They have a shell to protect their back.
Crustaceans, in the phylum of the Arthropoda.
Well there's crabs, lobsters, yabbys, i think that's all.
Similarities: Daphnia and crustaceans (such as shrimp) share the same kind of "jerky" movement through a body of water. Also, like crustaceans such as lobsters and crabs, both have a hard outer shell.
A crustacean is an animal that has a hard external shell or "crust". Some crustaceans are shrimp, crabs, and lobsters.
No its a crustationcrustaceans & arachnids are both arthropods(phylum) of the kingdom animalia, but a crustacean is a subphylum, while arachnids are a class of the subphylum chelicerata, so it's like they're they're a whole different category. Crabs are a class, malacostraca, of the subphylum, crustacean. As an interesting sidenote, certain"crabs" are not crabs or crustaceans at all; e.g., horseshoe crabs are a class, merostomata, of the same subphylum, chelicerata, as the arachnids, so they are, in fact, a closer relation to arachnids than to crustaceans, kind of like cousins.CRABKingdom: AnimaliaPhylum: ArthropodaSubphylum: CrustaceaClass: MalacostracaOrder: DecapodaSuborder: PleocyemataInfraorder: BrachyuraARACHNIDKingdom: AnimaliaPhylum: ArthropodaSubphylum: ChelicerataClass: Arachnida
Crabs are omnivorous, which means that they eat both plants and animals. The main source of food for crabs is algae. Here is a list of some of the other foods they eat.WormsMolluscsFungiBacteriaOther crustaceans (including crayfish, shrimp, krill and barnacles).Detritus
The class Arachnida includes animals with four pairs of legs. So mites, scorpions, false scorpions, harvestmen and vinegarones are all in the same class as spiders. Crabs are Crustacea. The only link between them is that both classes are arthropods. Sea Spiders are in a separate class altogether.Confusion and argument has raged over the position of Horseshoe Crabs. My understanding is that they are now generally accepted as arachnids
Spiders are arachnids which are within the animal phylum of Arthropods. Some other arthropods are insects and other "bugs," crabs, lobsters, and even barnacles.
Any type of predator that is persistant. Most hermit crabs have really fantastic defense mechanisms (their shell) but large creatures capable of breaking the shell or a crab that is too big for it's shell and can be pulled on can be food for birds and other crustaceans.
Crabs in terms of the kind that you eat, and crabs in terms of the kind that are found in your pubic hair are completely different. Crabs that are found in the water and are edible are crustacians, whereas the crabs that are found in pubic hair are really a type of lice and are much more similar to the kind of lice people get in the hair on top of their head.
No, they are good to eat as long as you are not allergic to crab meat.
A weird spider