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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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Lily Bloom Red Crab Novelty Crossbody Purse Excellent Condition Free ShippingLily Bloom Red Crab Novelty Crossbody Purse Excellent Condition Free Shipping $55.00 Hammered Aluminum Lobster Crab Nut Relish Tray Serving DishHammered Aluminum Lobster Crab Nut Relish Tray Serving Dish $22.50
Zoo Med Hermit Crab Sand - Green - 2 lbZoo Med Hermit Crab Sand - Green - 2 lb $3.19 The Narrow Edge: A Tiny Bird, an Ancient Crab, and an Epic JourneyThe Narrow Edge: A Tiny Bird, an Ancient Crab, and an Epic Journey $10.51
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Crab Cancer Zodiac Sign .925 Sterling Silver CharmCrab Cancer Zodiac Sign .925 Sterling Silver Charm $12.50 Sterling Silver Crab Charm (0.6in)Sterling Silver Crab Charm (0.6in) $12.99 List price:  Previous Price $32.00
Lot of 3 vintage beach sea creatures pins - crab, starfish, fish, Sarah CovLot of 3 vintage beach sea creatures pins - crab, starfish, fish, Sarah Cov $9.00 Zoo Med Hermit Crab Salt Water Conditioner - 2.25 fl ozZoo Med Hermit Crab Salt Water Conditioner - 2.25 fl oz $2.49
Zoo Med Hermit Crab "Growth" Shell - Large - 1 pkZoo Med Hermit Crab "Growth" Shell - Large - 1 pk $2.49 Coastal Nautical Red Crab Metal Single Hook Towel Wall Hanger Park DesignsCoastal Nautical Red Crab Metal Single Hook Towel Wall Hanger Park Designs $11.58
Vintage Shower Curtain Sea Animals Theme Crabs Print for Bathroom 84" ExtralongVintage Shower Curtain Sea Animals Theme Crabs Print for Bathroom 84" Extralong $39.99 6pcs wholesale lots real insect gold crab big mix design paperweight6pcs wholesale lots real insect gold crab big mix design paperweight $27.99 Was:  Previous Price $39.99
Byers Choice Cape Cod Santa Claus Holding Crabs 2011 Signed Joyce *Byers Choice Cape Cod Santa Claus Holding Crabs 2011 Signed Joyce * $89.99 Was:  Previous Price $99.99 Baby Boy Girl Kids Bibs Waterproof Saliva Towel Cartoon Burp Feeding Bandana NtBaby Boy Girl Kids Bibs Waterproof Saliva Towel Cartoon Burp Feeding Bandana Nt $0.99 to $1.98
Embroidered Cushion Pillow Cover Marine Art Throw Pillow Blue CrabEmbroidered Cushion Pillow Cover Marine Art Throw Pillow Blue Crab $19.95 X3 Yugioh Performapal Sellshell Crab Shvi-En002 Common 1St In HandX3 Yugioh Performapal Sellshell Crab Shvi-En002 Common 1St In Hand $1.30
Wood Disk Crab OctopusWood Disk Crab Octopus $2.99 Tiki Cat Canned Food for Cats, Lanai Tuna Crab Recipe Pack of 12 2.8-Ounce CansTiki Cat Canned Food for Cats, Lanai Tuna Crab Recipe Pack of 12 2.8-Ounce Cans $23.98
New Rare Editions Girls "Bright Beach Ball Crab" Size 4 Top Shorts Outfit NwtNew Rare Editions Girls "Bright Beach Ball Crab" Size 4 Top Shorts Outfit Nwt $19.46 Was:  Previous Price $22.90 11 Cholla Fish Reptiles Crabs Birds Craft Perch11 Cholla Fish Reptiles Crabs Birds Craft Perch $32.00
Zoo Med Hermit Crab Scooper - AssortedZoo Med Hermit Crab Scooper - Assorted $2.49 15135*25Pcs Silver Vintage Animal Crab Pendant Charm Alloy Antique15135*25Pcs Silver Vintage Animal Crab Pendant Charm Alloy Antique $5.25
Wholesale 10pcs Tibet Silver Crab Charm Pendant Beaded Jewelry Findings New DiyWholesale 10pcs Tibet Silver Crab Charm Pendant Beaded Jewelry Findings New Diy $0.01 Zoo Med Hermit Crab Mineral Blocks - 3 pkZoo Med Hermit Crab Mineral Blocks - 3 pk $1.49
Zoo Med Starter Hermit Crab KitZoo Med Starter Hermit Crab Kit $16.99 Maldives 2017 Crabs And Lobsters Sheet Mint NhMaldives 2017 Crabs And Lobsters Sheet Mint Nh $14.95
Fishing Bait Trap Cast Dip Net Cage Crab Fish Minnow Crawdad Shrimp Foldable TsuFishing Bait Trap Cast Dip Net Cage Crab Fish Minnow Crawdad Shrimp Foldable Tsu $2.33 to $4.84 Ty Beanie Buddy Digger the Orange Crab 1999(310-323)Ty Beanie Buddy Digger the Orange Crab 1999(310-323) $14.00
Cheryl M Sterling Silver 18in W/ Rho-plated Cz Freshwater Crab Pearl NecklaceCheryl M Sterling Silver 18in W/ Rho-plated Cz Freshwater Crab Pearl Necklace $42.99 List price:  Previous Price $80.00 Collectable Handwork Decorative Inside Amber Inlay Vivid Crab Auspicious PendantCollectable Handwork Decorative Inside Amber Inlay Vivid Crab Auspicious Pendant $1.84
Betsey Johnson Colorful enamel Pretty crab Necklace earring set#263TBetsey Johnson Colorful enamel Pretty crab Necklace earring set#263T $1.04 Lauren Conrad Women's Crab Flip Flops size 10Lauren Conrad Women's Crab Flip Flops size 10 $5.00
Topical hoard breakup 50 crustacean,crab,lobster!M ixed condition,few duplicatesTopical hoard breakup 50 crustacean,crab,lobster!M ixed condition,few duplicates $9.99 Crab Cookie Cutter 5 in. B1355Crab Cookie Cutter 5 in. B1355 $6.79
Vintage Retro Crab In Resin Lamp With Amazing Spun Fiberglass Shade WorkingVintage Retro Crab In Resin Lamp With Amazing Spun Fiberglass Shade Working $98.20 (cto1176) 5x cto Crab, Small lot, Lobster, Comoros(cto1176) 5x cto Crab, Small lot, Lobster, Comoros $1.75
Set Of 10 Assorted Small Hermit Crab Seashells 1/2" To 1"-Set 28Set Of 10 Assorted Small Hermit Crab Seashells 1/2" To 1"-Set 28 $6.95 Maldives 2017 Crabs And Lobsters Souvenir Sheet Mint NhMaldives 2017 Crabs And Lobsters Souvenir Sheet Mint Nh $14.95
Zoo Med Hermit Crab Sea SpongeZoo Med Hermit Crab Sea Sponge $1.89 Progressive Seafood Scissors Cut Crack & Devein Crab Shrimp Lobster 4-PackProgressive Seafood Scissors Cut Crack & Devein Crab Shrimp Lobster 4-Pack $31.78
Nautical Shower Curtain Cute Crabs on Striped Print for Bathroom 84" ExtralongNautical Shower Curtain Cute Crabs on Striped Print for Bathroom 84" Extralong $39.99 Zoo Med All Natural Hermit Crab Sea SpongeZoo Med All Natural Hermit Crab Sea Sponge $1.89
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Prices current as of last update, 03/20/18 1:00pm.

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