Decapoda

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Decapoda
Temporal range: Devonian–recent
Haeckel Decapoda.jpg
"Decapoda" from Ernst Haeckel's Kunstformen der Natur, 1904
Scientific classification e
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]

Anatomy[edit]

As the name Decapoda (from the Greek δέκα, deca-, "ten", and πούς / ποδός, -pod, "foot") implies, all decapods have what are considered ten legs, in the form of five pairs of thoracic appendages on the last five thoracic segments. Decapods can have as many as twenty appendages, arranged in one pair per body segment. The front three pairs function as mouthparts and are generally referred to as maxillipeds; the remainder is pereiopods. In many decapods, however, one pair of "legs" has enlarged pincers; the claws are called chelae, so those legs may be called chelipeds. The remaining 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[edit]

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[edit]

References[edit]

  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). Raffles Bulletin of Zoology. Suppl. 21: 1–109. Archived from the original (PDF) on 2011-06-06. 
  2. ^ Robert P. D. Crean (November 14, 2004). "Order Decapoda: Fossil record and evolution". University of Bristol. Retrieved January 2, 2010. 
  3. ^ Elena Mente (2008). Reproductive Biology of Crustaceans: Case Studies of Decapod Crustaceans. Science Publishers. p. 16. ISBN 978-1-57808-529-3. 
  4. ^ G. Scholtz; S. Richter (1995). "Phylogenetic systematics of the reptantian Decapoda (Crustacea, Malacostraca)". Zoological Journal of the Linnean Society. 113 (3): 289–328. doi:10.1006/zjls.1995.0011. 

External links[edit]

Moana's Shiny (2016)

Disney Mention[edit]

In the Disney movie "Moana", a monster-sized crab named Tamotoa claims that Maui, a demigod can't be expected to beat a decapod. After saying the word Decapod, he whispers "look it up". This intervention by Tamotoa ends being somewhat ironic, because "Decapoda" literally means "ten footed", and Tamotoa had one cut off by Maui (leaving a total of 9 foot), who he claims too weak to beat him. In the end, these words have an implicit comic intention. It's not the only implicitly comic remark: he also says "I will sparkle like a diamond in the rough, which is actually coal.

[1]

  1. ^ https://en.wikipedia.org/wiki/Moana_(2016_film)