Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of numerous invertebrate animals of the group Protostomia, in which the mouth develops from the first opening in the embryo and the anus develops later, and including the mollusks, annelids, and arthropods.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Any animal, of the former taxon Protostomia, in which the mouth is derived from the embryonic blastopore

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[From New Latin Prōtostomia, taxon name : proto– + New Latin stoma; see stoma.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

proto- + -stome

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Examples

  • We identified the gene PsGEF (protostome-specific GEF), which is present in all the sequenced genomes of insects and limpet but absent in those of sea anemones, deuterostomes, and nematodes.

    BioMed Central - Latest articles 2009

  • We identified the gene PsGEF (protostome-specific GEF), which is present in all the sequenced genomes of insects and limpet but absent in those of sea anemones, deuterostomes, and nematodes.

    BioMed Central - Latest articles Keigo Kohno and Tatsuhiko Kadowaki Nozomu Higuchi 2009

  • If a major protostome group, the lophotrochozoa (which includes the snails) use nodal to set up left and right, that implies that the ecdysozoans are the odd group - they secondarily lost nodal function.

    Pharyngula 2009

  • If a major protostome group, the lophotrochozoa (which includes the snails) use nodal to set up left and right, that implies that the ecdysozoans are the odd group - they secondarily lost nodal function.

    Pharyngula 2009

  • All five predicted sponge WNT proteins showed typical structural characteristics, including a highly conserved cysteine pattern (alignment available upon request) and peptide secretion signals, but their sequences were highly divergent compared to a reference dataset comprising the complete WNT repertoire retrieved from selected deuterostome, protostome and cnidarian genomes.

    PLoS ONE Alerts: New Articles Pascal Lapébie et al. 2009

  • Therefore, some have speculated that Pikaia represents an even more basal chordate(45) (possibly derived from vendozoans, which are enigmatic fossils from the late Precambrian)(54) or possibly a protostome-like creature.(

    Down with phyla! (episode II) - The Panda's Thumb 2005

  • A, B, and C) have been defined and shown to be present in mammals, whereas the emergence of the A and B clades predates the protostome / deuterostome split.

    Journal of Biological Chemistry current issue J.-Y. Exposito 2008

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