Top—Trionyx ferox, female, UMMZ 90010 (× 2/9); east edge Okefinokee Swamp, Charlton County, Georgia. Bottom—Left, Trionyx ferox, adult male, UMMZ 102276 (× 1/5), 14 mi. SE Punta Gorda, Lee County, Florida; right, Trionyx sinensis, female, KU 39417 (× 3/10), 5 mi. ESE Seoul, Korea. All dorsal views; note resemblance of two species in having longitudinal ridging and marginal ridge of carapace.
PLATE 33
Trionyx spinifer spinifer, juveniles, dorsal views. Top—UMMZ 74518 (× 12/5); Portage Lake, Washtenaw County, Michigan. Bottom—TU 16132 (× 11/5); Sevierville, Sevier County, Tennessee.
PLATE 34
Trionyx spinifer spinifer, dorsal views. Top—Adult male, UMMZ 54401 (× 3/7), Portage Lake, Livingston County, Michigan. Bottom—Female, UMMZ 81699 (× 2/7), Ottawa County, Michigan.