapsus sexdentatus'' |
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| binomial_authority = (Hilgendorf, 1882) |
| binomial_authority = (Hilgendorf, 1882) |
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The '''common rock crab''', ''Hemigrapsus edwardsi'', is a marine large-eyed crab of the [[family (biology)|family]] [[Grapsidae]], endemic to the sea coasts of [[New Zealand]] |
The '''common rock crab''', ''Hemigrapsus edwardsi'', is a marine large-eyed crab of the [[family (biology)|family]] [[Grapsidae]], endemic to the sea coasts of [[New Zealand]] except the [[Chatham Islands]] or the southern islands. It grows to around 40 [[millimetre|mm]] shell width. |
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This common intertidal crab occurs in a variety of habitat, under boulders, on the rocky reef, and on sand and mud flats. Coloration is a reddish purple, mottled with dirty white patches, with pale green antennules with dark red spots, but there are two colour types: light and dark. Darker crabs are marked with dark purple, sometimes almost purplish black, and their legs are banded. |
This common intertidal crab occurs in a variety of habitat, under boulders, on the rocky reef, and on sand and mud flats. Coloration is a reddish purple, mottled with dirty white patches, with pale green antennules with dark red spots, but there are two colour types: light and dark. Darker crabs are marked with dark purple, sometimes almost purplish black, and their legs are banded. |
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| accessdate =2008-8-11 |
| accessdate =2008-8-11 |
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==References== |
==References== |
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{{reflist}} |
{{reflist}} |
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==External links== |
==External links== |
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* [http://www.seafriends.org.nz/enviro/crust/grapsida.htm SeaFriends] |
* [http://www.seafriends.org.nz/enviro/crust/grapsida.htm SeaFriends] |
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Revision as of 05:26, 18 November 2008
| Common rock crab | |
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| Rock crab on tunicate colony of Didemnum | |
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| Species: | H. sexdentatus
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| Binomial name | |
| Hemigrapsus sexdentatus (Hilgendorf, 1882)
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| Synonyms | |
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Hemigrapsus edwardsi | |
The common rock crab, Hemigrapsus edwardsi, is a marine large-eyed crab of the family Grapsidae, endemic to the sea coasts of New Zealand except the Chatham Islands or the southern islands. It grows to around 40 mm shell width.
This common intertidal crab occurs in a variety of habitat, under boulders, on the rocky reef, and on sand and mud flats. Coloration is a reddish purple, mottled with dirty white patches, with pale green antennules with dark red spots, but there are two colour types: light and dark. Darker crabs are marked with dark purple, sometimes almost purplish black, and their legs are banded.
Females are in berry from March to August, and they carry up to 26,000 eggs (size 0.3 mm) for about 6 weeks, during which time the eggs change colour from light brown to transparent.
Rock crabs are known to feed on snails by crushing their shells through the use of a chela (a "nipper" or pincer-like appendage). Paul Bourdeau, of the State University of New York in Stony Brook, calls them, "the meanest organisms that I have ever come across."[1]
References
- ^ Marris, Emma (2008), "Snails transmute to guard against danger", Nature (published 2008-8-8), retrieved 2008-8-11
{{citation}}: Check date values in:|accessdate=and|publication-date=(help)