Tweedieia
Superfamily, Crabs, Families, Atelecy, Clidae, Cancridae
978-620-1-58690-1
6201586903
76
2012-07-25
34.00 €
eng
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Tweedieia is a genus of crabs in the family Xanthidae, containing the following species:Crabs are generally covered with a thick exoskeleton, and armed with a single pair of chelae (claws). Crabs are found in all of the world's oceans, while many crabs live in fresh water and on land, particularly in tropical regions. Crabs vary in size from the pea crab, a few millimetres wide, to the Japanese spider crab, with a leg span of up to 4 metres (13 ft).The earliest unambiguous crab fossils date from the Jurassic, although Carboniferous Imocaris, known only from its carapace, may be a primitive crab.[8] The radiation of crabs in the Cretaceous and afterward may be linked either to the break-up of Gondwana or to the concurrent radiation of bony fish, crabs' main predators.
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动物学
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