#astaco

• Astaco- — A scientific combining form (prefixoid) extracted from the Greek language (from 'astakos'), used in rare scientific, zoological, and paleontological terminology to refer to crayfish, decapod crustaceans of the Astacidae family, or to describe anatomical and fossil structures belonging to or closely related to this group of aquatic organisms.
• Astacoid — Resembling a crayfish or the species of the Astacus genus in form, structure, or general appearance; a morphological adjective used to describe fossil specimens, crustacean larvae, or external anatomical characters (such as the carapace or claws) reminiscent of the river crayfish's structural configuration.
• Fossilized crayfish — The fossilized remnant, petrified imprint, or petrographic cast of a prehistoric crayfish or a part of the exoskeleton of a decapod crustacean from the Astacidae family; these structural fossil formations are used in stratigraphical geology as biofacial indicators for reconstructing ancient freshwater aquatic environments.
• Astacomorph — Having the shape, external structure, or morphological appearance resembling a crayfish (of the genus Astacus); (as a plural neuter noun, Astacomorpha) an infraorder of decapod crustaceans that includes freshwater crayfish and lobsters, structurally characterized by large chelae on the first pair of legs and a well-developed abdomen.