Biological classification

Biological classification

Biological classification Genus are groups of animals with similar characteristics that are very closely related. Species within a particular genus (i.e. Inachus ) are more closely related to each other and share more characteristics, than species in a different genus (e.g. Macropodia). Inachus have a short rostrum, spines behind the eyes and a broad triangular-shaped body Macropodia have a long, thin rostrum that comes to a single point, do not have spines behind the eyes and the body shape is triangular, but more pointed. Why are these two species of spider crabs a different genus?