Nephropsis
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| Wood-Mason , 1872 |
Nephropsis is a marine genus of the decapods (Decapoda) from the family of the lobster-like (Nephropidae). Today it comprises 15 species that are distributed in the Atlantic, Pacific and Indian Oceans.
description
In Nephropsis , the rostrum is straight and hairy on its lateral edges. It has no or one or two pairs of lateral spikes directed obliquely forward, but always no spines on the abdomen. Starting from the rostrum, two ridges, sometimes with points, run on the back to over the front area of the carapace . Behind the rostrum there is a clear tubercles (gastric tubercle).
The first thus of the abdomen is smooth and without a ridge. The remaining somites can each have a median ridge. The pleura , the lateral attachments of the somite, are almost triangular and do not overlap. The telson is oblong and rectangular and has small to the side (posterolateral) tips on the posterior edges.
The unpigmented eyes are small and the stem is relatively short. The flagella of the first pair of antennae are shorter than the carapace, those of the second pair are longer than the total body length. The antenna base (antennal peduncle) has no exopodites (scaphocerites).
The scissors on the first pair of striding legs are the same, can be hairy and sometimes have small thorns. The pointed scissor fingers are bent and cross each other. They are about as long as the scissor hand. The second and third pair of striding legs have long hair on the small scissors. There are no scissors on the fourth and fifth pair. In males, the coxa of the third stride leg have a mostly pointed process.
The first pair of swimming legs of the males is hardened, that of the females is soft and flexible. The uropods are broad and strong, both endo- and exopodit have a point on their lateral edge. A diaeresis, a transverse depression on the uropod expodite, may or may not be present.
The total body length of the Nephropsis species can be 2 cm to 15 cm.
distribution
The species of Nephropsis are distributed in the Indo-Pacific , in the eastern and western Atlantic and in the eastern Pacific at sea depths of 180 m to 1800 m.
Systematics and taxonomy
The genus Nephropsis consists of the following recently known species:
- Nephropsis acanthura Macpherson, 1990
- Nephropsis aculeata Smith, 1881
- Nephropsis agassizii A. Milne-Edwards, 1880
- Nephropsis atlantica Norman, 1882
- Nephropsis carpenteri Wood-Mason, 1885
- Nephropsis ensirostris Alcock, 1901
- Nephropsis holthuisii Macpherson, 1993
- Nephropsis malhaensis Borradaile, 1910
- Nephropsis neglecta Holthuis, 1974
- Nephropsis occidentalis Faxon, 1893
- Nephropsis rosea Bate, 1888
- Nephropsis serrata Macpherson, 1993
- Nephropsis stewarti Wood-Mason, 1872
- Nephropsis suhmi Bate, 1888
- Nephropsis sulcata Macpherson, 1990
Another species is known to fossil. Within the lobster-like family, Nephropsis is more closely related to the genus Metanephrops . The inclusion of this genus together with Nephropides , Thymops and Thymopsis in the subfamily Thymopinae Holthuis, 1974 is out of date and is not supported by the results of a phylogenetic study.
James Wood-Mason caught a female individual of Nephropsis stewarti in the Andamans from a depth between 260 and 300 fathoms (corresponds to 468 m and 540 m) and described the genus Nephropsis based on this type species . The suffix '-opsis' means 'external appearance of', the generic name consequently refers to the morphological similarities with Nephrops .
literature
Individual evidence
- ↑ a b c d e f Lipke B. Holthuis: The Lobsters of the Superfamily Nephropidea of the Atlantic Ocean (Crustacea: Decapoda) . In: Bulletin of Marine Science . tape 24 , no. 4 , 1974, p. 723-884 ( Online [PDF; 16.0 MB ; accessed on July 3, 2012]).
- ^ A b 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 92-5103027-8 ( fao.org ).
- ↑ Tin-Yam Chan: Annotated checklist of the world's marine lobsters (Crustacea: Decapoda: Astacidea, Glypheidea, Achelata, Polychelida) . In: The Raffles Bulletin of Zoology . Suppl. 23, 2010, p. 153–181 ( Online [PDF; 1.7 MB ; accessed on July 3, 2012]).
- ↑ Sammy De Grave, N. Dean Pentcheff, Shane T. Ahyong et al .: A classification of living and fossil genera of decapod crustaceans . In: Raffles Bulletin of Zoology . Suppl. 21. 2009, p. 1–109 ( online [PDF; 7,8 MB ; accessed on July 3, 2012]).
- ↑ 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 ( Online [PDF; 1,2 MB ; accessed on July 3, 2012]).
- ↑ James Wood-Mason: On Nephropsis Stewarti, a new Genus ans Species of Macrurous Crustaceans, dredged in deep water off the Eastern Coast of the Andaman Islands . In: The Annals and magazine of natural history . tape 4 (12) , 1873, pp. 59–64 ( page 59ff, biodiversitylibrary.org [accessed July 3, 2012]).
