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Decapoda

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Title: Decapoda  
Author: World Heritage Encyclopedia
Language: English
Subject: Crustacean, Caridea, Malacostraca, Shrimp, Aciculopoda
Collection: Decapods, Devonian First Appearances, Malacostraca
Publisher: World Heritage Encyclopedia
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Decapoda

Decapoda
Temporal range: Devonian–recent
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"Decapoda" from Ernst Haeckel's Kunstformen der Natur, 1904
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Malacostraca
Superorder: Eucarida
Order: Decapoda
Latreille, 1802
Suborders

Dendrobranchiata
Pleocyemata
See text for superfamilies.

The decapoda or decapods (literally "ten-footed") are an order of crustaceans within the class Malacostraca, including many familiar groups, such as crayfish, crabs, lobsters, prawns and shrimp. Most decapods are scavengers. The order is estimated to contain nearly 15,000 species in around 2,700 genera, with around 3,300 fossil species.[1] Nearly half of these species are crabs, with the shrimp (about 3000 species) and Anomura (including hermit crabs, porcelain crabs, squat lobsters (about 2500 species) making up the bulk of the remainder.[1] The earliest fossil decapod is the Devonian Palaeopalaemon.[2]

Contents

  • Anatomy 1
  • Classification 2
  • See also 3
  • References 4
  • External links 5

Anatomy

As the name Decapoda (from the chelae, so those legs may be called chelipeds. Further appendages are found on the abdomen, with each segment capable of carrying a pair of biramous pleopods, the last of which form part of the tail fan (together with the telson) and are called uropods.

Classification

Classification within the order Decapoda depends on the structure of the gills and legs, and the way in which the larvae develop, giving rise to two suborders: Dendrobranchiata and Pleocyemata. The Dendrobranchiata consist of prawns, including many species colloquially referred to as "shrimp", such as the "white shrimp", Litopenaeus setiferus. The Pleocyemata include the remaining groups, including "true shrimp".[3] Those groups which usually walk rather than swim (Pleocyemata, excluding Stenopodidea and Caridea) form a clade called Reptantia.[4]

This classification to the level of superfamilies follows De Grave et al.[1]

Whiteleg shrimp, Litopenaeus vannamei (Dendrobranchiata: Penaeoidea)
California spiny lobster, Panulirus interruptus (Achelata: Palinuridae)
Atlantic blue crab, Callinectes sapidus (Brachyura: Portunoidea)

Order Decapoda Latreille, 1802

See also

References

  1. ^ a b c Sammy De Grave, N. Dean Pentcheff, Shane T. Ahyong; et al. (2009). "A classification of living and fossil genera of decapod crustaceans" (PDF).  
  2. ^ Robert P. D. Crean (November 14, 2004). "Order Decapoda: Fossil record and evolution".  
  3. ^ Elena Mente (2008). Reproductive Biology of Crustaceans: Case Studies of Decapod Crustaceans.  
  4. ^ G. Scholtz & S. Richter (1995). "Phylogenetic systematics of the reptantian Decapoda (Crustacea, Malacostraca)".  

External links

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