yes, a Japanese spider crab has an oval shaped shell and a pair of compound eyes. The shell can reach 30 cm in length.
Japanese spider crab (yes, it's really an insect) Jeruselem cricket
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Yes, they are vertebrates. A vertebrate is an animal with a skeletal structure.
The Japanese spider crab is a scavenger just like all other crabs. They have 8 legs, plus two long claws for feed in the front. They usually dead animals on the ocean floor as well as shellfish. They are also known as the "dead man's crab" as they have been found feeding on drowning victims in the past. Although they are the largest crab, they are very docile despite their size.
There are crab Spiders (see first wikipedia article in related links) and there are spider crabs (see second wiki article for the most commonly referred to spider crab, the huge Japanese kind). Crab spiders are a family (as in Kingdom, Phylum, Class, Order, Family, Genus, Species), and thus a rather general type of spiders, that are very wide spread throughout the world. There a genus of spider sometimes called a crab spider that is very poisonous, and they live in the deserts of Africa (see third wiki article).
Yes, they care their young with they live.
Yes. Arthropods include insects, arachnids and crustaceans.
The symbiotic relationship is mutualism
Crustaceans, including crabs, have no spine so are therefore invertebrates. It is an invertebrate, in fact it is a crustacean as it has a hard shell and soft inside. Other crustaceans are lobsters.
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Yes, a blue crab is an omnivore. It feeds on a variety of plants and animals including algae, small fish, mollusks, and detritus.