Fig. 7. Pattern on the dorsal surface of the distal part of the right hind limb of some American species and subspecies of the genus Trionyx. Note the gradual reduction in contrast of pattern from that of hartwegi (a) to that of emoryi (d).

  1. T. spinifer hartwegi (KU 15932, × 3/4)
  2. T. spinifer pallidus (KU 40175, × 2/3)
  3. T. spinifer guadalupensis (TU 10165, × 3/4)
  4. T. spinifer emoryi (KU 3153, × 5/6)
  5. T. muticus muticus (KU 48228, × 3/4)
  6. T. ferox (UMMZ 102276, × 1/2)

Fig. 8. Shape of tubercles on anterior edge of carapace in some American species and subspecies of the genus Trionyx (× 1/2). Note the gradual reduction in size of tubercles from that of hartwegi (b) to that of muticus (h).

  1. T. ferox (UMMZ 90010)
  2. T. spinifer hartwegi (KU 3346)
  3. T. spinifer pallidus (TU 13213)
  4. T. spinifer guadalupensis (TU 10160)
  5. T. spinifer emoryi (KU 2906)
  6. T. ater (KU 46906)
  7. T. muticus muticus (KU 48229)
  8. T. muticus muticus (KU 48232)