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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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Amazing Ammonite! Arthropod, Crustacean Crab Fossil, From Java, Indonesia, 43MmAmazing Ammonite! Arthropod, Crustacean Crab Fossil, From Java, Indonesia, 43Mm $18.18 Vintage Brass Articulated Crab Ashtray Patina Mcm Solid Crustacean ArthropodVintage Brass Articulated Crab Ashtray Patina Mcm Solid Crustacean Arthropod $39.99
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 Double Charybdis Complete Fossil Crabs in Matrix, Miocene, Indonesia – 100%Double Charybdis Complete Fossil Crabs in Matrix, Miocene, Indonesia – 100% $882.72
Rare ! Undescribed Mississipian horseshoe crab older than Mazon Creek pos & negRare ! Undescribed Mississipian horseshoe crab older than Mazon Creek pos & neg $69.00 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
Fossil Crab From Indonesia In Matrix Crustacean FossilFossil Crab From Indonesia In Matrix Crustacean Fossil $160.00 Simulation Cooked Crab Models Cooked Crab Props Photo Props Fish Tank DecorSimulation Cooked Crab Models Cooked Crab Props Photo Props Fish Tank Decor $15.63
Horseshoe Crab 7-9" Taxidermy display collectible specimen nautical craftHorseshoe Crab 7-9" Taxidermy display collectible specimen nautical craft $29.99 Horseshoe Crab Arthropod Sealife Toy Model Figure by CollectA 88905 NewHorseshoe Crab Arthropod Sealife Toy Model Figure by CollectA 88905 New $17.25
Rare Complete Spiny Charybdis (Fossilized Crab) - IndonesiaRare Complete Spiny Charybdis (Fossilized Crab) - Indonesia $570.00 Real Crab Fossil inside Nodule From Central JavaReal Crab Fossil inside Nodule From Central Java $250.00
Marrella Arthropod Lace crab Rubber Realistic Toy Figure Gift 3" Ch491Bb154Marrella Arthropod Lace crab Rubber Realistic Toy Figure Gift 3" Ch491Bb154 $7.59 hsc17 Horseshoe Crab 12" Taxidermy display ocean aquatic nautical craft marinehsc17 Horseshoe Crab 12" Taxidermy display ocean aquatic nautical craft marine $29.99
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 SunGrow Hermit Crab Huts, 5x3 Inches, Arthropod's Coconut BrownSunGrow Hermit Crab Huts, 5x3 Inches, Arthropod's Coconut Brown $18.74
$33.88 Trilobite Specimen Fossil Mineral Kainops Devonian Sea Life Oklahoma RareTrilobite Specimen Fossil Mineral Kainops Devonian Sea Life Oklahoma Rare $89.99
Huge 11 cm horseshoe crab molt hash - Mazon Creek - both sides nodule - IlHuge 11 cm horseshoe crab molt hash - Mazon Creek - both sides nodule - Il $1,400.00 Smal Horshoe CrabSmal Horshoe Crab $15.00
Horseshoe crab 5-7" Horseshoe Crab Ocean display collectible specimenHorseshoe crab 5-7" Horseshoe Crab Ocean display collectible specimen $25.99 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
Hollardops Mesacristata Trilobite from Morocco (285.8 grams)Hollardops Mesacristata Trilobite from Morocco (285.8 grams) $600.00 Crab Fossil Slo County California Pliocene Miocene Cast In Monterey ShaleCrab Fossil Slo County California Pliocene Miocene Cast In Monterey Shale $44.50
Acastoides Trilobite Fossil Sea Life Mineral Specimen Devonian MoroccoAcastoides Trilobite Fossil Sea Life Mineral Specimen Devonian Morocco $14.99 1.9 cm fossil horseshoe crab - Euproops - Mazon Creek - both sides nodule - Il1.9 cm fossil horseshoe crab - Euproops - Mazon Creek - both sides nodule - Il $150.00
Hsc32 Three (3) damaged horseshoe crabs oddities curiosities display craftHsc32 Three (3) damaged horseshoe crabs oddities curiosities display craft $19.99 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
