SEROLOGICAL COMPARISONS OF ASTACURAN CRUSTACEA

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Abstract
Serological comparisons of the serum proteins (the hemocyanins) of astacuran Crustacea were detd., using the precipitin test and a photoelectric turbidimeter. Hemocyanins of 5 spp. of crayfishes belonging to the family Astacidae (Orconectes neglectus. O. nais. O. immunis. O. virilis and Procambarus simulans). of 5 spp. of freshwater Australian crayfishes belonging to the family Parastacidae (Cherax albidus. Cherax destructor. Euastacus elongatus. E. nobilis and E. armatus). and of one sp. of Homaridae (Homarus americanus) were compared using 20-min. and 24-hr. reaction times. The families Astacidae, Parastacidae and Homaridae are serologically distinct from one another. The spp. within the genus Orconectes are closely related. Serological data show that O. immunis and O. nais are most clesely related to each other, and that O. neglectus and O virilis are more closely related to O. nais than to O. immunis. Procambarus simulans is closely related to spp. in the genus Orconectes. Within the family Parastacidae the genera Cherax and Euastacus are notably different serologically, but are more closely related to one another than to spp. from the Astacidae or Homaridae. E. armatus and E. nobilis are more closely related to each other than either is to E. elongatus. Homarus americanus, in the family Homaridae, is distantly related to species belonging to the families Astacidae and Parastacidae.

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