The gene complement of the ancestral bilaterian - was Urbilateria a monster?
1 ARC Centre of Excellence for Coral Reef Studies and Comparative Genomics Centre, James Cook University, Townsville, Queensland 4811, Australia
2 Centre for Molecular Genetics of Development and School of Biology, Australian National University, Canberra, ACT 2601, Australia
Journal of Biology 2009, 8:89 doi:10.1186/jbiol192Published: 19 November 2009
Expressed sequence tag analyses of the annelid Pomatoceros lamarckii, recently published in BMC Evolutionary Biology, are consistent with less extensive gene loss in the Lophotrochozoa than in the Ecdysozoa, but it would be premature to generalize about patterns of gene loss on the basis of the limited data available.