Oct 25, 2025 · In representatives of most iguanian lizard families (Iguania) and in some species of whiptails, tegus, geckos, and skinks, the males have dissimilar sex chromosomes, comparable …

Dec 17, 2025 · A reptile is any member of the class Reptilia, the group of air-breathing vertebrates that have internal fertilization, amniotic development, and epidermal scales covering part or all …

Oct 25, 2025 · Rather than present a detailed anatomical report of a lizard, this section discusses certain structures that are either characteristic of lizards in general or specializations of certain …

Gecko, any of more than 1,000 species of lizards making up six families of the suborder Gekkota. Geckos are mostly small, usually nocturnal reptiles with a soft skin. They also possess a short …

Traditionally, therapsids have been described as “mammal-like reptiles,” because their characteristics are reminiscent of both groups; however, therapsids are not part of the reptile …

Oct 25, 2025 · Suborder Sauria has about 4,450 species. Gene sequencing and other technological advances have resulted in changes in the taxonomy of lizards and a better …

Females of the live-bearing night lizards, which are in the family Xantusiidae, eat the embryonic membranes that remain after the young are born, a trait which is found primarily among …

Although lizards are often portrayed as insectivores, many also consume small vertebrates and at least some plant material; strict herbivory has evolved independently in several groups of lizards.

However, slowly lifestyles diverged, and from the synapsid line came hairy mammals that possessed an endothermic (warm-blooded) physiology and mammary glands for feeding their …

Nov 21, 2025 · Unlike the penis of mammals, the copulatory organs of reptiles do not transport sperm through a tube. The ducts from the testes, as already mentioned, empty into the cloaca, …