Hexapus is a genus of crabs in the family Hexapodidae. It contains only three extant species found in the Indo-West Pacific. They inhabit the intertidal and subtidal areas of shorelines.
| Hexapus Temporal range:
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|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Malacostraca |
| Order: | Decapoda |
| Suborder: | Pleocyemata |
| Infraorder: | Brachyura |
| Family: | Hexapodidae |
| Genus: | Hexapus De Haan, 1833 |
| Type species | |
| Cancer sexpes Fabricius, 1798
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| Species | |
Description
editLike other members of the family, these crabs are easily recognizable due to the complete absence of the last pair of walking legs (pereiopods). They thus only have six walking legs (excluding the claws), unlike the usual eight. Their carapace is subquadrate, wider than it is long, with a rounded anterior.[1]
Species
editThe following are the species classified under Hexapus.[1]
- Species marked with † are extinct
Extant species
edit- Hexapus bidentatus Velip & Rivonker, 2014
- Hexapus sexpes (Fabricius, 1798)
- Found from Cochin, southwest India to Phuket, Thailand and the Penang Strait of Malaysia
- Hexapus timika Rahayu & Ng, 2014
Fossil species
edit- †Hexapus decapoda (Morris & Collins, 1991)
- †Hexapus granuliformis Karasawa & Kato, 2008
- From Bolbe, Davao City, Philippines (Mandug Formation, early Pleistocene)[4]
- †Hexapus nakajimai Imaizumi, 1959
- From the Jōban Coal Field of Iwaki, Fukushima, Japan (Nakayama Formation, Miocene)[5]
- †Hexapus pinfoldi Collins & Morris, 1978
- From the Khyber Pakhtunkhwa of Pakistan (Kirthar Formation, Lutetian)[6]
Excluded species
editHexapus estuarinus is now regarded as a junior synonym of Hexapus sexpes. In addition, the following the species has been transferred to other genera:[1][7][8]
- Hexapus anfractus (Rathbun, 1909) - Originally described as Lambdophallus anfractus, now accepted as Mariaplax anfracta
- Hexapus buchanani Monod, 1956 - Now accepted as Theoxapus buchanani
- Hexapus edwardsii Serène & Soh, 1976 - Now accepted as Hexapinus edwardsii
- Hexapus granuliferus Campbell & Stephenson, 1970 - Now accepted as Mariaplax granuliferus
- Hexapus latipes De Haan, 1835 - Now accepted as Hexapinus latipes
- Hexapus stebbingi Barnard, 1947 - Now accepted as Tritoplax stebbingi
- Hexapus stephenseni Serène & Soh, 1976 - Now accepted as Mariaplax stephenseni
- Hexapus williamsi Glassell, 1938 - Now accepted as Stevea williamsi
References
edit- ^ a b c Dwi Listyo Rahayu; Peter K. L. Ng (2014). "New genera and new species of Hexapodidae (Crustacea, Brachyura) from the Indo-West Pacific and east Atlantic" (PDF). Raffles Bulletin of Zoology. 62: 396–483. Archived from the original (PDF) on 2014-12-15. Retrieved 2014-12-15.
- ^ Dinesh T. Velip; Chandrashekher U. Rivonker (2014). "Hexapus bidentatus sp. nov. (Crustacea: Decapoda: Brachyura: Hexapodidae), a new species from Goa, west coast of India". Marine Biology Research. 11 (1): 97–105. doi:10.1080/17451000.2014.889305. S2CID 83647412.
- ^ S. F. Morris; J. S. H. Collins (1991). "Neogene crabs from Brunei, Sabah and Sarawak. Bulletin of the British Museum of Natural History". Bulletin of the British Museum (Natural History), Geology. 47 (1): 1–33.
- ^ Hiroaki Karasawa; Hisayoshi Kato; Tomoki Kase; Yolanda Maac-Aguilar; Yukito Kurihara; Hiroki Hayashi; Kyoko Hagino (2008). "Neogene and Quaternary ghost shrimps and crabs (Crustacea, Decapoda) from the Philippines". Bulletin of the National Museum of Nature and Science. Series C, Geology & Paleontology. 34: 51–76.
- ^ Rikizo Imaizumi (1959). "A fossil crab, Hexapus nakajimai n. sp. from Jōban Coal Field" (PDF). Japanese Journal of Geology and Geography. 30: 25–30.
- ^ "†Hexapus pinfoldi Collins and Morris 1978 (crab)". Fossilworks. Paleobiology Database. Retrieved December 15, 2014.
- ^ Jung-Fu Huang; Pan-Wen Hsueh; Peter K. L. Ng (2002). "Crabs of the family Hexapodidae (Decapoda: Brachyura) from taiwan, with description of a new genus and new species" (PDF). Journal of Crustacean Biology. 22 (3): 651–660. doi:10.1163/20021975-99990277.
- ^ Peter J. F. Davie (2014). "Hexapus De Haan, 1835". WoRMS. World Register of Marine Species. Retrieved December 16, 2014.