. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. REPRODUCTIVE CYCLE OF PSOLL'S FABRICll 129. Figure 3. Psolus lahncn Light micrographs of sections of gonads of juveniles. (A) Immature gonad (from an individual weighing < g in dry body wall mass) showing the germinal epithelium (GE) and an absence of identifiable precursor cells for two germinal tubules (GT); (B) Immature female (between 10 g) with oogonia (O). primary oocytes (PR), but an absence of more advanced stages; (C) Immature male (between g) showing the proliferation zone (PZ) and the lumen conta
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. REPRODUCTIVE CYCLE OF PSOLL'S FABRICll 129. Figure 3. Psolus lahncn Light micrographs of sections of gonads of juveniles. (A) Immature gonad (from an individual weighing < g in dry body wall mass) showing the germinal epithelium (GE) and an absence of identifiable precursor cells for two germinal tubules (GT); (B) Immature female (between 10 g) with oogonia (O). primary oocytes (PR), but an absence of more advanced stages; (C) Immature male (between g) showing the proliferation zone (PZ) and the lumen containing only a few spermatozoa (SP); (D) Young female ( = 10 g) showing the germinal epithelium (GE), primary oocytes (PO) and a few vitellogenic oocytes (V); (E) Young male ( = 10 g) showing two distinct germinal tubules (GT) and numerous spermatozoa (SP) in the lumen. The horizontal bar in photograph A represents 800 ^m and applies to all of the photographs. (equivalent to = cm in distance mouth-anus). The relative size of the gonads increased sharply as the dry body wall mass rose from 3 to 10 g (Fig. 2C). The size of testis and ovary overlapped greatly up to a body wall mass of = 15 g, but the testis was generally larger than the ovary for larger individuals (Kruskal-Wallis, analysis of variance, P < , followed by a non-parametric multiple-range test, P < ; Sokal and Rolph, 1981). The variation in gonadal size was relatively small between 20 and 34 g ( to cm); beyond that range the relative gonadal size dropped. Histological preparations showed that only undiffer- entiated precursor cells are present along the germinal epithelium of individuals weighing < g( = cm) (Fig. 3A). The sex of larger individuals could be identified by the presence of oogonia and young oocytes in females, and spermatogonic stages in males (Fig. 3B, C). Beginning at g ( cm), the sexes were readily recognized. Please note that these images are extracted f
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
