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This study describes the microscopic anatomy of the reproductive systems of the …


Biology Articles » Anatomy & Physiology » Anatomy, Animal » Microscopic Anatomy of the Reproductive System in Two Sympatric Species of Fissurella Bruguiére, 1789 (Mollusca: Vetigastropoda) » Figures

Figures
- Microscopic Anatomy of the Reproductive System in Two Sympatric Species of Fissurella Bruguiére, 1789 (Mollusca: Vetigastropoda)

 

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Figure 1   Fissurella latimarginata and Fissurella cumingi. Common schematic organization of the reproductive system. A. Transverse view. B. Dorsal view. Proportions of structures were not necessarily drawn to scale. Abbreviations: a, anus; c, genital duct (renopericardial duct); ct, ctenidium; g, gland; go, gonad; la, left auricle; Ik, left kidney; lko, left kidney opening; n, nephrostome; p, pericardium; ra, right auricle; rk, right kidney; rko, right kidney opening; v, ventricle.

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Figure 2   A-K. Fissurella latimarginata. Photomicrographs of the histological sections of the reproductive system. A. Male gonad showing the centrifugal organization of the gonadal septae. B. Female gonad in vitellogenesis with organization similar to (A). C. Transverse section, showing connection between the male gonad, the gland, and the genital duct. D. Sagittal section of a male showing the nephrostome connecting the genital duct with the pericardial cavity. E. Longitudinal section of a male showing the distal portion of the genital duct opening into the distal region of the right kidney. Note the dendriform epithelial folds which project into the lumen of the duct. F. Sagittal section of a male showing the right kidney opening. Note mass of spermatozoa liberated into mantle cavity G. Sagittal section of a male showing the genital duct directed from the gonad toward the roof of the visceral cavity. Note the gland attached to the internal wall of the duct and a parasite partially obstructing its exit. H. Longitudinal section of a female showing the point of connection between the gonad, the gland, and the genital duct. Note the oocytes at the extreme lower right of the duct. I. Sagittal section in a female showing the nephrostome connecting the genital duct with the pericardial cavity. J. Longitudinal section in a female showing the distal portion of the duct emptying into distal region of the right kidney. Note the dendriform epithelial folds projecting into the lumen of the duct. K. Sagittal section in a female showing the right kidney opening connecting with mantle cavity Abbreviations: c, genital duct; ct, ctenidia in the mantle cavity; e, gonadal epithelium; g, gland; gl, gonadic lumen; go, gonad; h, hemolymph in the hemofymphatic sinus; 1, lip of the renal aperture; mu, muscular roof of the visceral cavity; m, mantle cavity; n, nephrostome; p, pericardium, pa: parasite; ra, right auricle; rk, right kidney; rko, right kidney opening; s, blood sinus; sp, spermatozoa in the mantle cavity; v, visceral cavity; thick arrow, spermatozoa in the gonad organized in sheafs; arrow, oocytes in vitellogenesis; arrowhead, gonadal septae. Scale bar: A, B= 100 µm; C, D, F, G, H, I, K= 500 µm; E, J= 250 µm.

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Figure 3   A-D. Fissurella cumingi. Photomicrographs of the constituents of the reproductive system seen in a transversal section. A. Section showing the connecting point between the male gonad, the gland, and the genital duct. B. Section of a male showing the right kidney opening connecting with the mantle cavity. C. Section showing the connecting point between the female gonad, the gland, and the genital duct. D. Section of a female showing the right kidney opening connecting with the mantle cavity. Note an oocyte into the kidney (arrow). E-H. F. latimarginata and F. cumingi. Transverse section of the epithelium of the genital duct (reconstruction). E, G. Transverse section of the upper (E) and lower (G) epithelium of the duct in a male F. latimarginata. F, H. Transverse section of the upper (F) and lower (H) epithelium of the duct in a male F. cumingi. Note the apocrine secretory nature of the duct. Abbreviations: c, genital duct; g, gland; go, gonad; h, hemolymph in the hemolymphatic sinus; 1, lip of the right renal aperture; m: mantle cavity; mu, muscular roof of the visceral cavity; n: nephrostome, p, pericardium; rk, right kidney; rko, right kidney opening; v: visceral cavity; upper epithelium (thick arrow), lower epithelium (arrowhead), spermatozoa in the lumen of the duct (arrow). Scale bar: A-D= 500 µm; E-H= 25 µm.

 


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