Thalassinidea

from Wikipedia, the free encyclopedia

The division of living beings into systematics is a continuous subject of research. Different systematic classifications exist side by side and one after the other. The taxon treated here has become obsolete due to new research or is not part of the group systematics presented in the German-language Wikipedia.

Acanthaxius hirsutimanus
Pestarella tyrrhena

The Thalassinidea , also called mole crabs , were a paraphyletic suborder of the decapod , which was replaced on the basis of phylogenetic investigations by the suborders Axiidea and Gebiidea . Differences in larval development , in the structure of the gizzard and in the expression of the scissors on the second pair of striding legs support this differentiation.

distribution and habitat

Thalassinidea live worldwide in temperate, subtropical and tropical seas at depths of 0 to 2000 meters, with the great majority of the species not being found below 200 meters. The range extends between the latitudes 70 ° N and 55 ° S, with the number of species decreasing with greater latitudes.

Crabs of this suborder almost always live extremely hidden in self-dug, sometimes highly complex cave systems in the mud or sandy soil. With this bioturbation , they have a major impact on the sediments and geochemistry of the sea floor. Fossil burial tunnels of this order are called Thalassinoides .

features

Species of the Thalassinidea are outwardly similar to the crayfish (Astacidae). The body is usually cylindrical with an elongated pleon . The rostrum can be rudimentary or flat and wide. The telson has no cross seam. The first pair of striding legs is always a cheliped (carrying scissors), the second often has scissors, the third never. Their way of life required some morphological adaptations, including movable Branchiostegite (lateral edges of the carapace ) in order to be able to supply fresh water to the gills underground.

Systematics

The Thalassinidea were divided into the following superfamilies and families:

swell

  • SA Fosså, & AJ Nilsen: Coral reef aquarium. Volume 6, Birgit Schmettkamp Verlag, Bornheim 1998, ISBN 3-928819-18-6 .
  • Alfred Kaestner: Textbook of special zoology . Ed .: Hans-Eckhard Gruner. 4th edition. tape 1 : invertebrates; 4th part: Arthropoda (without Insecta). Gustav Fischer Verlag, Jena Stuttgart New York 1993, ISBN 3-334-60404-7 , p. 996 f .

Individual evidence

  1. ↑ 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 . Supplement No. 21. 2009, p. 1–109 ( edu.sg [PDF; 7,8 MB ; accessed on February 27, 2012]).
  2. ↑ a b R. Robles, CC Tudge , PC Dworschak, GCB Poore, DL Felder: Molecular phylogeny of the Thalassinidea based on nuclear and mitochondrial genes . In: JW Martin, KA Crandall, DL Felder (Ed.): Decapod Crustacean Phylogenetics (=  Crustacean Issues ). tape 18 . CRC Press, 2009, p. 309-326 .
  3. ^ A b Peter Dworschak: Biology of Mediterranean and Caribbean Thalassinidea . In: A. Tamaki (Ed.): Proceedings of the Symposium on "Ecology of large bioturbators in tidal flats and shallow sublittoral sediments - from individual behavior to their role as ecosystem engineers" . Nagasaki 2004, p. 15–22 ( nhm-wien.ac.at [PDF; 2.0 MB ; accessed on February 28, 2012]).
  4. ↑ Joel W. Martin, George E. Davis: An Updated Classification of the Recent Crustacea . Ed .: Natural History Museum of Los Angeles (=  Science Series . Volume 39 ). 2001, p. 124 ( nhm.org [PDF; 756 kB ; accessed on February 18, 2012]).

Web links

Commons : Gebiidea  - collection of images, videos and audio files
Commons : Axiidea  - collection of images, videos and audio files