Electron Microscope Study of Lizard Spermiogenese in<i>Tropidurus Torquatos</i>(Lacertilia)

Cruz-Landim, Carminda da; Cruz‐Höfling, Maria Alice da

doi:10.1080/00087114.1977.10796688

Cited by 28 publications

(36 citation statements)

References 9 publications

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“…It is possible that the differences reported above between T. semitaeniatus and T. torquatus and the species studied by those authors reflect taxonomic differences, i.e. the Tropidurus studied by Cruz-Landim & Cruz-Höfling (1977) and Cruz-Höfling & Cruz-Landim (1978) was not T. torquatus, but a related species within the same species group. A phylogenetic analysis of Tropidurus based on osteology, squamation, color, and hemipenes suggests that T. semitaeniatus is a closer relative of T. torquatus than other members of the T. torquatus group (Frost, 1992).…”

Section: Discussionmentioning

confidence: 89%

“…In 1987, the T. torquatus species complex was split into 11 taxa (Rodrigues, 1987) and, without precise locality data and/or the re-examination of specimens, it is impossible to determine the current taxonomic status of the material studied by Cruz-Landim & Cruz-Höfling (1977) and Cruz-Höfling & Cruz-Landim (1978). It is possible that the differences reported above between T. semitaeniatus and T. torquatus and the species studied by those authors reflect taxonomic differences, i.e.…”

Section: Discussionmentioning

confidence: 99%

“…Studies on the ultrastructure of spermatozoa have fostered knowledge on the development and functional significance of many spermatozoal organelles (Stanley, 1971), elucidating the relationship among these components and reproduction itself (Cruz-Landim & Cruz-Höfling, 1977). Detailed accounts on the ultrastructure of spermatozoa also supply an independent source of characters for phylogenetic analyses, which are especially useful when other character sets are not enlightening (Jamieson, 1995a;1995b;Teixeira et al, 1999a).…”

Section: Introductionmentioning

confidence: 99%

“…Among Tropiduridae, the mature spermatozoon of Liolaemus austromendocinus and Phymaturus flagellifer (=palluma) have been described (Furieri, 1974), and an account on the spermiogenesis of Tropidurus cf. torquatus is available (Cruz-Landim & Cruz-Höfling, 1977;Cruz-Höfling & Cruz-Landim, 1978). …”

Section: Introductionmentioning

confidence: 99%

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Ultrastructural study of spermatozoa of the neotropical lizards, Tropidurus semitaeniatus and Tropidurus torquatus (Squamata, Tropiduridae)

Teixeira

Vieira²,

Colli³

et al. 1999

Tissue and Cell

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A detailed description of the sperm ultrastructure of Tropidurus semitaeniatus and T. torquatus is provided. Mature spermatozoa of T. semitaeniatus and T. torquatus are filiform and characterized by: apical portion of acrosome depressed; perforatorium single; epinuclear lucent zone well developed; midpiece short; mitochondria columnar; midpiece with three sets of alternating ring structures and mitochondria (rs1/m1, rs2/m2, rs3/m3); nuclear shoulders rounded; nucleus elongate; fibres 3 and 8 enlarged; and fibrous sheath in midpiece. Spermatozoa ofTropidurus are unusual in possessing a unilateral electron-lucent ridge at the surface of the acrosome and an epinuclear electron-lucent zone. The two species are very similar, differing in details such as degree of acrosome flattening, presence of bulging at nuclear base, and arrangement of microtubules in the endpiece. Comparisons between Tropiduridae and other families of iguanian lizards are made.

