Research overview: the distinctive Leopardus karyotype

Most cats share a conserved chromosome number, but the ocelot lineage is distinguished by a reduced karyotype resulting from a chromosomal fusion. This overview explains how Leopardus species carry 36 chromosomes rather than the typical 38 found across other felids, a shared derived feature that supports the monophyly of the ocelot lineage. It discusses how cytogenetics contributed to felid systematics before and alongside DNA sequencing, with the distinctive Leopardus karyotype serving as a marker of common ancestry. The piece connects chromosome evolution to the broader phylogeny, illustrating that structural genomic changes, not just sequence differences, carry phylogenetic signal. It highlights how the conserved felid karyotype and its rare exceptions, like that of the ocelot lineage, helped researchers reconstruct relationships among cats.