Morphometric differentiation in chromosomally characterized parapatric races of morabine grasshoppers (Orthoptera : Eumastacidae)

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Abstract
Morphometric analyses were carried out on five chromosomal races from the viatica group of morabine grasshoppers (Eumastacidae : Morabinae). The extent of intra- and interracial divergence was assessed and the population phenetics of a natural zone of hybridization between the 17 and 19- chromosome races of viatica was examined. Considerable evidence of intertaxon differentiation was noted. Conflicting evidence for introgression was found in the vicinity of the hybrid zone.