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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 |
