By Warren W. Burggren (editor), Brian R. McMahon (editor)
Curiosity in land crabs has burgeoned as biologists have more and more considering the evolution of terrestriality. earlier than the booklet of this quantity in 1988, there have been no unmarried entire resource of knowledge to serve biologists attracted to the various points of terrestrial decapod crustacean. Biology of the Land Crabs used to be the 1st synthesis of contemporary and common findings on brachyuran and anomuran crustaceans that experience developed various levels of version for all times on land. Chapters by way of top researchers take a coordinated evolutionary and comparative method of systematics and evolution, ecology, behaviour, replica, progress and molting, ion and water stability, respiratory and movement, and energetics and locomotion. each one discusses how terrestrial species became tailored from ancestral freshwater or marine kinds. With its large bibliography and entire index, together with the typical background of approximately 80 species of brachyuran and anomuran crabs, Biology of the Land Crabs will stay a useful reference for researchers and complicated scholars.
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8. A. Male of the mangrove tree crab, Aratus pisonii. Scale bar = 1 0 mm. ) B. Dactylus of the second right walking leg of Aratus pisonii. Scale bar = 1 mm. C. Left third maxilliped of Aratus pisonii to show transverse ridge. Scale bar = 2 mm. D. Pterygostomial region of Aratus pisonii to show area with reticulate pattern of geniculate setae. Scale bar = 5 mm. E. Geniculate setae from D. Scale bar = 1 mm. F. Ventral view of Sesarma ricordi to show setal tufts between bases of walking legs. Scale bar = 5 mm.
West Africa, from Sierra Leone to Angola (Monod, 1956). The habits of Aratus are unusual in that it is predominantly arboreal, spending most of its time out of water on the trunks, branches, and prop roots of mangrove trees (Hartnoll, 1965; Warner, 1969; von Hagen, 1977; Green, 1986). The dactyli of the walking legs are specialized for this arboreal habit, being short but extremely sharp (Fig. 8B), thus giving the crab an exceptional grip on the trees. There are a variety of crabs that climb trees occasionally (von Hagen, 1977), but Aratus is the only one to do so on such a regular basis.
In Madagascar there are several potamonid species inhabiting limestone forests, which are dry at certain seasons. , Madagapotamon humberti Bott and Gecarcinautes antongilensis (Rathbun), are active during the wet summer season, when water is available from the small pools that collect in irregularities in the eroded limestone. However, in the dry season such water is not available, and the crabs take shelter for a period of months in small caves in the limestone that provide a cool, damp environment (Vuillemin, 1970, 1972).