Temporal range: Late Cretaceous to present
Anguidae refers to a large and diverse family of lizards native to the Northern Hemisphere. Common characteristics of this group include a reduced supratemporal arch, striations on the medial faces of tooth crowns, osteoderms, and a lateral fold in the skin of most taxa. The group includes the slowworms, glass lizards, and alligator lizards, among others. The family is divided into three subfamilies (Anguinae, Diploglossinae and Gerrhonotinae), and contains approximately 100 species in ten genera.
Morphology and ReproductionEdit
Anguids have hard osteoderms beneath their scales giving them an armored appearance. Many of the species have reduced or absent limbs, giving them a snake-like appearance, while others are fully limbed. Body type varies among species, with sizes ranging from 10 cm to 1.5 m. The group includes oviparous and viviparous species, both of which can be observed in a single genus at times.
Feeding and HabitatEdit
These lizards are known carnivores or insectivorous foragers, feeding primarily on insects, although larger species have been known to feed on small reptiles and amphibians. They inhabit a wide range of different habitats across the globe, from arid to tropical environments. Most known species are terrestrial or semi-fossorial, with the exception of one arboreal genus: Abronia.
Anguids have a relatively good fossil record and are relatively common as fossils in the Late Cretaceous and Paleogene of western North America. The oldest known anguid, with the most complete fossil record of any lizard, is Odaxosaurus, from the late Campanian of Canada, approximately 75 million years ago. Odaxosaurus and other Late Cretaceous anguids already exhibit many features found in living anguids, including chisel-like teeth and armor plates in the skin, suggesting a long evolutionary history for the group. Anguids were particularly diverse during the Paleocene and Eocene in North America; some species, such as those belonging to Glyptosaurus, an extinct subfamily of Anguids, grew to large size and evolved a highly specialized crushing dentition. The long fossil record for Anguidae in North America suggests that the group probably evolved in North America during the Cretaceous before dispersing to Europe in the Paleogene.
- Subfamily Anguinae
- Subfamily Diploglossinae
- Subfamily Gerrhonotinae - alligator lizards
- * Nguyen, T.Q. et al. 2011: Review of the genus Dopasia Gray, 1853 (Squamata: Anguidae) in the Indochina subregion. ISSN 1175-5326 Zootaxa, 2894: 58–68. Preview
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