The power and utility of morphological characters in systematics: a fully resolved phytogeny of Xenosaurus
and its fossil relatives (Squamata: Anguimorpha).
A review of the American lizards of the genus Xenosaurus
Lizards of the genus Xenosaurus are viviparous dwellers of crevices and holes and they range throughout much of central and southern Mexico and into Guatemala (Ballinger et al., 2000b).
Given that some species and populations of Xenosaurus are classified as endangered or threatened by the Mexican government (e.g., Zuniga-Vega et al., 2007), and most species are known from relatively few and isolated populations (Ballinger et al., 2000b), it is critical that we gain a better understanding of their ecological needs and requirements so that appropriate management and conservation measures can be taken.
Three lengths of copper tubing were used: 51, 67, and 98 mm, corresponding to lengths of neonates, juveniles, and adults, respectively (based on measurements on this and other studies of Xenosaurus; e.g., Zamora-Abrego et al., 2007).
Anguimorpha encompassing anguids, xenosaurus
and the successful varanids (monitor lizards) have a more robust structure.
The knob-scaled lizard, Xenosaurus grandis is distributed as disjunct populations from west central Veracruz southward to Guerrero, Oaxaca and Chiapas, Mexico to Alta Verapaz, Guatemala (Ballinger et al.
The following Xenosaurus grandis specimens from Veracruz, Mexico were examined: LACM 5927, 10981,75420, 75688, 75690, 75691, 75694, 104942, 120049-120057, 120059, 120060, 120064, 120065, 120070, 120071, 120075-120077, 120080-120084, 120086, 120087, 121537, 135539, 135541, 135544, 135545, 135547, 136334-136336.
Sexual Dimorphism in Two Species of Knob-Scaled Lizard (Genus Xenosaurus
) From Mexico.
tuxtlae Werler y Shannon 1893 Pr E Xenosauridae Xenosaurus
grandis (Gray 1856) Pr N X X X SERPENTES Boidae Boa constrictor (Linnaeus 1758) A, CI N X Colubridae Adelphicos quadrivirgatus Jan 1862 Pr N X X Amastridium veliferum Cope 1861 N Chersodromus liebmanni Reinhartd 1860 Pr E Coniophanes bipuncatus (Gunther 1858) N C.