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Crab

The term crab is often applied to several different groups of short (nose to tail) decapods with thick exoskeletons, but only members of the Brachyura are true crabs; other taxa, such as hermit crabs, porcelain crabs, king crabs, and horseshoe crabs are, despite superficial similarities, not crabs at all. more...

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Hermit crabs, king crabs and porcelain crabs belong to the Anomala and can be distinguished from true crabs by counting the legs - in Anomala, the last pair of pereiopods (walking legs) is hidden inside the carapace and so only four pairs are visible (counting the claws), whereas uninjured true crabs always have five visible pairs.

True crabs

True crabs are crustaceans in the infraorder Brachyura, in the order Decapoda. They have five pairs of walking legs (the first of which is modified into a pair of claws or chelae) and typically a flattened shell. In all but a few crabs (for example, Raninoida), the abdomen is folded under the cephalothorax. The form of the abdomen usually reveals the sex of the crab - males have a narrow abdomen, while females have a much wider abdomen, under which they carry their eggs. Crabs are a very diverse group, mostly found in salt water, but with some groups living in freshwater or on land. Although famed for their tendency to walk sideways, crabs are in fact able to walk in any direction. Classification within the crabs is traditionally based on the position of the gonopores: whether they are found on the legs or on the thorax. In the two "primitive" sections (sometimes called collectively the "Podotremata"), the gonopores are found on the legs (as in all other decapods); in the Heterotremata, the male gonopores are on the legs, and the female gonopores are on the sternum; in the Thoracotremata, the gonopores are on the sternum in both males and females.

Sexual dimorphism

Most crabs show clear sexual dimorphism and so can be easily sexed. The abdomen, which is held recurved under the thorax, is narrow in males. In females, however, the abdomen is considerably wider, and retains a greater number of pleopods. This relates to the carrying of the fertilised eggs by the female crabs (as seen in all pleocyemates). In those species in which no such dimorphism is found, the position of the gonopores must be used instead. In females, these are on the third pereiopod, or nearby on the sternum in higher crabs; in males, the gonopores are at the base of the fifth pereiopods or, in higher crabs, on the sternum nearby.

Other animals

A number of animals with a similar shape are commonly called crabs, including the crab louse (an insect) and the horseshoe crab (in the class Merostomata). The crab louse is the origin of the slang term "crabs" for an infestation of pubic lice.

Superfamilies

  • Bellioidea
  • Bythograeoidea
  • Calappoidea
  • Cancroidea
  • Cryptochiroidea
  • Cyclodorippoidea
  • Dorippoidea
  • Dromioidea
  • Gecarcinucoidea
  • Grapsoidea
  • Homolodromioidea
  • Homoloidea
  • Hymenosomatoidea
  • Leucosioidea
  • Majoidea
  • Ocypodoidea
  • Parthenopoidea
  • Pinnotheroidea
  • Portunoidea
  • Potamoidea
  • Pseudothelphuspoidea
  • Raninoidea
  • Retroplumoidea
  • Xanthoidea

Read more at Wikipedia.org


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Arthropod Crustacea (Lobster Fossil) Thalasssina Anomola Pleisto., Belmunda, QldArthropod Crustacea (Lobster Fossil) Thalasssina Anomola Pleisto., Belmunda, Qld $600.00 Rare Fossilized Fossil CrabRare Fossilized Fossil Crab $150.00
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Fossil Crab From Indonesia In Matrix Crustacean FossilFossil Crab From Indonesia In Matrix Crustacean Fossil $160.00 Crab fossils from the Cretaceous period Yangjiang, GuangdongCrab fossils from the Cretaceous period Yangjiang, Guangdong $34.90
Double Florida Fossil Crabs in Matrix Ranilia Pliocene Crustacean with EchinoidDouble Florida Fossil Crabs in Matrix Ranilia Pliocene Crustacean with Echinoid $399.99 crab fossil concretions pulalius vulgaris Washington Statecrab fossil concretions pulalius vulgaris Washington State $100.00
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Florida Fossil Crab Ranilia muriceta Pliocene Age Crustacean RareFlorida Fossil Crab Ranilia muriceta Pliocene Age Crustacean Rare $39.99 1Pc Crab fossils from the Cretaceous period. Paleontological fossil specimens1Pc Crab fossils from the Cretaceous period. Paleontological fossil specimens $12.99
Rare Harpactocarcinus punctulatus Mud Crab Fossil.Rare Harpactocarcinus punctulatus Mud Crab Fossil. $3,500.00 B27 Fossil Crab, Glyphithyreus Wetherell, Eocene Island Of Sheppey UkB27 Fossil Crab, Glyphithyreus Wetherell, Eocene Island Of Sheppey Uk $9.67
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Vulgaris Pulalius Crab FossilVulgaris Pulalius Crab Fossil $125.00 Horseshoe Crab Arthropod Sealife Toy Model Figure by CollectA 88905 NewHorseshoe Crab Arthropod Sealife Toy Model Figure by CollectA 88905 New $18.61
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Horseshoe Crab Tachypleus syriacus - 3D Head Excellent Quality - Fossils LebanonHorseshoe Crab Tachypleus syriacus - 3D Head Excellent Quality - Fossils Lebanon $1,000.00 Very Rare horseshoe crab armour fossil arthropod when molting not Mazon CreekVery Rare horseshoe crab armour fossil arthropod when molting not Mazon Creek $66.00
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