Astacidea

Description

The Astacidea are distinguished from most other decapods by the presence of chelae (claws) on each of the first three pairs of pereiopods (walking legs), the first of which is much larger than the remaining two pairs. The last two pairs of pereiopods are simple (without claws), except in Thaumastocheles, where the fifth pereiopod may have "a minute pincer".

Distribution

Members of the infraorder Astacidea are found throughout the world – both in the oceans and in fresh water – except for mainland Africa and parts of Asia.

Classification

Astacidea belongs to the group Reptantia, which consists of the walking/crawling decapods (lobsters and crabs). Astacidea is the sister clade to the infraorder Polychelida, a small group of crustaceans restricted to deep waters. The cladogram below shows Astacidea's placement within the larger order Decapoda, from analysis by Wolfe et al., 2019.

The infraorder Astacidea comprises four extant superfamilies, two of crayfish (Astacoidea and Parastacoidea), one of true lobsters (Nephropoidea), one of reef lobsters (the genus Enoplometopus), and a number of fossil taxa. , the group contains 782 recognised species, over 400 of which are in the crayfish family Cambaridae. The members of the infraorder Glypheidea (containing numerous fossils and the two extant species Neoglyphea inopinata and Laurentaeglyphea neocaledonica) were formerly included here.

The cladogram below shows Astacidea's internal relationships and the early split between lobsters and crayfish:

Taxonomy

• Palaeopalaemonoidea †
  1. Palaeopalaemonidae †
• Enoplometopoidea
  1. Enoplometopidae
  2. Uncinidae †
• Nephropoidea
  1. Chilenophoberidae †
  2. Nephropidae
  3. Protastacidae †
  4. Stenochiridae †
• Astacoidea
  1. Astacidae
  2. Cambaridae
  3. Cambaroididae
  4. Cricoidoscelosidae †
• Parastacoidea
  1. Parastacidae

References

References

1. Gary Poore. (2004). "Marine Decapod Crustacea of Southern Australia: a Guide to Identification". [[CSIRO Publishing]].
2. Lipke Holthuis. (1991). "FAO species catalogue Vol. 13: Marine Lobsters of the World". [[Food and Agriculture Organization]].
3. J. K. Lowry. (October 2, 1999). "Astacidea (Decapoda, Eucarida, Malacostraca)". Australian Museum.
4. (2014). "Advances in Freshwater Decapod Systematics and Biology". BRILL.
5. (24 April 2019). "A phylogenomic framework, evolutionary timeline and genomic resources for comparative studies of decapod crustaceans". Proceedings of the Royal Society B.
6. (2009). "A classification of living and fossil genera of decapod crustaceans". [[Raffles Bulletin of Zoology]].
7. (2017). "An updated classification of the freshwater crayfishes (Decapoda: Astacidea) of the world, with a complete species list". Journal of Crustacean Biology.
8. (July 2014). "The Emergence of Lobsters: Phylogenetic Relationships, Morphological Evolution and Divergence Time Comparisons of an Ancient Group (Decapoda: Achelata, Astacidea, Glypheidea, Polychelida)". [[Systematic Biology]].