. Bulletin. Natural history; Natural history. November, 1961 Smith: Amphibians and Reptiles of Illinois 123. Fig. 111.—An adult Sterjwtliaerus odoratus from Tazewell County, Illinois. The shell and soft parts are olive, brownish, or black. On most specimens a pair of yellow stripes extends along each side of the head. brownish black and olive, occasionally with radiating dark lines or series of dashes. Variation.—The stinkpot male differs from the female in its much larger tail, the prominent claw on the tip of the tail, and the presence of two small horny patches on the inner side of each hin
. Bulletin. Natural history; Natural history. November, 1961 Smith: Amphibians and Reptiles of Illinois 123. Fig. 111.—An adult Sterjwtliaerus odoratus from Tazewell County, Illinois. The shell and soft parts are olive, brownish, or black. On most specimens a pair of yellow stripes extends along each side of the head. brownish black and olive, occasionally with radiating dark lines or series of dashes. Variation.—The stinkpot male differs from the female in its much larger tail, the prominent claw on the tip of the tail, and the presence of two small horny patches on the inner side of each hind leg. The male tends to have a less ossified and proportion- ately shorter plastron. In 16 males the plastron length ranges from to (average ) per cent of the carapace length; in 21 females the range is from to (average ) per cent. The hatchlings, which range from to mm. in carapace length, have black car- apaces and soft parts; usually some light marks are present on most of the marginal scutes. The plastron is marbled with black and yellowish white or gray. The carapace has a prominent middorsal keel and a sec- ondary lateral keel on either side of the mid- dorsal. Subadults are dark olive or brown and have radiating dark lines or a series of spots on each carapace shield. The venter is pre- dominantly light; the head pattern is similar to that of hatchlings. The middorsal keel Is less prominent than in young, and in most individuals the lateral keels have been lost. In adults the carapace Is usually dark above, with some mottling, although it Is sometimes almost a uniform olive. It is smooth and exhibits a tendency to become somewhat flattened on top. The head stripes Table 32.—Ontogenetic variation in carapace proportions of Illinois Sternothaerus odoratus. Figures in parentheses are numbers of specimens. Characteristic Carapace Length (mm.) Under 30(20) 30-70(2) 70-100(21) Over 100(15) Range Mean Range Mean Range Mean Range Mean
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