It is neither. It is a subphylum of the Phylum Arthropoda
Arthopada is the phylum, crustacean is the class, and from there, there are many families, genus', and species'
It depends on the type of crab. For example, fiddler crabs are of the genus Uca (Ocypodidae). And the blue crab is in the genus Chionoecetes.
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Animal Kingdom, phylum Crustacea
Genus species or when writing it in hand it should be Genus species, but underlined.
A genus with one species is a monospecific genus.
Crayfish are not a single species nor do they belong to a single genus. They make up the superfamily Astacoidea, which contains three families and 29 extant genera.
The species is the combined genus and species
There are 79 species of hagfish that are split up into six different genus. The genus Eptatretus contains 49 species, the genus Myxine contains 23 species, the genus Nemamyxine contains two species, the genus Neomyxine contains one species, the genus Notomyxine contains one species, and the genus Rubicundus contains four species.
That depends on the type of crustacean in question; it varies between species.
a genus is divided into species
Genus and species are specific to each individual organism, so there is no genus species for all plants.