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. Author manuscript; available in PMC: 2014 Jul 7.
Published in final edited form as: Nature. 2012 Dec 19;493(7433):526–531. doi: 10.1038/nature11696

Table 1.

Genome sequencing and annotation summary

Species Size of genome assembly (Mbp) Scaffold N50 (Mbp) Repetitive content(%) GC (%) Predicted number of genes Number of genes in orthologous clusters with other species Number of genes in ancestral bilaterian gene families Mean number of exons per gene (with ≥2 orthologues) Mean exon length (bp) Mean intron length (bp)
Lottia gigantea 348 1.87 21 33 23,800 16,183 10,681 8 213 787
Capitella teleta 324 0.19 31 40 32,389 20,537 11,911 7 221 291
Helobdella robusta 228 3.06 33 33 23,400 13,820 8,707 8 203 526

GC, fraction of guanine plus cytosine nucleobases; Scaffold N50, the length such that half of the assembled sequence is in scaffolds longer than this length; Mbp, megabase pairs.