Ophisaurus attenuatus (Cope, 1880)
Key Characters: Limbs absent; dark longitudinal stripes flank a noticeable groove on each side of the body.
Similar Species: May be distinguished from snakes by the presence of movable eyelids and external ear openings. See Key to Lizards of Illinois for help with identification.
Subspecies: Two subspecies are recognized; Western Slender Glass Lizard, O. a. attenuates, and Eastern Slender Glass Lizard. O. a. longicaudus, McConkey, 1952. The former is found in Illinois.
Description: A long (up to 90 cm TL), slender lizard with yellow to brown back sporting six longitudinal stripes, including a distinct middorsal stripe. White flecks in the middle of the scales sometimes form light stripes.
Habitat: Prairies, sand prairies, old fields, and dry open woodlands.
Natural History: Known as the glass lizard because of the easily broken tail. Glass lizards eat invertebrates and small lizards. Mating occurs in May and 5 to 15 eggs are laid in late June or July. Hatchlings range from 10 to 13 cm TL. Hawks and carnivorous mammals are the main predators.
Status: The slender glass lizard is not listed as threatened in Illinois although it is seldom encountered. It is listed as a Species in Greatest Need of Conservation in the Illinois Wildlife Action Plan.
Etymology: Ophisaurus – ophis (Greek) meaning serpent, reptile; sarous (Greek) meaning lizard, reptile; attenuatus – (Latin) meaning tapered, drawn out, thin.
Original Description: Cope, E.D. 1880. On the zoological position of Texas. Bulletin of the US National Museum. 17:1-51.
Type Specimen: Neotype, USNM 15537
Type Locality: “Dallas, Texas”
Original Name: Opheosaurus ventralis attenuatus Cope, 1880
Nomenclatural History: First named as a subspecies of O. ventralis, but recognized by Boulenger (1885. Cat. Lizards British Mus. Vol. 2) as a full species, even though Cope’s stance on the matter continued to influence many herpetologists until Neil (1949. Herpetologica 5(4):97-100) provided evidence that attenuatus was a full species. Kennicott (1855. Cat. Animals Cook Co. IL. State Ag. Soc. Trans. 1853-1854, 1:577-95) referred to Illinois specimens of O. attenuatus as O. lineatus (Gray, 1838), a junior synonym for O. ventralis.
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