Spermatophores of the salamander Ambystoma texanum

Russell, Lonnie D.; Brandon, Ronald A.; Zalisko, Edward J.; Martan, Jan

doi:10.1016/0040-8166(81)90031-8

Cited by 33 publications

(19 citation statements)

References 13 publications

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“…Among urodele spermatophores, three diVerent microstructures are known: (1) in Ambistomatidae the central area of the cap is surrounded by a membranelike structure, distorted near the top of the stalk; sperm are concentrated in groups at the cap surface with heads directed outwards and tail inward (Russel et al 1981); (2) in Notophthalmus viridescens, L. vulgaris and Cynops pyrrhogaster the membranelike showing the connecting piece in the nuclear fossa, proximal centriole, annulus and anterior Xagellum. b Transverse section of the nuclear fossa.…”

Section: Spermatophorementioning

confidence: 99%

Male reproductive system in the Italian newt Lissotriton italicus (Peracca 1898) (Amphibia, Urodela): ultrastructural and morphological study with description of spermiogenesis, spermatozoon and spermatophore

et al. 2009

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The Wrst morphological and ultrastructural description of testis, WolYan duct, spermatophore, and spermatozoon of Lissotriton italicus is provided. The male reproductive system of this species consists of a pair of monolobed testes, fat bodies, eVerent ductules, paired WolYan duct, and the cloaca. The WolYan duct is pseudostratiWed, consisting of an epithelium composed of an alternation of ciliated cells and non-ciliated secretory cells, with scattered basal cells. Melanocytes are found in the basal lamina of the WolYan duct. Spermiogenesis is of the discontinuous type. In the early spermatid nuclear elongation, Xagellar extrusion and development of a large acrosomal vesicle occur. Soon the perforatorium develops and the Xagellum elongates. In the late spermatid gradual chromatin condensation and nuclear elongation is noticeable. At the end of spermiogenesis the Xagellum develops marginal Wlament and undulating membrane. The mature sperm of L. italicus consists of a distinct head (acrosome, perforatorium, nucleus and nuclear ridge, plus the apical acrosomal barb) and a tail with axoneme, undulating membrane, and axial Wber. Nuclear ridge and apical acrosomal barb are two autapomorphic characters found in the Urodela. Several apomorphic characters for Salamandroidea are also present: elongation of the connecting piece, an apically modiWed acrosome vesicle, trifoliate axial Wber within the principal piece, elongate annulus, elongate midpiece, and the gentle merging of the axial Wber/principal piece into the endpiece. The spermatophore of L. italicus is formed by a cap consisting of randomly distributed spermatozoa surmounting a short pedicel. A membranelike structure involving the spermatophore is absent.

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Section: Spermatophorementioning

confidence: 99%

Male reproductive system in the Italian newt Lissotriton italicus (Peracca 1898) (Amphibia, Urodela): ultrastructural and morphological study with description of spermiogenesis, spermatozoon and spermatophore

et al. 2009

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“…3 The structure and histochemistry of spermatophores of several species of the families Ambystomatidae, Salamandridae, and Plethodontidae are described. 66,67 In Necturus, the spermatophores are deposited by a male to a female directly by cloacal apposition and the stalk may be absent in these species. 3 …”

Section: Spermatophoresmentioning

confidence: 99%

Testicular structure and germ cells morphology in salamanders

Uribe

Mejía-Roa

2014

Spermatogenesis

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“…In E. longicauda , there is only one cell type found in genital kidney proximal tubules, and those epithelial cells possess both a microvillus brush border and cilia. Siegel et al () and Nicholson and Siegel () interpreted ciliary action of the epithelium of genital kidney proximal tubules as a mechanism to mix seminal fluids, following the suggestion of Hess () in amniotes, although others have proposed sperm propulsion through sperm transport ducts (Matsuda, ; McLaughlin & Humphries Jr, ; Russell, Brandon, Zalisko, & Martan, ). Either way, the presence of cilia in proximal tubules of genital kidney nephrons is morphologically equivalent to ciliated epithelia of ductuli efferentes of amniotes (for review, see Sever, ).…”

Section: Discussionmentioning

confidence: 99%

Modification of genital kidney nephrons for sperm transport in a plethodontid salamander, Eurycea longicauda

Hartley

Gribbins

Siegel

2019

Journal of Morphology

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Salamanders possess kidneys with two distinct regions: a caudal pelvic portion and cranial genital portion. Nephrons of the pelvic region are responsible for urine formation and transport. Nephrons of the genital region transport sperm from testes to Wolffian ducts; however, nephrons of the genital region possess all the same functional regions found in pelvic kidney nephrons that are involved with urine formation and transport (renal corpuscles, proximal tubules, distal tubules, and collecting ducts). Morphological similarities between pelvic and genital regions stimulated past researchers to hypothesize that nephrons of genital kidneys possess dual function; that is, sperm transport and urine formation/transport. Considering size of glomeruli is directly related to the total amount of blood plasma filtered into the Bowman's space, we tested the hypothesis that nephrons of genital kidneys have reduced urine formation function by comparing glomerular size between nephrons of pelvic and genital kidney regions in Eurycea longicauda with general histological techniques. Light microscopy analysis revealed that glomeruli of pelvic kidneys were significantly larger than those measured from genital kidneys. Transmission electron microscopy analysis also revealed modifications in genital kidney nephrons when compared to pelvic kidney nephrons that suggested a decrease in urine formation function in genital kidneys. Such modifications included a decrease in basal and lateral plasma membrane folding in genital kidney proximal and distal tubules compared to that of pelvic kidney proximal and distal tubules. Genital kidney proximal tubules were also ciliated, which was not observed in pelvic kidney proximal tubules. In conclusion, although structurally similar at the histological level, it appears that nephrons of genital kidneys have decreased urine formation function based on glomerular size comparison and nephron ultrastructure.

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Spermatophores of the salamander Ambystoma texanum

Cited by 33 publications

References 13 publications

Male reproductive system in the Italian newt Lissotriton italicus (Peracca 1898) (Amphibia, Urodela): ultrastructural and morphological study with description of spermiogenesis, spermatozoon and spermatophore

Male reproductive system in the Italian newt Lissotriton italicus (Peracca 1898) (Amphibia, Urodela): ultrastructural and morphological study with description of spermiogenesis, spermatozoon and spermatophore

Testicular structure and germ cells morphology in salamanders

Modification of genital kidney nephrons for sperm transport in a plethodontid salamander, Eurycea longicauda

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