. Breviora. MALE. FEMALE Figure 3. Trimnia laylori. sexual dimorphism of genital papillae. Drawn from MCZ 51686. Paratypes by Karsten Hartel. Color in alcohol. All colors vanish, body pale. Pigment spots on dorsum of head visible after one year but fade thereafter. Fins transparent. Sexual dimorphism. Morphometric differences are not immedi- ately apparent between the sexes; however, males and females may be distinguished on the basis of genital papillae (Fig. 3). The papilla of the male is slender, curved and tapers to a point posteriorly. The female's papilla is greater in diameter than that
. Breviora. MALE. FEMALE Figure 3. Trimnia laylori. sexual dimorphism of genital papillae. Drawn from MCZ 51686. Paratypes by Karsten Hartel. Color in alcohol. All colors vanish, body pale. Pigment spots on dorsum of head visible after one year but fade thereafter. Fins transparent. Sexual dimorphism. Morphometric differences are not immedi- ately apparent between the sexes; however, males and females may be distinguished on the basis of genital papillae (Fig. 3). The papilla of the male is slender, curved and tapers to a point posteriorly. The female's papilla is greater in diameter than that of the male and uniform in thickness, terminating in a round opening with a bilobed flap bilaterally; it is also directed posteriorly but it is not as long as that of the male. Immature gobies exhibit no sexual difference in the shape of the papilla (see also Egami 1960). There are significant differences in both shape and size of male and female genitalia among Trimma T. taylori and T. caesiura. The genitalia of T. taylori and T. caesiura are very similar in shape and structure but differ in relative length of the papilla of the 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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