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Hexapodidae
| Description | Hexapodidae is a family of crabs, the only family in the superfamily Hexapodoidea. It has traditionally been treated as a subfamily of the family Goneplacidae, and was originally described as a subfamily of Pinnotheridae. Its members can be distinguished from all other true crabs by the reduction of the thorax, such that only seven sternites are exposed, and only four pairs of pereiopods are present. Not counting the enlarged pair of claws, this leaves only six walking legs, from which the type genus Hexapus, and therefore the whole family, takes its name. Some anomuran "crabs", such as porcelain crabs and king crabs also have only four visible pairs of legs. With the exception of Stevea williamsi, from Mexico, all the extant members are found either in the Indo-Pacific oceans, or around the coast of Africa. From Wikipedia article at https://en.wikipedia.org/wiki/Hexapodidae, which is released under the Creative Commons Attribution-Share-Alike License 3.0. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Source Data |
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| Rank | family | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Taxonomy (GBIF,PBDB) | Life : Animalia : Arthropoda : Malacostraca : Decapoda : Hexapodidae | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Taxonomic Status (GBIF) | accepted | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Classification (PBDB,GBIF) |
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| Scientific Name | Hexapodidae | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Opinions (PBDB) |
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| Status (PBDB) | extant | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Taxon Size (PBDB) | 61 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Extant Size (PBDB) | 8 (13%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| First Recorded Appearance | 66.0 - 61.7 Ma Paleocene | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Motility | actively mobile (based on Malacostraca) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Vision | well-developed (based on Malacostraca) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Diet | carnivore (based on Decapoda) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Taphonomy | chitin (based on Malacostraca) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Primary Reference (PBDB) | H. Karasawa and C. E. Schweitzer. 2006. A new classification of the Xanthoidea sensu lato (Crustacea: Decapoda: Brachyura) based on phylogenetic analysis and traditional systematics and evaluation of all fossil Xanthoidea sensu lato. Contributions to Zoology 75(1/2):23-72 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Common Name(s) | γ γγ’γ·γ¬γ | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Wikipedia | https://en.wikipedia.org/wiki/Hexapodidae |
External Images
Fossil Distribution
Subtaxa
| Name | Status | Common Name(s) | Fossil Occurrences | Oldest | Youngest |
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| Hexapodinae β subfamily | listed (PBDB) | ||||
| Bellhexapus β genus | accepted (GBIF) listed (PBDB) | ||||
| Eohexapus β genus | accepted (GBIF) listed (PBDB) | ||||
| Eurohexapus β genus | accepted (GBIF) listed (PBDB) | ||||
| Gollincarcinus β genus | accepted (GBIF) listed (PBDB) | ||||
| Goniocypoda β genus | accepted (GBIF) listed (PBDB) | 2 | 56.0 Ma Paleocene | 55.8 Ma Eocene | |
| Headonipus genus | accepted (GBIF) | No associated record in PBDB | |||
| Hexalaughlia genus | accepted (GBIF) | No associated record in PBDB | |||
| Hexapinus β genus | accepted (GBIF) listed (PBDB) | 1 | 0.01 Ma Pleistocene | 0.01 Ma Pleistocene | |
| Hexaplax β genus | accepted (GBIF) listed (PBDB) | ||||
| Hexapus genus | accepted (GBIF) listed (PBDB) | 3 | 47.8 Ma Eocene | 0 Ma Extant | |
| Holthuisea β genus | accepted (GBIF) listed (PBDB) | ||||
| Lambdophallus genus | accepted (GBIF) listed (PBDB) | 0 Ma Extant | |||
| Latohexapus β genus | accepted (GBIF) listed (PBDB) | ||||
| Lessinioplax β genus | accepted (GBIF) listed (PBDB) | ||||
| Maingrapsus β genus | accepted (GBIF) listed (PBDB) | ||||
| Mariaplax genus | accepted (GBIF) | No associated record in PBDB | |||
| Paeduma β genus | accepted (GBIF) listed (PBDB) | ||||
| Palaeopinnixa β genus | listed (PBDB) | 9 | 66.0 Ma Late/Upper Cretaceous | 13.8 Ma Miocene | |
| Paracorallicarcinus β genus | accepted (GBIF) listed (PBDB) | 3 | 48.6 Ma Eocene | 48.6 Ma Eocene | |
| Parahexapus β genus | accepted (GBIF) listed (PBDB) | ||||
| Pseudohexapus β genus | accepted (GBIF) listed (PBDB) | ||||
| Rayapinus genus | accepted (GBIF) | No associated record in PBDB | |||
| Spiroplax β genus | accepted (GBIF) listed (PBDB) | ||||
| Stevea β genus | accepted (GBIF) listed (PBDB) | 1 | 66.0 Ma Late/Upper Cretaceous | 66.0 Ma Late/Upper Cretaceous | |
| Thaumastoplax genus | accepted (GBIF) listed (PBDB) | 4 | 55.8 Ma Eocene | 0 Ma Extant | |
| Theoxapus genus | accepted (GBIF) | No associated record in PBDB | |||
| Tritoplax β genus | accepted (GBIF) listed (PBDB) | ||||
Synonymy List
| Year | Name and Author |
|---|---|
| 1886 | Hexapodidae Miers |
| 2000 | Hexapodidae Schweitzer et al. p. 55 |
| 2001 | Hexapodidae Schweitzer and Feldmann p. 331 |
| 2002 | Hexapodidae Schweitzer and Feldmann p. 961 |
| 2005 | Hexapodidae Schweitzer p. 289 |
| 2006 | Hexapodidae Karasawa and Schweitzer p. 58 |
| 2010 | Hexapodidae Schweitzer et al. |
| 2017 | Hexapodidae Luque et al. p. 24 |
References
Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!
