phylum arthropoda
Crabs are not reptiles, crabs are in the Arthropoda Phylum.
The question might presume a fact not in evidence: fiddler crabs are not chordates (phylum chordata, with internal skeletons) but instead are phylum arthropoda, characterized by segmented bodies, an exoskeleton made from chitin, and joint appendages.
Fiddler crabs belong in various groups (taxa) in their biological classification: kingdom Metazoa; phylum Arthropoda; subphylum Crustacea; class Malacostraca; order Decapoda; infraorder Brachyura; family Ocypodidae; genus Uca. About a hundred species of fiddlers have been described.
by rubbing their big claw on there body
yes they are
Ghost crabs? Well that depense if it is a dead fiddler crab so it would be the same/
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no they are not
no
They're in the crustation or the crabs group.
crabs are nocturnal