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Keeled earless lizard
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Squamata
Suborder:	Iguania
Family:	Phrynosomatidae
Genus:	Holbrookia
Species:	H. propinqua
Binomial name
Holbrookia propinqua Baird & Girard, 1852

Holbrookia propinqua, commonly known as the keeled earless lizard, is a species of phrynosomatid lizard.

Description

The dorsal scales are small, pointed, and keeled, as the common name implies. The lateral scales are similar but smaller. The ventral scales, which are flat and smooth, are 3-4 times larger than the dorsal scales. Adults may attain 62 mm (2+1⁄2 in) snout to vent length (SVL), 140 mm (5+1⁄2 in) total length.

Geographic range and habitat

Holbrookia propinqua occurs in the Tamaulipan mezquital ecoregion where it is known from various vegetation zones in south Texas, including mixed oak forest, mesquite brush-lands, cleared fields, coastal prairie, and grasslands, although always where bands of Tertiary sand outcrops or sandy stream-side deposits are found. It is perhaps most common in the loose and shifting sands of beaches, barrier islands, and the Coastal Sand Plain of Southern Texas. It also ranges into northeast Mexico but it is highly restricted to the narrow zone of sand dunes of the coastal beaches, peninsulas, and barrier islands of Tamaulipas and southward to the vicinity of Veracruz, Veracruz.

Subspecies

There are three recognized subspecies of Holbrookia propinqua:

• northern keeled earless lizard, Holbrookia propinqua propinqua Baird & Girard, 1852
• southern keeled earless lizard, Holbrookia propinqua piperata H.M. Smith & Burger, 1950
• Stone's keeled earless lizard, Holbrookia propinqua stonei Harper, 1932

References

1. Smith, H.M. and E.D. Brodie, Jr. 1982. Reptiles of North America, A Guide to Field Identification. Golden Press. New York. pp. 128-129.
2. Axtell, Ralph W. 1983. Holbrookia propinqua. Catalogue of American Amphibians and Reptiles. Society for the Study of Amphibians and Reptiles. 341:1-2 pp.
3. Axtell, Ralph W. 1998. Holbrookia propinqua. Interpretive Atlas of Texas Lizards, No. 19. Southern Illinois University at Edwardsville, Edwardsville, Illinois. 1-14 pp.

• Species Holbrookia propinqua at The Reptile Database

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• Holbrookia
• Reptiles of Mexico
• Reptiles of the United States
• Fauna of the Southwestern United States
• Fauna of the Rio Grande valleys
• Reptiles described in 1852
• Taxa named by Spencer Fullerton Baird
• Lizard stubs