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The phyla known as early-branching lineages of animals have become the subject of increasing interest from the perspectives of genomics and evolutionary biology. Unfortunately, data on even the most fundamental properties of their genomes, such as genome size, remain very scarce. In this study, genome size estimates are reported for 75 species of sponges (phylum Porifera) representing 33 families and 12 orders, marking the first large survey of genome size diversity for an early-branching phylum. Sponge genome sizes averaged around 0.2 pg but exhibited a 17-fold range overall (0.04–0.63 pg). In addition, the results of comparisons of two methods of genome size quantification (flow cytometry and Feulgen image analysis densitometry) are presented, thereby facilitating future work on these animals. Some particularly promising avenues for future investigation are highlighted.

A first exploration of genome size diversity in sponges