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image of Journal of Crustacean Biology

ABSTRACT Heterospecific implantations of androgenic glands (AG) showed that the male hormone of terrestrial isopods had a relatively high-action specificity. Within a zoological genus the hormone of one species was effective in the other species of the same genus. This was not always the rule between species from different genera of the same family or between species belonging to different families. The male hormone was ineffective in species belonging to different suprafamilies (Oniscoidea and Porcellionoidea) and suborders (Tylomorpha and Ligiamorpha). These new results allowed the relationships between different genera of a given family and between different families and suprafamilies to be identified. The neurohormone controlling AG growth was always speciesspecific.


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