Diagrammatic summaries of hybridogenesis in carp gudgeons. (a) Simplified depiction of how haploid genomes (colored rectangles; clonally-transmitted genome in black) are inherited in hybridogenesis versus sexual production for diploid vertebrates. Unique genomes are labelled alphabetically. Note that the sexual host becomes a genetic parent but never a genetic grandparent of its offspring. (b) Summary of genomic constitution of each host species and their sexual parasites in Hypseleotris. Genome colors match those used in Fig. 2.