Bickham J W, Baker R J
Chromosoma. 1976 Feb 23;54(3):201-19. doi: 10.1007/BF00293451.
G-, C-, Q-banding and standard karyotypic analyses were used to study the chromosomal relationships of emydid turtles. Ten species of emydids were used (5 batagurines and 5 emydines) which samples all of the karyotypic variation known for the Emydidae. Data from a testudinid and a chelydrid are compared to the emydids. The karyotype of Mauremys and Sacalia is considered representative of the primitive karyotype for this group because of its widespread occurrence in the morphologically primitive Batagurinae and its similarity to that of some testudinids. The emydine karyotype is believed to have evolved from the primitive batagurine karyotype by the deletion of a heterochromatic macrochromosome. Siebenrockiella and Rhinoclemys are karyotypically derived batagurines.
采用G显带、C显带、Q显带和标准核型分析来研究水龟科龟类的染色体关系。使用了10种水龟科龟类（5种闭壳龟类和5种水龟类），这些样本涵盖了水龟科已知的所有核型变异。将陆龟科和鳄龟科的数据与水龟科的数据进行比较。锯缘摄龟属和眼斑龟属的核型被认为是该类群原始核型的代表，因为它在形态学上原始的闭壳龟亚科中广泛存在，并且与一些陆龟科龟类的核型相似。水龟类核型被认为是从原始闭壳龟类核型通过一条异染色质大染色体的缺失而进化而来。木纹龟属和果龟属在核型上是衍生的闭壳龟类。