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Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ultrastructural study of spermatozoa of the neotropical lizards, Tropidurus semitaeniatus and Tropidurus torquatus (Squamata, Tropiduridae)

Teixeira

Vieira²,

Colli³

et al. 1999

Tissue and Cell

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show abstract

“…Data were observed as regard the histology of the reproductive aspects for the family Tropiduridae ie, Tropidurus albermalensis (Stebbins et al, 1967) and Liolaemus austromendocinus and Prymaturus flagellifer (Furieri, 1974), T. hispidus (Prieto et al, 1976), T. delanonis (Werner, 1978), T. quadrivittatus and T. theresioides (Goldberg & Rodriguez, 1986), T. torquatus (Cruz-Landim & Cruz-Höfling, 1977;Cruz-Höfling & Cruz-Landim 1978;Vieira et al, 2001) and T. itambere (Van Sluys, 1993;Ferreira & Dolder, 2003a, 2003bFerreira et al, 2006;Ferreira & Dolder, 2007) and the family Iguanidae (ie. Saita et al 1988;, details of gametogenesis until fertilization of lizards under different climatic and seasonal conditions are scarcely known.…”

Section: Introductionmentioning

confidence: 99%

Reproductive Strategies of Brazilian Lizards of the Genus Tropidurus Rodrigues, 1987 (Squamata, Tropiduridae) in the Temporal and Spatial

2011

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Estrategias Reproductivas de las Lagartijas Brasileñas del Género SUMMARY:Reproductive strategy is the set of adaptations that promote the most efficient way that the species will survive under the particular conditions of a determined environment. Understanding these adaptations is important and can help pinpoint populations indicator of environmental changes. Spermatogenesis is a measurable biological process of these adaptations in spatial and temporal scales. We analyzed the morphology of the testes and oviducts of the lizard species that comprise the genus Tropidurus, taking into account the geographical distribution and sympatric relations. For the analysis and the testes were removed from the middle part of the oviducts from Tropidurus etheridge, T. oreadicus, T. itambere, T. spinulosus and T. Guarani species, collected in different places in the Mato Grosso state, Brazil. The reproductive period is synchronous for males and females and occurs in September, October and November. Reproductive males were characterized. In the testes are seminiferous tubules with germ cells at different stages of spermatogenesis, with a high epithelium, at present light, free spermatozoa in the lumen and reduction of interstitial tissue. For females, the reproduction peak occurs when the oviduct epithelium is high with secretions and basal nucleus. These months are characterized in the sampled areas over a period of heavy rain and high temperatures. The decline of reproductive period was observed in both sexes, between April and August. Low reproduction in males is characterized by ample light, absence of sperm, only germ cells in the early stages of spermatogenesis are observed (a few spermatogonia and spermatocytes) and interstitial tissue wide. In females, the period of reproductive decline is marked by the absence of unicellular glands in the oviduct epithelium, with higher affinity with the dye. This period corresponds to low rainfall periods and lower temperatures. We propose an analysis of zoological samples; this is a proposal to facilitate the work of many researchers through access to the species, especially rare species.

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Ultrastructure of the turtle spermatozoon

1991

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The turtle spermatozoon is vermiform in shape with a narrow pointed head that is curved. In general, the turtle sperm contains a typical head, midpiece and tail, similar in morphology to that of birds, amphibians and other reptiles. However, several structures are unique. These unusual features include (1) a perforatorial cap over the proximal end of the nucleus, which contains 2-3 rods that are contiguous with intranuclear tubules; (2) a connecting collar of dense material that surrounds the base of the nucleus; (3) a distal centriole containing central microtubules that extend its entire length and having outer triplicate microtubules that open toward the central cavity of the centriole; and (4) unusual spherical mitochondria containing 7-8 outer laminated membranes.

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Electron Microscope Study of Lizard Spermiogenese inTropidurus Torquatos(Lacertilia)

Cited by 28 publications

References 9 publications

Ultrastructural study of spermatozoa of the neotropical lizards, Tropidurus semitaeniatus and Tropidurus torquatus (Squamata, Tropiduridae)

Ultrastructural study of spermatozoa of the neotropical lizards, Tropidurus semitaeniatus and Tropidurus torquatus (Squamata, Tropiduridae)

Reproductive Strategies of Brazilian Lizards of the Genus Tropidurus Rodrigues, 1987 (Squamata, Tropiduridae) in the Temporal and Spatial

Ultrastructure of the turtle spermatozoon

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