. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SEX-CHARACTERS IN LEBISTKS RETICULATUS. 379 25 mm. The dorsal fin is rounded as is the case in normal females Near the anal orifice a dark black spot can be seen which charac- terizes the mature female in the viviparous fishes and which has been called "puberty spot" by Essenberg (3). The anal fin however has been modified towards the male direction and resembles a gonopod of not fully developed males, (Fig. 12). The colorations are more like those of the male than those of a female. The black spot found in the tai
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SEX-CHARACTERS IN LEBISTKS RETICULATUS. 379 25 mm. The dorsal fin is rounded as is the case in normal females Near the anal orifice a dark black spot can be seen which charac- terizes the mature female in the viviparous fishes and which has been called "puberty spot" by Essenberg (3). The anal fin however has been modified towards the male direction and resembles a gonopod of not fully developed males, (Fig. 12). The colorations are more like those of the male than those of a female. The black spot found in the tail region is present in the hermaphrodite as well as the orange line on the lower margin of the tail fin. Compare Fig. 10, which is a normal female, Fig. n,. FIG. 13, a normal male, and Fig. 12, the hermaphrodite. On dissection a fully developed ovary containing almost completely formed embryos was discovered. The gonad was embedded and sections, 8 microns in thickness, made. Material was stained in Heidenhain's iron-hematoxylin and Mallory's connective tissue stain. The histological picture corroborates all the features that were observed by the unaided eye, that is, a well-developed ovary with embryos almost ready to be born. Besides all along the ovary, gradually tapering, was found a well developed testicle (Fig. 13).. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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