Standard karyotypes of two species of the genus Scincella, S. assata and S. cherriei, both from Chiapas State, Mexico, were described for the first time. The diploid chromosome number was 28 in S. assata, whereas 30 in S. cherriei. The karyotypes of the two species, while differing in the number of microchromosomes, 14-15 in S. assata and 16-17 in S. cherriei, share four pairs of large metacentric, two pairs of medium-sized metacentric, and one particular pair (number 7) of chromosomes. Female S. assata carries chromosome pair 7 composed of two identical mediumsized subtelocentric chromosomes. This chromosome pair is heteromorphic in males of both species, i.e., one component of the pair is similar to the homomorphic chromosomes 7 of the S. assata female, while the other is nearly one-half the size of its counterpart and resembles a microchromosome. The homology of such externally different elements is deducted from the presence of an asymmetric bivalent in spermatocytes at diplotene-diakinesis. Female S. cherriei was not available. We suspect that the two Scincella species possess an XY sex determination system, as previously reported for the North American congeneric species, S. lateralis. © Firenze University Press.

Comparative cytogenetics of two species of ground skinks: Scincella assata and S. cherriei (Squamata: Scincidae: Lygosominae) from Chiapas, Mexico / Castiglia, Riccardo; A. M. R., Bezerra; O., Flores Villela; F., Annesi; A., Munoz; O., Flores Villela; Gornoung, Ekaterina; E., Gornung. - In: ACTA HERPETOLOGICA. - ISSN 1827-9635. - STAMPA. - 8:1(2013), pp. 69-73.

Comparative cytogenetics of two species of ground skinks: Scincella assata and S. cherriei (Squamata: Scincidae: Lygosominae) from Chiapas, Mexico

CASTIGLIA, Riccardo;GORNOUNG, Ekaterina;
2013

Abstract

Standard karyotypes of two species of the genus Scincella, S. assata and S. cherriei, both from Chiapas State, Mexico, were described for the first time. The diploid chromosome number was 28 in S. assata, whereas 30 in S. cherriei. The karyotypes of the two species, while differing in the number of microchromosomes, 14-15 in S. assata and 16-17 in S. cherriei, share four pairs of large metacentric, two pairs of medium-sized metacentric, and one particular pair (number 7) of chromosomes. Female S. assata carries chromosome pair 7 composed of two identical mediumsized subtelocentric chromosomes. This chromosome pair is heteromorphic in males of both species, i.e., one component of the pair is similar to the homomorphic chromosomes 7 of the S. assata female, while the other is nearly one-half the size of its counterpart and resembles a microchromosome. The homology of such externally different elements is deducted from the presence of an asymmetric bivalent in spermatocytes at diplotene-diakinesis. Female S. cherriei was not available. We suspect that the two Scincella species possess an XY sex determination system, as previously reported for the North American congeneric species, S. lateralis. © Firenze University Press.
2013
mexican reptiles; sex chromosomes; sphenomorphus
01 Pubblicazione su rivista::01a Articolo in rivista
Comparative cytogenetics of two species of ground skinks: Scincella assata and S. cherriei (Squamata: Scincidae: Lygosominae) from Chiapas, Mexico / Castiglia, Riccardo; A. M. R., Bezerra; O., Flores Villela; F., Annesi; A., Munoz; O., Flores Villela; Gornoung, Ekaterina; E., Gornung. - In: ACTA HERPETOLOGICA. - ISSN 1827-9635. - STAMPA. - 8:1(2013), pp. 69-73.
File allegati a questo prodotto
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/530657
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 8
  • ???jsp.display-item.citation.isi??? 8
social impact