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词条 Hexapus
释义

  1. Description

  2. Species

     Extant species  Fossil species  Excluded species 

  3. References

{{For|the six-legged octopus|Henry the Hexapus}}{{Italic title}}{{Taxobox
| name = Hexapus
| fossil_range = {{fossil_range|Lutetian|Recent}}
| regnum = Animalia
| phylum = Arthropoda
| subphylum = Crustacea
| classis = Malacostraca
| ordo = Decapoda
| infraordo = Brachyura
| familia = Hexapodidae
| genus=Hexapus
| genus_authority = De Haan, 1833
| type_species= Cancer sexpes
| type_species_authority=Fabricius, 1798
| subdivision_ranks = Species
| subdivision =See text
}}

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.

Description

{{main|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 {{extinct}} 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

  • {{extinct}}Hexapus decapoda (Morris & Collins, 1991)

Originally described as Prepaeduma decapoda. From Sarawak, Borneo, Malaysia (Miri Formation, Pliocene)[3]

  • {{extinct}}Hexapus granuliformis Karasawa & Kato, 2008

From Bolbe, Davao City, Philippines (Mandug Formation, early Pleistocene)[4]

  • {{extinct}}Hexapus nakajimai Imaizumi, 1959

From the Jōban Coal Field of Iwaki, Fukushima, Japan (Nakayama Formation, Miocene)[5]

  • {{extinct}}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

References

1. ^1 2 {{cite journal|author1=Dwi Listyo Rahayu |author2=Peter K. L. Ng |year=2014|title=New genera and new species of Hexapodidae (Crustacea, Brachyura) from the Indo-West Pacific and east Atlantic|journal=Raffles Bulletin of Zoology|volume=62|pages=396–483|url=http://lkcnhm.nus.edu.sg/nus/images/data/raffles_bulletin_of_zoology/zoology_volume_62/62rbz396-483.pdf}}
2. ^{{cite journal|author1=Dinesh T. Velip |author2=Chandrashekher U. Rivonker |year=2014|title=Hexapus bidentatus sp. nov. (Crustacea: Decapoda: Brachyura: Hexapodidae), a new species from Goa, west coast of India|journal=Marine Biology Research|volume=11|issue=1|pages=97–105|doi=10.1080/17451000.2014.889305}}
3. ^{{cite journal|author1=S. F. Morris |author2=J. S. H. Collins |year=1991|title=Neogene crabs from Brunei, Sabah and Sarawak. Bulletin of the British Museum of Natural History|journal=Bulletin of the British Museum (Natural History), Geology|volume=47|issue=1|pages=1–33|url=https://archive.org/details/bulletinofbritis47brit}}
4. ^{{cite journal|author1=Hiroaki Karasawa |author2=Hisayoshi Kato |author3=Tomoki Kase |author4=Yolanda Maac-Aguilar |author5=Yukito Kurihara |author6=Hiroki Hayashi |author7=Kyoko Hagino |year=2008|title=Neogene and Quaternary ghost shrimps and crabs (Crustacea, Decapoda) from the Philippines|journal=Bulletin of the National Museum of Nature and Science. Series C, Geology & Paleontology|volume=34|pages=51–76|url=https://www.researchgate.net/profile/Hiroaki_Karasawa/publication/261675206_Neogene_and_quaternary_ghost_shrimps_and_crabs_%28Crustacea_Decapoda%29_from_the_Philippines/links/02e7e534f975a5382f000000?ev=pub_ext_doc_dl&origin=publication_detail&inViewer=true}}
5. ^{{cite journal|author=Rikizo Imaizumi|year=1959|title=A fossil crab, Hexapus nakajimai n. sp. from Jōban Coal Field|journal=Japanese Journal of Geology and Geography|volume=30|pages=25–30|url=http://decapoda.nhm.org/pdfs/37024/37024.pdf}}
6. ^{{cite web|url=http://fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=225862|title=†Hexapus pinfoldi Collins and Morris 1978 (crab)|work=Fossilworks|publisher=Paleobiology Database|accessdate=December 15, 2014}}
7. ^{{cite journal |title=Crabs of the family Hexapodidae (Decapoda: Brachyura) from taiwan, with description of a new genus and new species |author1=Jung-Fu Huang |author2=Pan-Wen Hsueh |author3=Peter K. L. Ng |journal=Journal of Crustacean Biology |volume=22 |issue=3 |pages=651–660 |year=2002 |url=http://decapoda.nhm.org/pdfs/17381/17381.pdf |doi=10.1163/20021975-99990277}}
8. ^{{cite WoRMS|author=Peter J. F. Davie|year=2014|id=246312|title=Hexapus De Haan, 1835 |db=crustacea|accessdate=December 16, 2014}}
{{Taxonbar|from=Q18592040}}

3 : Crabs|Extant Lutetian first appearances|Lutetian genus first appearances
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