Amphisbaena

Ribeiro, Síria, Gomes, Jerriane O., Silva, Helder Lúcio Rodrigues Da, Cintra, Carlos Eduardo D. & Jr, Nelson Jorge Da Silva, 2016, A new two-pored species of Amphisbaena (Squamata, Amphisbaenidae) from the Brazilian Cerrado, with a key to the two-pored species of Amphisbaena, Zootaxa 4147 (2), pp. 124-142 : 135-136

Key to the species of Amphisbaena with two precloacals pores

1. Precloacals pores arranged in a continuous series............................................................ 4

- Precloacals pores separated for median hiatus.............................................................. 2

2. Tail with autotomic constriction, less than 19 dorsal segments in midbody half-annulus, 3/3 supralabials............... 3

- Autotomic constriction of tail absent, more than 19 dorsal segments in midbody half-annulus, 4/4 supralabials............

...................................................................................... Amphisbaena carli 3. More than 238 body annuli, less than 16 tail annuli, postmalar row absent, tail tip compressed...... Amphisbaena absaberi - Less than 215 body annuli, more than 17 tail annuli, postmalar row present, tail tip rounded........... Amphisbaena hiata

4. Postmalar present.................................................................................... 5

- Postmalar absent..................................................................................... 8

5. Body annuli 216–249; tail tip slightly compressed........................................... Amphisbaena leeseri

- Body annuli less than 207, tail tip rounded................................................................ 6

6. Dorsal and ventral sulci present; 10–12 dorsal and 10–14 ventral segments to a midbody annulus.... Amphisbaena silvestrii

- Dorsal and ventral sulci absent; 13–19 dorsal and 16–23 ventral segments to a midbody annulus..................... 7

7. Caudal annuli 19–25.................................................................. Amphisbaena darwini

- Caudal annuli 15–18.............................................................. Amphisbaena heterozonata

8. Body annuli less than 139, 9 tail annuli.................................................... Amphisbaena brevis

- Body annuli more than 150, tail annuli more than 12........................................................ 9

9. Body annuli less than 186............................................................................ 10

- Body annuli more than 202........................................................................... 12

10. 10 dorsal and 10 ventral segments to a midbody annulus...................................... Amphisbaena crisae

- 12–16 dorsal and ventral segments to a midbody annulus.................................................... 11

11. Dorsal and ventral sulci present, 14–16 tail annuli......................................... Amphisbaena neglecta

- Dorsal and ventral sulci absent, 18–20 tail annuli....................................... Amphisbaena anaemariae

12. Body annuli 328−342................................................................ Amphisbaena filiformis

- Body annuli less than 292............................................................................ 13

13. Tail autotomic constriction absent...................................................................... 14

- Tail autotomic constriction present...................................................................... 16

14. Tail tip strongly compressed........................................................... Amphisbaena roberti

- Tail tip rounded.................................................................................... 15

15. Tail annuli 13–18, dorsal sulci present..................................................... Amphisbaena dubia

- Tail annuli 20–26, dorsal sulci absent................................................ Amphisbaena lumbricalis

16. 10 dorsal segments to a midbody annulus.................................................. Amphisbaena caiari

- 12–16 dorsal segments to a midbody annulus............................................................. 17

17. Body annuli 203−220, caudal annuli 26−29, dorsal sulci absent............................... Amphisbaena mitchelli

- Body annuli more than 229, tail annuli 18−24, dorsal sulci present............................................ 18

18. Tail tip rounded.................................................................. Amphisbaena miringoera

- Tail tip slightly or strongly compressed.................................................................. 19

19. Body annuli 230−241, nasal well delimited and in contact in dorsal portion................... Amphisbaena persephone

- Body annuli 283–292, nasal shield partially distinct........................................ Amphisbaena cuiabana