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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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Antique Print-Crustacean-Arthropo d-Horseshoe Crab-Louse-Limulus-Pl. Xx-Oken-1833Antique Print-Crustacean-Arthropo d-Horseshoe Crab-Louse-Limulus-Pl. Xx-Oken-1833 $46.00 Beautifully Crafted 3D Horseshoe Crab Arthropod Figurine Paperweight Sea DecorBeautifully Crafted 3D Horseshoe Crab Arthropod Figurine Paperweight Sea Decor $9.99
Hermit Crab Hut - Arthropod'S Coconut Hide - Spacious Coco Tunnel - Maximum PrivHermit Crab Hut - Arthropod'S Coconut Hide - Spacious Coco Tunnel - Maximum Priv $13.99 Battle Beasts Laser Beasts Arthropod American madeBattle Beasts Laser Beasts Arthropod American made $30.00
Trilobite Sterling Silver Fossil Pendant Cast Jewlery Necklace Handmade UniqueTrilobite Sterling Silver Fossil Pendant Cast Jewlery Necklace Handmade Unique $144.00 hsc1 Taxidermy Lg Horseshoe Crab collectible specimen oddities curiosities decorhsc1 Taxidermy Lg Horseshoe Crab collectible specimen oddities curiosities decor $24.99
Amazing Arthropod, Crustacean, Crab Fossil From Java, Indonesia, 29MmAmazing Arthropod, Crustacean, Crab Fossil From Java, Indonesia, 29Mm $23.88 Trilobite Fossil and Cast - #1803 - 2.0" specimenTrilobite Fossil and Cast - #1803 - 2.0" specimen $12.95
2018 Coconut Crab - Titanium Coin in Box with Coa British Indian Ocean Territory2018 Coconut Crab - Titanium Coin in Box with Coa British Indian Ocean Territory $59.00 New ListingSunGrow Hermit Crab Huts, 5x3 Inches, Arthropod's Coconut Hide, Spacious Coco.New ListingSunGrow Hermit Crab Huts, 5x3 Inches, Arthropod's Coconut Hide, Spacious Coco. $14.59
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Spider web Silver Pendant Charm Good Luck ~ Lucky Symbol Gothic Necklace AntiqueSpider web Silver Pendant Charm Good Luck ~ Lucky Symbol Gothic Necklace Antique $1.99 Amazing Arthropod, Crustacean, Crab Fossil Matrix, From Java, Indonesia, 35MmAmazing Arthropod, Crustacean, Crab Fossil Matrix, From Java, Indonesia, 35Mm $38.59
New CollectA 88905 Prehistoric Horseshoe Crab Arthropod Model age of DinosaurNew CollectA 88905 Prehistoric Horseshoe Crab Arthropod Model age of Dinosaur $10.62 Trilobite Elrathia Fossil Mineral Sea Life Wheeler Shale Specimen w/ Id CardTrilobite Elrathia Fossil Mineral Sea Life Wheeler Shale Specimen w/ Id Card $2.95
Kolihapeltis chlupaci Trilobite from Djebel Oufaten, Morocco (302.3 grams)Kolihapeltis chlupaci Trilobite from Djebel Oufaten, Morocco (302.3 grams) $840.00 Horseshoe Crab Arthropod Sealife Toy Model Figure by CollectA 88905 New for 2020Horseshoe Crab Arthropod Sealife Toy Model Figure by CollectA 88905 New for 2020 $15.64
Hsc5 Med Real Horseshoe Crab Shell legs shell specimen Curiosities odditiesHsc5 Med Real Horseshoe Crab Shell legs shell specimen Curiosities oddities $19.99 Q65C Taxidermy Horseshoe Crab Collectible Shadow Box Disply Specimen CuriositiesQ65C Taxidermy Horseshoe Crab Collectible Shadow Box Disply Specimen Curiosities $109.99
Psychopyge elegans Trilobite from Morocco (758 grams)Psychopyge elegans Trilobite from Morocco (758 grams) $7,000.00 Hsc14 Damaged 7-9" Taxidermy Horseshoe Crab display oddities curiosities decorHsc14 Damaged 7-9" Taxidermy Horseshoe Crab display oddities curiosities decor $15.99
Eco-friendly Hermit Crab hut - Pet-safe arthropod's hideout - Natural, spaciousEco-friendly Hermit Crab hut - Pet-safe arthropod's hideout - Natural, spacious $4.68 Hsc3 Deformed Lg Real Horseshoe Crab shell specimen Curiosities oddities DisplayHsc3 Deformed Lg Real Horseshoe Crab shell specimen Curiosities oddities Display $21.99
5pcs Spider Scorpion Silver Pendant Charm Good Luck Bracelet Set Jewelry Gothic5pcs Spider Scorpion Silver Pendant Charm Good Luck Bracelet Set Jewelry Gothic $2.99 Hermit Crab Hut, 5 x 3 Inches, Arthropod's Hideout, Raw and Natural Coco TunnelHermit Crab Hut, 5 x 3 Inches, Arthropod's Hideout, Raw and Natural Coco Tunnel $10.37
Harmony Kingdom - Treasure Jests - To Catch A Thief (Robber Crab)Harmony Kingdom - Treasure Jests - To Catch A Thief (Robber Crab) $99.99 2017 Canada S$20 Ancient Canada: Ogygopsis Early Release Ngc Ms70 Antiqued2017 Canada S$20 Ancient Canada: Ogygopsis Early Release Ngc Ms70 Antiqued $109.95
Arthropods Laminated Educational Science Teacher Classroom Chart Poster 24x36Arthropods Laminated Educational Science Teacher Classroom Chart Poster 24x36 $14.99 Eco-friendly Hermit Crab hut- Pet-safe arthropod's hideout spacious Coco tunnelEco-friendly Hermit Crab hut- Pet-safe arthropod's hideout spacious Coco tunnel $13.58
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 Steuben Glass Crab Crustacea Arthropod in Shell Large Claws - Signed - Ex CondSteuben Glass Crab Crustacea Arthropod in Shell Large Claws - Signed - Ex Cond $1,495.00
Ceratarges Spinosus Trilobite from Morocco (332.6 grams)Ceratarges Spinosus Trilobite from Morocco (332.6 grams) $1,500.00 $2,000.00
SunGrow Hermit Crab Huts, 5x3 Inches, Arthropod's Coconut Hide, Spacious Coco.SunGrow Hermit Crab Huts, 5x3 Inches, Arthropod's Coconut Hide, Spacious Coco. $18.99 Trilobite Itagnostus Fossil Mineral Sea Life Wheelr Shale Specimen w/ Id CardTrilobite Itagnostus Fossil Mineral Sea Life Wheelr Shale Specimen w/ Id Card $2.95
Hsc12 Damaged Taxidermy Horseshoe Crab display collectible oddities curiositiesHsc12 Damaged Taxidermy Horseshoe Crab display collectible oddities curiosities $14.99
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Prices current as of last update, 10/26/20 8:21pm.

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