AbstractEighty Gumaga nigricula larvae from Hopland Spring and Big Sulphur Creek, northern California, USA, were studied to quantify possible dissimilarities among them. The populations are statistically different in two meristic characters: number of setae on the anterior margin of the pronotum and number of pleural sclerites on abdominal segment VIII. They also appear to be different in a continuous character, head width/length ratio. In all cases, specimens from Big Sulphur Creek have statistically significant higher values. These data are congruent with the hypothesis that there is biologically significant genetic isolation between these populations.
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