. Bulletin. Natural history; Natural history. 118 Illinois Natural History Survey Bulletin Vol. 28, Art. I Chelydra strpentina. Some authors prefer to include the family Kinosternidae in the Chelydridae. Chelydra Schweigger The genus contains only two species, one restricted to Central America and one oc- curring from southern Canada to Ecuador. The wide-ranging species contains two sub- species, one of which, the nominate sub- species, occurs throughout Illinois. Chelydra serpentina serpentina (Linnaeus) Common Snapping Turtle Testudo serpentina Linnaeus 1758:199 (type locality: "warmer
. Bulletin. Natural history; Natural history. 118 Illinois Natural History Survey Bulletin Vol. 28, Art. I Chelydra strpentina. Some authors prefer to include the family Kinosternidae in the Chelydridae. Chelydra Schweigger The genus contains only two species, one restricted to Central America and one oc- curring from southern Canada to Ecuador. The wide-ranging species contains two sub- species, one of which, the nominate sub- species, occurs throughout Illinois. Chelydra serpentina serpentina (Linnaeus) Common Snapping Turtle Testudo serpentina Linnaeus 1758:199 (type locality: "warmer regions"; revised to vicin- ity of New York City by Schmidt 1953). Chelonura serpentina, Kennicott 1855:591. Chelydra serpentina, Davis & Rice 1883^:32. Chelydra serpentina serpentina. Pope 1939:72- 83. Chelydra sp., Cagle 1944^:105. Chelydra, Cagle & Chaney 1950:388. Diagnosis.—A large aquatic turtle (larg- est Illinois specimen approximately 300 mm. from anterior to posterior end of carapace), fig. 107, with an enormous head, thick, pow- erful legs, and a relatively long tail; cara- pace in 5'oung with 3 longitudinal keels, in adults with keels worn of¥ but rough and usually coated with algal growth; posterior edge of carapace serrate; plastron cruci- form and inadequate to conceal legs, neck, and tail; head pointed, covered with tuber- culate skin; jaws strong; small, paired gular barbels; eyes dorsolateral in position; underside of tail plated with large scales; in young, groundcolor black, with some olive or gray mottling and spotting on sides of head, plastron, and underside of soft parts; subadults and adults dirty olive, gray, or brownish black above, with some evidence of radiating rows of dark flecks on each cara- pace plate, or carapace almost patternless; soft parts gray or light olive; beak with nu- merous dark dashes. Variation.—The basal portion of the tail is on the average longer in the male than in the female of the snapping turtle, and the v
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