Chasmagnathus

Chasmagnathus
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Crustacea
Class:	Malacostraca
Order:	Decapoda
Infraorder:	Brachyura
Family:	Varunidae
Genus:	Chasmagnathus De Haan, 1833 [1]
Species:	C. convexus
Binomial name
Chasmagnathus convexus (De Haan, 1835) [1]
Synonyms [1]
Ocypode convexus De Haan, 1833 Helice spinicarpa H. Milne-Edwards, 1853

Chasmagnathus convexus is a common mud-flat crab of the family Varunidae, which is endemic to East Asia.^[2][3] In Japan, this crab is commonly called hamagani. This crab has two forms that differ in color; one is olive green and the other is purple.^[2] Differences in diet are believed to be responsible for the color variation between the two forms. C. convexus is large, relative to related crabs, and can reach 4.5 to 5 centimetres (1.8 to 2.0 in) wide across its carapace.^[4] It is predominantly nocturnal.^[2]

References

1. ^ ^{a b c} Peter K. L. Ng, Danièle Guinot & Peter J. F. Davie (2008). "Systema Brachyurorum: Part I. An annotated checklist of extant Brachyuran crabs of the world". Raffles Bulletin of Zoology 17: 1–286. http://rmbr.nus.edu.sg/rbz/biblio/s17/s17rbz.pdf. 
2. ^ ^{a b c} Hsi-Te Shih & Hiroshi Suzuki (2008). "Taxonomy, phylogeny, and biogeography of the endemic mudflat crab Helice/Chasmagnathus complex (Crustacea: Brachyura: Varunidae) from East Asia". Zoological Studies 47 (1): 114–125. http://www.ceps.com.tw/ec/ecjnlarticleView.aspx?atliid=1080516. 
3. ^ Katsushi Sakai, ed. "Chasmagnathus convexus". Crabs of Japan. http://species-identification.org/species.php?species_group=crabs_of_japan&id=1734&menuentry=soorten. Retrieved January 16, 2009. 
4. ^ Hitoshi Miyasaka, Motomi Genkai-Kato, Yukiko Goda & Koji Omori (2007). "Length-weight relationships of two varunid crab species, Helice tridens and Chasmagnathus convexus, in Japan". Limnology 8 (1): 81–83. doi:10.1007/s10201-006-0195-8. http://www.springerlink.com/index/106745J4158020N3.pdf. 

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