Cape hummers
| Cape hummers | ||||||||||||
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Drawing by Johann Friedrich Wilhelm Herbst , 1792 |
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| Systematics | ||||||||||||
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| Scientific name of the genus | ||||||||||||
| Homarinus | ||||||||||||
| Kornfield, Williams & Steneck, 1995 | ||||||||||||
| Scientific name of the species | ||||||||||||
| Homarinus capensis | ||||||||||||
| ( Autumn , 1792) |
The cape lobster ( Homarinus capensis ), also spelled Cape lobster , is a species of decapod crabs from the monotypical genus Homarinus . Until 1995, this species was part of the genus Hummer ( Homarus ), but was u. a. issued to a new genre due to their much smaller body size. The name "Homarinus" means "lobster-like", the specific epithet refers to the origin of the species, the waters around the Cape of Good Hope .
description
The kaphummer reaches body lengths of 8 to 10 cm, the carapace is 4 to 5 cm long. Its color is coral red to brownish yellow.
The body is similar to that of the lobster ( Homarus ). In contrast to the former, the scissors on the first striding legs are clearly hairy. The large scissors on the first pair of legs have an elongated appearance because of the elongated carpus . While the rostrum of American and European lobsters is erect towards the tip, it is flattened in cape lobsters and has smaller lateral thorns. The gonopores are relatively large, which is why it is believed that the eggs are not only much larger than other lobsters, but also fewer in number.
Despite their morphological similarities, the genera Homarus and Homarinus are not sister groups . Rather, phylogenetic studies indicate that there is a convergence .
Spread and endangerment
The natural distribution area of the cape extends on the South African coast from Dassen Island near Cape Town in the west to Haga Haga in the Eastern Cape Province in the east. There it lives in rather shallow coastal waters on stony ground. The Cape Bummer is not fished and is an extremely rare species that is critically endangered.
Taxonomy
The cape mummer was first described by Johann Friedrich Wilhelm Herbst in 1792 as Cancer (Astacus) capensis . Synonyms are Astacus fulvus Fabricius, 1793, Homarus fulvus Weber, 1795, Astacus capensis Latreille, 1802 and Cancer (Astacus) fulvus Turton, 1806.
swell
literature
- Lipke B. Holthuis: Marine Lobsters of the World . An Annotated and Illustrated Catalog of Species of Interest to Fisheries Known to Date. Ed .: Food and Agriculture Organization (= FAO Fisheries Synopsis . Volume 125 ). Rome 1991, ISBN 978-92-5103027-1 , pp. 59 ( fao.org [PDF; 916 kB ; accessed on February 21, 2012]).
- Irv Kornfield, Austin Williams, Robert S. Steneck: Assignment of Homarus capensis (Herbst, 1792), the Cape lobster of South Africa, to Homarius new genus (Decapoda: Nephropidae) . In: Fishery Bulletin . tape 93 , no. 1 , 1995, ISSN 0090-0656 , p. 97-102 ( noaa.gov [PDF; 810 kB ; accessed on February 21, 2012]).
- Ryusuke Kado, Jiro Kittaka, Yasuhiro Hayakawa, DE Pollock: Recent discoveries of the "rare" species Homarus capensis (Herbst, 1792) on the South African coast . In: Crustaceana . tape 67 , no. 1 , 1994, p. 71-75 , doi : 10.1163 / 156854094X00305 .
- Dale Tshudy, Rafael Robles, Tin-Yam Chan, Ka Chai Ho, Ka Hou Chu, Shane T. Ahyong, Darryl L. Felder: Phylogeny of marine clawed lobster families Nephropidae Dana, 1852, and Thaumastochelidae Bate, 1888, based on mitochondrial genes . In: Joel W. Martin, Keith A. Crandall, Darryl L. Felder (Eds.): Decapod Crustacean Phylogenetics . CRC Press, 2009, ISBN 1-4200-9258-8 , pp. 357-368 .