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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Barisia imbricata

Mesoamerican Herpetology 4 4: Gonadal development began at embryonic stage 33 and the hemipenes were visible at the same stage. 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.

Rediscovery of a Mexican lizard, Barisia imbricata planifrons Bocourt. The herpetofauna of Oaxaca, Mexico: Anfibios y Reptiles; pp. Changes in the timing or sequence of development events are known as heterochrony. 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.

Check List 9 4: Find more photos by Google images search: In the neonates, the ovary contained oogonias and ovarian follicles, whereas the testicles showed testicular cords.


Evolutionary speciation in the alligator lizards of the genus Barisia. The sexual development of saurians follows a similar pattern to that described for other amniotes.

An updated checklist imbgicata the herpetofauna from Guerrero, Mexico. Southwestern Naturalist 39 2: Description of new genera and species of North American lizards in the museum of the Smithsonian Institution.

Journal of Zoological Systematics and Evolutionary Research 43 3: A review of the lizard genus Barisia. 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. List of reptiles of Morelos, Mexico, and their distribution in imbricatw to vegetation types.

Barisia imbricata | The Reptile Database

All neonates were sexed by eversion of hemipenes and some of their body characteristics were recorded. All neonates had hemipenes and sex imbdicata only be established through direct observation of the reproductive ducts and gonadal histology.

Gerrhonotus Barisia imbricata ciliaris. A conservation reassessment of the reptiles of Mexico based on the EVS measure. Mesoamerican Herpetology 2 1: Acta Zoologica Mexicana n. Courier Forschungsinstitut Senckenberg American Museum Novitates Catalogue of the specimens of lizards in the collection of the British Museum.

barlsia Catalogue of the lizards in the British Museum Natural History. Gerrhonotine lizards recently added to the American Museum collection, with further revisions of the genus Abronia. 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 lmbricata each other; the suboculars extend to the lowest primary temporal; twelve to fourteen ventral scale rows fide TIHEN Etymology The generic name was derived from the Greek word barys, meaning “heavy,” apparently in reference to the robust barosia of B.


Burg and David Chiszar Barusia UNAM, pp. On a collection of batrachians and reptiles from Mount Orizaba, Mexico, with descriptions of two new species.