Fig. 2: Ancestral Catfish Chromosomes and Their Rearrangement Patterns Across Catfish Species.

A Reconstruction of the 29 ancestral catfish chromosomes, with chromosomes 28 and 29 containing relatively few genes and identified as ancestral microchromosomes. B Gene distribution on the two (28 and 29) microchromosomes. C Chromosomal rearrangement patterns across seven representative catfish species, highlighting the distinct rearrangements of the two microchromosomes in different catfish lineages. Numbers in red indicate ancestral chromosomes, while numbers in black represent the chromosomes of modern catfish species.