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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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2017 1 oz. Pure Silver Coin - Ancient Canada: $20 Silver Ogygopsis - S# 13892017 1 oz. Pure Silver Coin - Ancient Canada: $20 Silver Ogygopsis - S# 1389 $90.00 Ebros Coastal Giant Spider Arthropod Crab Resin Wine Bottle Holder 8"LEbros Coastal Giant Spider Arthropod Crab Resin Wine Bottle Holder 8"L $30.99
Trilobite Elrathia Fossil Mineral Sea Life Wheeler Shale Specimen w/ Id CardTrilobite Elrathia Fossil Mineral Sea Life Wheeler Shale Specimen w/ Id Card $19.95 Trilobite Itagnostus Fossil Mineral Sea Life Wheelr Shale Specimen w/ Id CardTrilobite Itagnostus Fossil Mineral Sea Life Wheelr Shale Specimen w/ Id Card $19.95
hsc11 Taxidermy Ocean Horseshoe Crab display collectible specimen oddities 7-9"hsc11 Taxidermy Ocean Horseshoe Crab display collectible specimen oddities 7-9" $21.99 Trilobite Fossil and Cast - #1804 - 2.25" specimenTrilobite Fossil and Cast - #1804 - 2.25" specimen $15.00
W79b Taxidermy Horseshoe Crab Collectible dome Disply Specimen curiosities decorW79b Taxidermy Horseshoe Crab Collectible dome Disply Specimen curiosities decor $54.99 Ceratarges Spinosus Trilobite from Morocco (332.6 grams)Ceratarges Spinosus Trilobite from Morocco (332.6 grams) $1,500.00
Amazing Arthropod, Crustacean, Crab Fossil From Java, Indonesia, 32MmAmazing Arthropod, Crustacean, Crab Fossil From Java, Indonesia, 32Mm $25.69 hsc13 Taxidermy Horseshoe Crab 5 - 6" collectible specimen oddities curiositieshsc13 Taxidermy Horseshoe Crab 5 - 6" collectible specimen oddities curiosities $18.99
Hermit Crab Hut - Arthropod'S Coconut Hide - Spacious Coco Tunnel - Maximum PrivHermit Crab Hut - Arthropod'S Coconut Hide - Spacious Coco Tunnel - Maximum Priv $14.99 fossil arthropod cyclus americanus mazon creekfossil arthropod cyclus americanus mazon creek $20.00
SunGrow Hermit Crab Huts, 5x3 Inches, Arthropod's Coconut Hide, Spacious Coco TuSunGrow Hermit Crab Huts, 5x3 Inches, Arthropod's Coconut Hide, Spacious Coco Tu $17.02 Q65e Taxidermy Horseshoe Crab Collectible Shadow Box Display Specimen odditiesQ65e Taxidermy Horseshoe Crab Collectible Shadow Box Display Specimen oddities $59.99
Asaphus intermedius Trilobite from Morocco (844.4 grams)Asaphus intermedius Trilobite from Morocco (844.4 grams) $2,000.00 Waldorf homeschool curriculum Zoology kit lot bundle Arthropods nomenclatureWaldorf homeschool curriculum Zoology kit lot bundle Arthropods nomenclature $0.99
Trilobite Sterling Silver Fossil Pendant Cast Jewlery Necklace Handmade UniqueTrilobite Sterling Silver Fossil Pendant Cast Jewlery Necklace Handmade Unique $144.00 Battle Beasts Laser Beasts Arthropod American madeBattle Beasts Laser Beasts Arthropod American made $30.00
1860 Cirripedes - Barnacles - Set of 2 Lithographs - William Mackenzie/ J.Lowry1860 Cirripedes - Barnacles - Set of 2 Lithographs - William Mackenzie/ J.Lowry $7.50 New CollectA 88905 Prehistoric Horseshoe Crab Arthropod Model age of DinosaurNew CollectA 88905 Prehistoric Horseshoe Crab Arthropod Model age of Dinosaur $11.54
Amazing Arthropod, Crustacean, Crab Fossil Matrix, From Java, Indonesia, 35MmAmazing Arthropod, Crustacean, Crab Fossil Matrix, From Java, Indonesia, 35Mm $38.59 Hsc3 Deformed Lg Real Horseshoe Crab shell specimen Curiosities oddities DisplayHsc3 Deformed Lg Real Horseshoe Crab shell specimen Curiosities oddities Display $21.99
Hsc8 large Real Horseshoe Crab Shell legs shell specimen Curiosities odditiesHsc8 large Real Horseshoe Crab Shell legs shell specimen Curiosities oddities $19.99 Beautifully Crafted 3D Horseshoe Crab Arthropod Figurine Paperweight Sea DecorBeautifully Crafted 3D Horseshoe Crab Arthropod Figurine Paperweight Sea Decor $9.99
Hsc4 Taxidermy Lg Horseshoe Crab collectible specimen oddities curiosities 16+"Hsc4 Taxidermy Lg Horseshoe Crab collectible specimen oddities curiosities 16+" $23.99 Hermit Crab Edible Shelter & Water Dish hut arthropod hideout tunnel climber eucHermit Crab Edible Shelter & Water Dish hut arthropod hideout tunnel climber euc $9.99
Arthropods Laminated Educational Science Teacher Classroom Chart Poster 24x36Arthropods Laminated Educational Science Teacher Classroom Chart Poster 24x36 $14.99 $15.42
Harmony Kingdom - Treasure Jests - To Catch A Thief (Robber Crab)Harmony Kingdom - Treasure Jests - To Catch A Thief (Robber Crab) $99.99 Kolihapeltis chlupaci Trilobite from Djebel Oufaten, Morocco (302.3 grams)Kolihapeltis chlupaci Trilobite from Djebel Oufaten, Morocco (302.3 grams) $840.00
W79 Taxidermy Horseshoe Crab Collectible Glass dome Display Specimen curiositiesW79 Taxidermy Horseshoe Crab Collectible Glass dome Display Specimen curiosities $54.99
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Prices current as of last update, 01/25/21 2:35pm.

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