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Biol Bull 117: 154-162. (August 1959)
© 1959 Marine Biological Laboratory
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A REVISION IN THE SPHAEROMID GENUS GNORIMOSPHAEROMA MENZIES (CRUSTACEA: ISOPODA) ON THE BASIS OF MORPHOLOGICAL, PHYSIOLOGICAL AND ECOLOGICAL STUDIES ON TWO OF ITS "SUBSPECIES"

J. A. RIEGEL 1

1 Department of Zoology, University of California, Davis. California

1. In the writer's opinion, Menzies' determination that Gnorimosphaeroma oregonensis consists of two subspecies is not valid, since there is no apparent morphological and ecological intergradation between the two, and their distribution is discontinuous.

2. There is no evidence that the two forms are ecotypes. The morphological differences between them are not correlated with any known factor in their environment, and Gnorimosphaeroma oregonensis lutea hatched and reared for three months in habitat conditions close to those of G. o. oregonensis retained their typical morphological configuration.

3. It is the opinion of the writer that until such time as extensive rearing and breeding tests can be performed, it is best to propose the elevation of the two subspecies to full species status.






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