The crevice spiny lizard is typically grey in color, but sometimes can have a ruddy red-brown appearance with a black and white collar around the neck region. The underside is typically light grey, but males often have blue patches on either side of their bellies. The tail typically has black banding. Their scales have a distinctly spiny texture. They can grow to 11.8 cm (4.6 in) snout-to-vent length, and 31.1 cm (12.2 inches) total length.[12]
Behavior
Crevice spiny lizards are typically shy and nervous, fleeing up a rock face or into a crevice if approached. They prefer semi-arid habitats, often of limestone rock, where there are numerous holes and easily accessible cracks.
Diet
Crevice spiny lizards are insectivorous, consuming a wide variety of spiders, beetles, and other insects, but they will sometimes also consume tender vegetation.
Reproduction
Sceloporus poinsettii is one of the several species of Sceloporus that are ovoviviparous. Breeding occurs in the spring, and a litter of up to 11 young are born in midsummer.
^Beolens, Bo; Watkins, Michael; Grayson, Michael (2011). The Eponym Dictionary of Reptiles. Baltimore: Johns Hopkins University Press. xiii + 296 pp. ISBN978-1-4214-0135-5. (Sceloporus poinsetii, p. 209).
^ Degenhardt, W. G., C. W. Painter, and A. H. Price. 1996. Amphibians and Reptiles of New Mexico. University of New Mexico Press, Albuquerque, New Mexico. xix, 431 pp.ISBN978-0826338112
^Dixon, J. R. 2013. Amphibians and Reptiles of Texas, with Keys, Taxonomic Synopses, Bibliography, and Distribution Maps. 3nd Edition. Texas A&M University Press. College Station, Texas. viii, 477 pp.ISBN978-1603447348
^Köhler, G. and P. Heimes. 2002. Stachelleguane: Lebensweise, Pflege, Zucht. Herpeton, Verlag Elke Köhler, Offenbach, Germany. 174 pp.ISBN3-9806214-9-9
^ Lemos Espinal, J. A. (Editor) 2015. Amphibians and Reptiles of the US-Mexican Border States. Texas A&M University Press. College Station, Texas. x, 614 pp.ISBN978-1-62349-306-6
^ Lemos Espinal, J. A., G. R. Smith, J. R. Dixon, and A. Cruz. 2015. Amphibians and Reptiles of Sonora, Chihuahua, and Coahuila, Mexico. CONABIO, Mexico D. F. 668 pp.ISBN978-607-8328-27-7
^ Lemos Espinal, J. A., G. R. Smith, and A. Cruz. 2018. Amphibians and Reptiles of Nuevo León. Eco Herpetological Publishing and Distribution. Rodeo, New Mexico. x, 370 pp.ISBN978-1-938850-25-7
^Lemos Espinal, J. A. and J. R. Dixon. 2013. Amphibians and Reptiles of San Luis Potosí. Eagle Mountain Publishing, LC. Eagle Mountain, Utah. i-xii, 1-300 pp.ISBN978-0-9720154-7-9
^ Lemos Espinal, J. A., G. R. Smith, and R. Valdez Laresz. 2019. Amphibians and Reptiles of Durango, Mexico. Eco Herpetological Publishing and Distribution. Rodeo, New Mexico. xii, 416 pp.ISBN978-1-938850-27-1
^Smith, H.M., and E.D. Brodie, Jr. (1982). Reptiles of North America: A Guide to Field Identification. New York: Golden Press. 240 pp. ISBN0-307-13666-3. (Sceloporus poinsetti, pp. 118-119).
^"Sceloporus poinsettii ". The Reptile Database. www.reptile-database.org.
Further reading
Baird, Spencer F., and Charles Girard (1852). "Characteristics of some New Reptiles in the Museum of the Smithsonian Institution". Proc. Acad. Nat. Sci. Philadelphia6: 125-129. (Sceloporus poinsettii, new species, pp. 126–127).
Behler, John L., and F. Wayne King (1979). The Audubon Society Field Guide to North American Reptiles and Amphibians. New York: Alfred A. Knopf. 743 pp. ISBN0-394-50824-6. (Sceloporus poinsettii, pp. 527–528 + Plate 354).
Conant, Roger (1975). A Field Guide to Reptiles and Amphibians of Eastern and Central North America, Second Edition. Boston: Houghton Mifflin. xviii + 429 pp. + Plates 1-48. ISBN0-395-19979-4 (hardcover), ISBN0-395-19977-8 (paperback). (Sceloporus poinsettii, pp. 100–101 + Plate 17 + Map 66).
Stebbins, Robert C. (2003). A Field Guide to Western Reptiles and Amphibians, Third Edition. Boston and New York: Houghton Mifflin. xiii + 533 pp. ISBN978-0-395-98272-3. (Sceloporus poinsettii, p. 285 + Plate 31 + Map 88).
Zim, Herbert S., and Hobart M. Smith (1956). Reptiles and Amphibians: A Guide to Familiar American Species: A Golden Nature Guide. New York: Simon and Schuster. 160 pp. (Sceloporus poinsetti, pp. 56, 155).