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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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Double Charybdis Complete Fossil Crabs in Matrix, Miocene, Indonesia – 100%Double Charybdis Complete Fossil Crabs in Matrix, Miocene, Indonesia – 100% $1,028.33 Crab Fossil Slo County California Pliocene Miocene Cast In Monterey ShaleCrab Fossil Slo County California Pliocene Miocene Cast In Monterey Shale $44.50
Ancient Creatures Series Megarachne Plush Toy 41cm 6358Ancient Creatures Series Megarachne Plush Toy 41cm 6358 $49.70 Real Air Dried Crab Body CarapacesReal Air Dried Crab Body Carapaces $53.49
Vintage Brass Articulated Crab Ashtray Patina Mcm Solid Crustacean ArthropodVintage Brass Articulated Crab Ashtray Patina Mcm Solid Crustacean Arthropod $39.99 New CollectA 88905 Prehistoric Horseshoe Crab Arthropod Model age of DinosaurNew CollectA 88905 Prehistoric Horseshoe Crab Arthropod Model age of Dinosaur $9.31
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3D Carboniferous fossil horseshoe crab prosoma head with spins not Mazon Creek3D Carboniferous fossil horseshoe crab prosoma head with spins not Mazon Creek $64.00 Robert Stanley Crab Arthropod Sea Creature Glass OrnamentRobert Stanley Crab Arthropod Sea Creature Glass Ornament $15.00
Hsc8 Horseshoe Crab 19+ Damaged shell Oddities Curiosities specimen nautical lgHsc8 Horseshoe Crab 19+ Damaged shell Oddities Curiosities specimen nautical lg $34.99 Japanese Spider Crabs: Nature's Biggest Arthropod by Walt Brody Hardcover BookJapanese Spider Crabs: Nature's Biggest Arthropod by Walt Brody Hardcover Book $47.56
Funny Crab Arthropod Animal | 4' X 4' Round Decorative MagnetFunny Crab Arthropod Animal | 4' X 4' Round Decorative Magnet $5.80 Trilobite Itagnostus Specimen Fossil Mineral Sea Life Wheelr Shale w/ Id CardTrilobite Itagnostus Specimen Fossil Mineral Sea Life Wheelr Shale w/ Id Card $5.99
Hermit Crab Huts, 5X3 Inches, Arthropod'S Coconut Hide, Spacious Coco Tunnel, UsHermit Crab Huts, 5X3 Inches, Arthropod'S Coconut Hide, Spacious Coco Tunnel, Us $13.38 Penn Plax Hermit Crab Kit Complete Habitat Crabs- Reptiles- Amphibians- SpidersPenn Plax Hermit Crab Kit Complete Habitat Crabs- Reptiles- Amphibians- Spiders $15.00
Coconut Crab, Blue, Realistic Toy Figure, Model, Replica, 4" Ch304 Bb129Coconut Crab, Blue, Realistic Toy Figure, Model, Replica, 4" Ch304 Bb129 $8.79 Extinctions- Large Mazon Creek Split Pair Euproops Crab Fossil - Found In Shale!Extinctions- Large Mazon Creek Split Pair Euproops Crab Fossil - Found In Shale! $499.99
Rare undescribed Mississipian horseshoe crab head older than Mazon Creek fossilsRare undescribed Mississipian horseshoe crab head older than Mazon Creek fossils $51.00 Mazon Creek Euproops danae Horseshoe Crab Carboniferous Fossil Illinois ex MwfMazon Creek Euproops danae Horseshoe Crab Carboniferous Fossil Illinois ex Mwf $150.00
New ListingJapanese Spider Crabs: Nature's Biggest Arthropod by Walt Brody Hardcover BookNew ListingJapanese Spider Crabs: Nature's Biggest Arthropod by Walt Brody Hardcover Book $34.78 Horseshoe Crab 4-5" One Only taxidermy display aquatic nautical Crafts specimenHorseshoe Crab 4-5" One Only taxidermy display aquatic nautical Crafts specimen $17.99
Fossil Crab From Indonesia With Claw Preservation - Could Be Prepped MoreFossil Crab From Indonesia With Claw Preservation - Could Be Prepped More $175.00 2018 Coconut Crab - Titanium Coin in Capsule+Coa British Indian Ocean Territory2018 Coconut Crab - Titanium Coin in Capsule+Coa British Indian Ocean Territory $59.00
Funny Crab Arthropod Animal 4' X 4' Square Wooden CoasterFunny Crab Arthropod Animal 4' X 4' Square Wooden Coaster $6.30 Simulation Cooked Crab Models Cooked Crab Props Photo Props Fish Tank DecorSimulation Cooked Crab Models Cooked Crab Props Photo Props Fish Tank Decor $16.45
Horseshoe Crab 12" Taxidermy display ocean aquatic nautical craft marineHorseshoe Crab 12" Taxidermy display ocean aquatic nautical craft marine $29.99 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
Hermit Crab Starter Kit W/ Food Water Dishes Growth Shells Care Sheet & More NewHermit Crab Starter Kit W/ Food Water Dishes Growth Shells Care Sheet & More New $35.97 New ListingHuge Travertine Crab Fossil, 14cm by 9cm Fossil Travertine Crab PotamonNew ListingHuge Travertine Crab Fossil, 14cm by 9cm Fossil Travertine Crab Potamon $240.00
Hollardops Mesacristata Trilobite from Morocco (285.8 grams)Hollardops Mesacristata Trilobite from Morocco (285.8 grams) $600.00 Amazing Ammonites! Arthropod, Crustacean Crab Fossil From Java, Indonesia, 33MmAmazing Ammonites! Arthropod, Crustacean Crab Fossil From Java, Indonesia, 33Mm $19.98
Mazon Creek Fossil , Horseshoe crab , Euproops danae ! #Mc161Mazon Creek Fossil , Horseshoe crab , Euproops danae ! #Mc161 $75.00 Horseshoe crab 5-7" Horseshoe Crab Ocean display collectible specimenHorseshoe crab 5-7" Horseshoe Crab Ocean display collectible specimen $25.99
Marrella Arthropod Lace crab Rubber Realistic Toy Figure Gift 3" Ch491Bb154Marrella Arthropod Lace crab Rubber Realistic Toy Figure Gift 3" Ch491Bb154 $7.59 Rare Complete Spiny Charybdis (Fossilized Crab) - IndonesiaRare Complete Spiny Charybdis (Fossilized Crab) - Indonesia $11.50
Rare nodule coprolite horseshoe crab in defensive position Not Mazon CreekRare nodule coprolite horseshoe crab in defensive position Not Mazon Creek $80.00 Arthropoda, Crustacean Crab Fossil From Java Indonesia, 30MmArthropoda, Crustacean Crab Fossil From Java Indonesia, 30Mm $22.99
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Rare ! Undescribed Mississipian horseshoe crab older than Mazon Creek pos & negRare ! Undescribed Mississipian horseshoe crab older than Mazon Creek pos & neg $69.00
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Prices current as of last update, 01/16/25 7:35am.

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