Eunephrops

Eunephrops
Systematics
Class :	Higher crabs (Malacostraca)
Order :	Decapods (decapoda)
Subordination :	Pleocyemata
Partial order :	Large crayfish (Astacidea)
Family :	Lobster-like (Nephropidae)
Genre :	Eunephrops
Scientific name
	Eunephrops
	Smith , 1885

Eunephrops is a marine genus of the decapods (Decapoda) from the family of the lobster-like (Nephropidae). It comprises four species, all of which are common in the Caribbean.

description

In Eunephrops, the rostrum has lateral and ventral thorns, but no thorns on the back. The carapace is irregularly scattered with small nodules. In smaller individuals the carapace can be slightly hairy, that of larger individuals is hairless.

The somites of the abdomen each have a more or less pronounced, transverse depression on the back, which is interrupted in the middle. The pleuron of the second somite overlaps that of both the first and the third. The telson is roughly square, the lateral edges have an irregular toothing.

The large scissors on the first pair of striding legs are the same in size and shape. Ischium to Dactylus have pointed ridges. There are very small scissors on the second and third pair of legs. The pairs of striding legs two to five can be slightly hairy.

In males, the first pair of swimming legs is hardened, while that of females is very thin and flexible. The "Appendix masculina", a kind of bracket-like appendix in males on the second pair of swimming legs, is rather elongated. The "appendices internae" are missing in both males and females.

The uropods are relatively wide, the exopodites have a complete diaeresis, a transverse depression.

Eunephrops species reach carapace lengths of 4 cm to 14 cm and a total body length of up to 30 cm.

distribution and habitat

The species of eunephrops are native to the western Atlantic, the Caribbean Sea and can be found at depths of 230 m to 824 m. The colonized substrate is mainly mud or coral gravel.

Systematics and taxonomy

The genus Eunephrops consists of the following species:

Eunephrops bairdii Smith, 1885
Eunephrops cadenasi Chace, 1939
Eunephrops luckhursti Manning, 1997
Eunephrops manningi Holthuis, 1974

Morphological differences between the species are v. a. Presence and expression of ridges and depressions on the carapace and abdomen, as well as the presence of certain dorsal spines on the carapace (submedian postcervical spines).

Sidney Irving Smith described the genus based on a female of Eunephrops bairdii , which came from a depth of 155 fathoms in the Gulf of Darién (corresponds to approx. 280 m).

Eunephrops is more closely related to the genera Nephropides and Thymopides within the lobster-like species . Together with Homarus , Metanephrops and Nephrops , Eunephrops was placed in the subfamily of the Nephropinae Dana, 1852 . The division of the lobster-like into subfamilies is no longer common.

literature

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g 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 ( PDF, 16Mb [accessed July 3, 2012]).
^ ^A ^b Raymond B. Manning : Eunephrops luckhursti, a new deep sea lobster from Bermuda (Crustacea: Decapoda: Nephropidae) . In: Proceedings of the Biological Society of Washington . tape 110 , 1997, pp. 256–262 ( full text from BioStor.org [accessed July 4, 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 978-92-5103027-1 .
↑ 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 ( PDF, 1.7 MB [accessed July 3, 2012]).
^ Sidney I. Smith: Description of a new crustacean allied to Homarus and Nephrops . In: Proceedings of the United States National Museum . tape 8 , 1885, p. 167–170 ( page 167ff; biodiversitylibrary.org [accessed on July 4, 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 ( PDF, 1.2Mb [accessed July 3, 2012]).

[Holthuis-1] ↑ ^a ^b ^c ^d ^e ^f ^g 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 ( PDF, 16Mb [accessed July 3, 2012]).

[Manning-2] A ^b Raymond B. Manning : Eunephrops luckhursti, a new deep sea lobster from Bermuda (Crustacea: Decapoda: Nephropidae) . In: Proceedings of the Biological Society of Washington . tape 110 , 1997, pp. 256–262 ( full text from BioStor.org [accessed July 4, 2012]).

[HolthuisFAO-3] 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 978-92-5103027-1 .

[Chan-4] 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 ( PDF, 1.7 MB [accessed July 3, 2012]).

[Smith-5] Sidney I. Smith: Description of a new crustacean allied to Homarus and Nephrops . In: Proceedings of the United States National Museum . tape 8 , 1885, p. 167–170 ( page 167ff; biodiversitylibrary.org [accessed on July 4, 2012]).

[Tshudy-6] 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 ( PDF, 1.2Mb [accessed July 3, 2012]).