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 (Chasmagnathus) 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

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" (PDF). Raffles Bulletin of Zoology. 17: 1–286. Archived from the original (PDF) on 2011-06-06.
Hsi-Te Shih; Hiroshi Suzuki (2008). "Taxonomy, phylogeny, and biogeography of the endemic mudflat crab Helice/Chasmagnathus complex (Crustacea: Brachyura: Varunidae) from East Asia" (PDF). Zoological Studies. 47 (1): 114–125.
Katsushi Sakai (ed.). "Chasmagnathus convexus". Crabs of Japan. Retrieved January 16, 2009.
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.

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[Ng-1] 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" (PDF). Raffles Bulletin of Zoology. 17: 1–286. Archived from the original (PDF) on 2011-06-06.

[Shih2008-2] Hsi-Te Shih; Hiroshi Suzuki (2008). "Taxonomy, phylogeny, and biogeography of the endemic mudflat crab Helice/Chasmagnathus complex (Crustacea: Brachyura: Varunidae) from East Asia" (PDF). Zoological Studies. 47 (1): 114–125.

[MSIP-3] Katsushi Sakai (ed.). "Chasmagnathus convexus". Crabs of Japan. Retrieved January 16, 2009.

[Miyasaka2007-4] 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.