. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PARASITIC CASTRATION OF CALLINECTES 281 ture. In the female each abdominal somite has a pair of dorsal muscles, but in the male the fused section has only two pairs of dorsal muscles. Dissection of the parasitized males, to discover whether or not total segmenta- tion of the abdomen affects the dorsal musculature, revealed that each abdominal segment was equipped with a pair of dorsal muscles exactly as in the female (Fig. 3). Evidently a new pair of muscles arises in the previously fused region so that the three segments in
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PARASITIC CASTRATION OF CALLINECTES 281 ture. In the female each abdominal somite has a pair of dorsal muscles, but in the male the fused section has only two pairs of dorsal muscles. Dissection of the parasitized males, to discover whether or not total segmenta- tion of the abdomen affects the dorsal musculature, revealed that each abdominal segment was equipped with a pair of dorsal muscles exactly as in the female (Fig. 3). Evidently a new pair of muscles arises in the previously fused region so that the three segments into which it becomes divided are each furnished with a separate pair of dorsal muscles. We are of the opinion that it is the muscles of the third somite which arise dc novo, because the area which becomes the third somite is originally without trace of dorsal muscles, while the two pairs of existing muscles lie in the center and at the posterior region respectively of the fused section. Turning now to the appendages of the male abdomen we find further evidence of feminization in the case of the second pleopod. This appendage is constructed on. 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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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
