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(1) Zoological evidence, admittedly meager in amount, concerning the correlation of parthenogenesis with the emergence and propagation of new forms, is presented from the work of Harrison on hybridization of the moths Tephrosia bistortata and T. crepuscularia and Artom on tetraploidy in the brine shrimp Artemia salina. (2) Harrison's results which show that crossing between the two species has resulted in the production of F1 hybrids intermediate in character and parthenogenetic in sex which, in turn, have produced a small F2 generation of new types of both sexes by character segregation, are regarded as illustrating that among animals it is possible that hybridity and correlated parthenogenesis may be responsible for the emergence of new forms. (3) Artom's results are interpreted as illustrating that parthenogenesis has been closely correlated with the emergence, and has been responsible for the maintenance of the more recently derived tetraploid and genotypically different Capodistria race of Artemia salina.
The American Naturalist © 1925 The University of Chicago Press