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