Male Reproductive Cycle of a Neotropical Snake,<i>Lygophis anomalus</i>(Dipsadidae), in a Temperate Geographic Distribution

Sivan, Jaim; Panzera, Alejandra; Maneyro, Raúl

doi:10.2994/sajh-d-15-00021.1

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…Snakes of the Tribe Xenodontini and some other dipsadids in South America frequently have continuous or broad female reproductive cycles, even when living in areas with seasonal climates (Pizzatto et al 2008). Males apparently remain reproductive throughout the year in most species of Xenodontini (Pizzatto et al 2008, Sivan et al 2016 as observed for E. miliaris in the present study.…”

Section: Discussionsupporting

confidence: 73%

Reproductive aspects of the semi-aquatic snake Erythrolamprus miliaris (Dipsadidae: Xenodontini) in the state of Rio de Janeiro, southeastern Brazil

Eisfeld

Vrcibradic

2019

An. Acad. Bras. Ciênc.

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Section: Discussionsupporting

confidence: 73%

Reproductive aspects of the semi-aquatic snake Erythrolamprus miliaris (Dipsadidae: Xenodontini) in the state of Rio de Janeiro, southeastern Brazil

Eisfeld

Vrcibradic

2019

An. Acad. Bras. Ciênc.

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“…Loebens et al (2020) also recorded that the highest values of testicular volume in January (summer) in T. dorsatus from the south region of Brazil. The dipsadid Lygophis anomalus also showed a peak in testis volume in the summer season (Sivan et al 2016). This absence of seasonal and no significant variation in the testicular volume may be indicative of a continuous reproductive cycle in these males (Loebens et al 2020).…”

Section: Discussionmentioning

confidence: 91%

Seasonal variations of male reproductive parameters of Tomodon dorsatus from Southeastern Brazil

Abud

Schimming

2021

Pesq. Vet. Bras.

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The morphology of the male reproductive tract of Tomodon dorsatus was described in the austral seasons of the year considering macroscopic and microscopic variables. For this purpose, 56 specimens from the herpetological collection of the “Instituto Butantan” were used. Fragments of the testes, kidneys and ductus deferens were collected and submitted to histological routine. The peak of the testicular volume was observed in the summer and the epithelium of the seminiferous tubules had higher height in the summer (p=0.001). The testes were active throughout the year, however, the spermiogenesis peaked in the summer. There were spermatozoa in the lumen of the ductus deferens in all seasons of the year. Renal length was higher in autumn (p=0.027), and renal width did not show a significant increase (p=0.237). The diameter and epithelial height of the sexual segment of the kidney (SSK) showed hypertrophy in winter and spring, coinciding with the mating period. Based on findings of this study, we can suggest that, at the population level, the reproductive cycle of T. dorsatus can be considered seasonal semi-synchronous, due to the peak of spermiogenic activity in the hot season, and discontinuous at the individual level.

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“…There are few and scattered data on diet (Carreira-Vidal, 2002), litter size (Amaral, 1977;Achaval & Olmos, 2003), morphometrics and folidosis (Michaud & Dixon, 1987;Giraudo, 2001), based on analysis of few specimens. Previous data on reproductive traits of L. flavifrenatus are limited to observation on clutch size (Amaral, 1977;Achaval & Olmos, 2003), and Lygophis anomalus (Günther, 1858) is the only Lygophis species further investigated for reproduction (Panzera & Maneyro, 2013;Sivan et al, 2016). Lygophis anomalus females presented seasonal reproductive cycle, clutch size averaging 7.37 eggs, possibly lay multiple clutches during one reproductive season, and reach sexual maturity with a larger size than males (Panzera & Maneyro, 2013).…”

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confidence: 99%

Aspects of reproduction and sexual dimorphism of Lygophis flavifrenatus (Dipsadidae: Xenodontinae)

Quintela

Loebmann

2019

Iheringia, Sér. Zool.

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Lygophis flavifrenatus Cope, 1862 is a terrestrial dispsadid distributed in subtropical Brazil, Paraguay, Uruguay, and Argentina. Herein, we present data on sexual dimorphism and reproductive biology of this very poorly studied species. A total of 108 specimens (55 females, 50 males, three hatchlings with unidentified sex) from Brazilian states of Rio Grande do Sul, Santa Catarina and Mato Grosso do Sul were analyzed. Sexual dimorphism by size, body dimensions (tail length, head length, head width) and a number of ventral and subcaudal scales is not well marked in the species. Mature females attain the greater size and have a higher number of ventral scales than mature males. Mature males, in turn, presented longer tail, longer and wider head and a higher number of subcaudal scales. Meanwhile, marked overlaps were observed in ranges of all body dimensions proportions and a number of ventral and subcaudal scales. Females attained sexual maturity at a greater size than males. The smallest mature female showed snout-vent length (SVL) = 402 mm while the smallest mature male presented SVL = 285 mm. Females presented a seasonal reproductive cycle, with advanced stages (advanced development of secondary follicles and development of eggs) occurring in late winter and spring. Hatchlings were found in late summer. It is supposed that only one clutch is laid per cycle, considering that the great majority of secondary follicles found in females carrying eggs were irregular or lamellar shaped (possibly atresic). Clutch sizes varied from 6 to 12 eggs (mean = 8.2) and presented a tendency for positive correlation with progenitors SVL. The present study adds new information to the knowledge about the natural history of snakes from subtropical Neotropics.

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Male Reproductive Cycle of a Neotropical Snake,Lygophis anomalus(Dipsadidae), in a Temperate Geographic Distribution

Cited by 4 publications

References 11 publications

Reproductive aspects of the semi-aquatic snake Erythrolamprus miliaris (Dipsadidae: Xenodontini) in the state of Rio de Janeiro, southeastern Brazil

Reproductive aspects of the semi-aquatic snake Erythrolamprus miliaris (Dipsadidae: Xenodontini) in the state of Rio de Janeiro, southeastern Brazil

Seasonal variations of male reproductive parameters of Tomodon dorsatus from Southeastern Brazil

Aspects of reproduction and sexual dimorphism of Lygophis flavifrenatus (Dipsadidae: Xenodontinae)

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