. Breviora. 8 BREVIORA No. 408 3A y IJ. 30 40 50 GO Overall length [min] Figure 2. Regression of the fixed finger length onto overall length for males (squares) versus females (circles) of Upogebia affinis. The upper triangle is the x-axis median for males; through it passes the best-fit median, regression line. The envelope of lighter lines are 90% confidence limits. The lower triangle marks the female x-axis median point with a similar set of lines. sympatric species interesting, but to little purpose until their natural history is better known. The analysis does point to prob- lems latent i
. Breviora. 8 BREVIORA No. 408 3A y IJ. 30 40 50 GO Overall length [min] Figure 2. Regression of the fixed finger length onto overall length for males (squares) versus females (circles) of Upogebia affinis. The upper triangle is the x-axis median for males; through it passes the best-fit median, regression line. The envelope of lighter lines are 90% confidence limits. The lower triangle marks the female x-axis median point with a similar set of lines. sympatric species interesting, but to little purpose until their natural history is better known. The analysis does point to prob- lems latent in the use of measured characters in this genus. One must quantify the variability and examine it comparatively be- fore any but the most ob\'ious differences in proportion are given taxonomic weight. The regression analysis confirmed one feature of taxonomic in- terest. Upobegia affinis has conspicuous sexually dimorphic chelipeds. In the males the cheliped is consistently more robust, larger, and better calcified than in the female. In U. omissa, while the males tended to be more variable about the regression line reflecting the occasional dimorphic indixidual as reported by Correa (1968), there was no significant difference between. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. , Museum of Comparative Zoology, Harvard University
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