Mazon Creek Fossil , Horseshoe crab , Euproops danae ! #Mc161Mazon Creek Fossil , Horseshoe crab , Euproops danae ! #Mc161 $75.00 Real Air Dried Crab Body CarapacesReal Air Dried Crab Body Carapaces $53.49
Japanese Spider Crabs: Nature's Biggest Arthropod by Walt Brody Paperback BookJapanese Spider Crabs: Nature's Biggest Arthropod by Walt Brody Paperback Book $21.56 Fossils Replica Cambrian arthropod - Marella Splendens - Burgess ShaleFossils Replica Cambrian arthropod - Marella Splendens - Burgess Shale $32.08
Large 4 cm fossil horseshoe crab - Euproops - Mazon Creek - both sides - IlLarge 4 cm fossil horseshoe crab - Euproops - Mazon Creek - both sides - Il $650.00 Fossil Crab From Indonesia With Claw Preservation - Could Be Prepped MoreFossil Crab From Indonesia With Claw Preservation - Could Be Prepped More $175.00
Robert Stanley Crab Arthropod Sea Creature Glass OrnamentRobert Stanley Crab Arthropod Sea Creature Glass Ornament $15.00 Rare Fossil Crab 3D Prepped From Indonesia, Miocene. Amazing Detail !Rare Fossil Crab 3D Prepped From Indonesia, Miocene. Amazing Detail ! $191.63
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 2.1 cm fossil horseshoe crab - Euproops danae - Mazon Creek - both sides - Il2.1 cm fossil horseshoe crab - Euproops danae - Mazon Creek - both sides - Il $250.00
W79d Horseshoe Crab Taxidermy Collectible Glass dome Display Specimen curiosityW79d Horseshoe Crab Taxidermy Collectible Glass dome Display Specimen curiosity $59.99 Q65c Horseshoe Crab Collectible Shadowbox Display Taxidermy Oddities CuriositiesQ65c Horseshoe Crab Collectible Shadowbox Display Taxidermy Oddities Curiosities $99.00
Coconut Crab, Blue, Realistic Toy Figure, Model, Replica, 4" Ch304 Bb129Coconut Crab, Blue, Realistic Toy Figure, Model, Replica, 4" Ch304 Bb129 $8.79 Coconut Crab, Realistic Toy Figure, Model, Replica, Kids, Gift, 4" Ch196 Bb117Coconut Crab, Realistic Toy Figure, Model, Replica, Kids, Gift, 4" Ch196 Bb117 $9.89
Arthropoda, Crustacean Crab Fossil From Java Indonesia, 30MmArthropoda, Crustacean Crab Fossil From Java Indonesia, 30Mm $22.99 Mazon Creek Euproops danae Horseshoe Crab Carboniferous Fossil Illinois ex MwfMazon Creek Euproops danae Horseshoe Crab Carboniferous Fossil Illinois ex Mwf $150.00
New CollectA 88905 Prehistoric Horseshoe Crab Arthropod Model age of DinosaurNew CollectA 88905 Prehistoric Horseshoe Crab Arthropod Model age of Dinosaur $9.29 W79c Taxidermy Horseshoe Crab Collectible Glass dome display oddities CuriosityW79c Taxidermy Horseshoe Crab Collectible Glass dome display oddities Curiosity $59.99
Fresh Live Dungeness crab 15 Lb Package 10 PieceFresh Live Dungeness crab 15 Lb Package 10 Piece $350.00 Funny Crab Arthropod Animal 4' X 4' Square Wooden CoasterFunny Crab Arthropod Animal 4' X 4' Square Wooden Coaster $6.30
Japanese Spider Crabs: Nature's Biggest Arthropod by Walt Brody Hardcover BookJapanese Spider Crabs: Nature's Biggest Arthropod by Walt Brody Hardcover Book $34.78 Rare nodule coprolite horseshoe crab in defensive position Not Mazon CreekRare nodule coprolite horseshoe crab in defensive position Not Mazon Creek $80.00
Rare undescribed Mississipian horseshoe crab head older than Mazon Creek fossilsRare undescribed Mississipian horseshoe crab head older than Mazon Creek fossils $51.00 Weird 1.4 cm fossil horseshoe crab - Euproops - Mazon Creek - both sides - IlWeird 1.4 cm fossil horseshoe crab - Euproops - Mazon Creek - both sides - Il $250.00
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Prices current as of last update, 01/09/25 7:21am.

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