Hexapus

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.

For the six-legged octopus, see Henry the Hexapus.

Hexapus
Temporal range: Lutetian–Recent
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Subphylum:
Crustacea
Class:
Malacostraca
Order:
Decapoda
Infraorder:
Brachyura
Family:
Hexapodidae
Genus:
Hexapus

De Haan, 1833
Type species
Cancer sexpes
Fabricius, 1798
Species

See text

Description
Main article: Hexapodidae

Like 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

The following are the species classified under Hexapus.[1]

Species marked with † are extinct

Extant species
  • Hexapus bidentatus Velip & Rivonker, 2014
Found in Goa, India[2]
  • Hexapus sexpes (Fabricius, 1798)
Found from Cochin, southwest India to Phuket, Thailand and the Penang Strait of Malaysia
  • Hexapus timika Rahayu & Ng, 2014
Found in Timika, Papua, Indonesia

Fossil species
  • †Hexapus decapoda (Morris & Collins, 1991)
Originally described as Prepaeduma decapoda. From Sarawak, Borneo, Malaysia (Miri Formation, Pliocene)[3]
  • †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

Hexapus 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
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References
  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. Rikizo Imaizumi (1959). "A fossil crab, Hexapus nakajimai n. sp. from Jōban Coal Field" (PDF). Japanese Journal of Geology and Geography. 30: 25–30.
  6. "†Hexapus pinfoldi Collins and Morris 1978 (crab)". Fossilworks. Paleobiology Database. Retrieved December 15, 2014.
  7. 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.
  8. Peter J. F. Davie (2014). "Hexapus De Haan, 1835". WoRMS. World Register of Marine Species. Retrieved December 16, 2014.
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