411 REFERENCE · Wikibooks
Dichotomous Key/Testudines
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Testudines Animalia Chordata Vertebrata Reptilia Testudines
1
Number of vomers
One - #2: Casichelydia
Two - ../Proganochelys/
2: Casichelydia
Head retraction
Head can not be fully placed inside shell - ../Chelydridae/
Head can be fully placed inside shell - #3