Reptantia

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Reptantia
Temporal range: Devonian–recent
KreeftbijDenOsse.jpg
European lobster
(Homarus gammarus)
Scientific classification e
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Malacostraca
Order: Decapoda
Suborder: Pleocyemata
(unranked): Reptantia
Boas, 1880
Infraorders

Reptantia is a clade of decapod crustaceans named in 1880 which includes lobsters, crabs and many other well-known crustaceans.

Classification[]

In older classifications, Reptantia was one of the two sub-orders of Decapoda alongside Natantia, with Reptantia containing the walking forms, and Natantia containing the swimming forms (prawns, shrimp and boxer shrimp). However, in 1963 Martin Burkenroad found Natantia to be paraphyletic and invalid, and instead split Decapoda into the two sub-orders of Dendrobranchiata (prawns) and Pleocyemata. Pleocyemata contains all the members of the Reptantia (including crabs, lobsters, crayfish, and others), as well as the Stenopodidea ("boxer shrimp"), and Caridea (true shrimp).[1] Reptantia remains a valid monophyletic grouping, but is now no longer ranked as a sub-order.[2]

Anatomy[]

The name Reptantia means "those that walk", and contains those decapods whose primary mode of locomotion is to walk along a surface using the pereiopods rather than swimming through the water with the pleopods. Despite this, many reptants are able to propel themselves through the water, and many non-reptants can and will walk.

Systematics[]

The cladogram below shows Reptantia under the sub-order Pleocyemata within the larger order Decapoda, from analysis by Wolfe et al., 2019.[2]

Decapoda
 

Dendrobranchiata (prawns) Litopenaeus setiferus.png

 
Pleocyemata
 
 

Stenopodidea (boxer shrimp) Spongicola venustus.png

 
 
 

Procarididea

 
 

Caridea (true shrimp) Macrobrachium sp.jpg

 
 
 
Reptantia (crawling/walking decapods)
 
 

Achelata (spiny lobsters, slipper lobsters) Panulirus argus.png

 
 
 

Polychelida (benthic crustaceans)

 
 

Astacidea (lobsters, crayfish) Lobster NSRW rotated2.jpg

 
 
 
 
 

Axiidea (mud shrimp, ghost shrimp, or burrowing shrimp)

 
 
 

Gebiidea (mud lobsters and mud shrimp)

 
 
 

Anomura (hermit crabs and others) Coenobita variabilis.jpg

 
 

Brachyura (crabs) Charybdis japonica.jpg

 
 
 
 
 
 
 

Reptantia comprises the following infraorders:

  • Achelata (spiny, slipper, and furry lobsters)
  • Polychelida (benthic crustaceans)
  • Glypheidea (glypheoid lobsters)
  • Astacidea (true lobsters, reef lobsters, and crayfish)
  • Axiidea (mud lobsters and ghost shrimp)
  • Gebiidea (mud lobsters and mud shrimp)
  • Anomura (squat lobsters, hermit crabs, and relatives)
  • Brachyura (true crabs)

References[]

  1. ^ Burkenroad, M. D. (1963). "The evolution of the Eucarida (Crustacea, Eumalacostraca), in relation to the fossil record". Tulane Studies in Geology. 2 (1): 1–17.
  2. ^ a b Wolfe, Joanna M.; Breinholt, Jesse W.; Crandall, Keith A.; Lemmon, Alan R.; Lemmon, Emily Moriarty; Timm, Laura E.; Siddall, Mark E.; Bracken-Grissom, Heather D. (24 April 2019). "A phylogenomic framework, evolutionary timeline and genomic resources for comparative studies of decapod crustaceans". Proceedings of the Royal Society B. 286 (1901). doi:10.1098/rspb.2019.0079. PMC 6501934. PMID 31014217.
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