The fish family Cynodontidae belongs to the superfamily Curimatoidea, together with the Hemiodontidae, Serrasalmidae, Parodontidae, Prochilodontidae, Chilodontidae, Curimatidae, and Anostomidae. The majority of the species of this superfamily that have been analyzed to date have a diploid chromosome number of 2n = 54. Differentiated sex chromosomes (with female heterogamety) have been observed only in the Prochilodontidae, Parodontidae, and Anostomidae. The present study provides the first description of differentiated sex chromosomes in the cynodontid species Cynodon gibbus, which has a ZZ/ZW system, and shows that repetitive DNA has played a fundamental role in the differentiation of these sex chromosomes.

中文翻译：

---

关于犬齿科动物性染色体的第一项记录：犬齿猴(Agassiz, 1829)

鱼科犬齿科与半齿龙科、锯齿龙科、齿齿龙科、齿齿龙科、齿齿龙科、犬齿科和口齿科一起属于蛇齿科总科。迄今为止已分析过的该超家族的大多数物种的二倍体染色体数为 2n = 54。仅在 Prochilodontidae、Parodontidae 和 Anostomidae 中观察到分化的性染色体（具有雌性异配性）。本研究首次描述了犬齿科动物 Cynodon gibbus 中分化的性染色体，它具有 ZZ/ZW 系统，并表明重复 DNA 在这些性染色体的分化中发挥了基本作用。