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Female Shasta crayfish with second instar young attached to the underside of her abdomen
Juvenile Shasta crayfish
A Juvenile Shasta crayfish exhibiting partial blue colouration
Blue colour morph Shasta crayfish with the orange colour still visible in the sutures of the carapace and chelae
Shasta crayfish
Adult Shasta crayfish in “defence” posture, with the serrated rostrum (the protuberance between the eyes) visible, a diagnostic feature of the species
Shasta crayfish of typical colouration camouflaged against substrate
Adult Shasta crayfish, showing wide light-coloured patch between the carapace and the abdomen (tail) indicating an approaching moult
Shasta crayfish
A darker colour morph Shasta crayfish hiding in rocks
Shasta crayfish with regenerated right chela (pincer)
Shasta crayfish with two branchiobdellidan worms (probably Magmatodrilus obscurus) attached; one of two species of commensal worms found only on Shasta crayfish
Mouth parts of Shasta crayfish adapted for scraping material off the surface of the rocky substrate typical of their habitat
