Hemipenes in females of the Mexican viviparous lizard Barisia imbricata ( Squamata: Anguidae): an example of heterochrony in sexual development. External character data from members of the Barisia imbricata complex support the validity of Tihen’s (b) arrangement, with two species (B. levicollis. PDF | Barisia imbricata imbricata is an endemic anguid lizard living in the highlands of central Mexico, mainly in the Trans-Mexican Volcanic.

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Several neonates were sacrificed and processed to establish gonadal histology and the young of the remaining litters were maintained in captivity to observe the fate of the hemipenes in both sexes. We describe the pattern of sexual development in the viviparous Mexican lizard Barisia imbricata and report heterochrony in the regression of hemipenes in this lizard. In the neonates, the ovary contained oogonias and ovarian follicles, whereas the testicles showed imbricaga cords.

All neonates were sexed by eversion of hemipenes and some of their body characteristics were recorded. We collected gestating females; some lizards were subjected to partial hysterectomy and the embryos were processed using routine histological technique to assess gonadal development; the remaining embryos were used to assess the development of hemipenes.

Amphibians and reptiles of the Seese and Mocino expedition: Mesoamerican Herpetology 4 4: The generic name was derived from the Greek word barys, meaning “heavy,” apparently in reference to the robust body of B. Etymology The generic name was derived from the Greek word barys, meaning “heavy,” apparently in reference to the robust body of B. Rediscovery of a Mexican lizard, Barisia imbricata planifrons Bocourt.


Courier Forschungsinstitut Senckenberg The herpetofauna of Oaxaca, Mexico: A conservation reassessment of the reptiles of Mexico based on the EVS measure. Reptarium The Reptile Database.

Barisia imbricata | Veracruz. | Ricardo Ramírez | Flickr

Catalogue of the lizards in the British Museum Natural History. Developmental asynchrony and antagonism of sex determination pathways in a lizard with temperature-induced sex reversal. Gonadal development began at embryonic stage 33 and the hemipenes were visible at the same stage. Notes on the Herpetofauna of Western Narisia Notes on amphibians and reptiles of Michoacan, Mexico. An annotated checklist and key to the reptiles of Mexico exclusive of the snakes.

Other pregnant females were kept in captivity in individual terraria until the time of delivery. Description of new genera and species of North American lizards in the museum of the Smithsonian Institution. Web pages and scripting Jiri Hosek. Isis von Oken 21 4: Amphibia-Reptilia – get paper here Tihen, J. An updated checklist of the herpetofauna from Guerrero, Mexico. Journal of Zoological Systematics and Evolutionary Research 43 3: Phylogeny and evolution of dorsal pattern in the Mexican endemic lizard genus Barisia Anguidae: Gerrhonotine lizards with the skull not widened or depressed ; frontal bone not in contact with the maxillae ; pterygoid teeth absent or vestigial; dorsal osteoderms with a well-defined, strongly thickened basal area; lateral fold moderately to well developed, with a moderate or large granular area ; sides of the neck finely granular; postero-ventral surfaces of the forearms and shanks granular; minimum number of scales in a single row across the nape six to ten; anterior internasals present; postrostral present or absent; subocular and postocular series well differentiated from each other; the suboculars extend to the lowest primary temporal; twelve to fourteen ventral scale rows fide TIHEN ZMB imbricata Holotype: All neonates had hemipenes and sex could only be established through direct observation of the reproductive ducts and gonadal histology.


Changes in the timing or sequence of development events are known as heterochrony. Gerrhonotus Barisia imbricata ciliaris.

Barisia imbricata

Cotttae, Stuttgartiae, Monachii et Tubingiae, xxv-xxxvi pp. We think that the delayed regression of the hemipenes reflects evolutionary differences among reptiles and may be an indication of a stage in the evolutionary process of this species. Check List bsrisia 4: Tweet Please submit feedback about this entry to the curator. Catalogue of the slender-tongued saurians, with descriptions of many new genera and species.

Potential distribution of the endemic imbricate alligator lizard Barisia imbricata imbricata in highlands of central Mexico. Amphibians and reptiles of the state of Queretaro, Mexico. Bulletin du Museum national d’Histoire naturelle, Paris, 4e ser. Tenth contribution to the herpetology of Tropical America. Mesoamerican Herpetology 2 1: