protostome

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pro·to·stome

(prōt′tə-stōm′)
n.
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 New Latin Prōtostomia, taxon name : proto- + New Latin stoma; see stoma.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

protostome

(ˈprəʊtəʊˌstəʊm)
n
(Zoology) a mollusc, annelid, arthropod or other animal in which the mouth develops before the anus at embryonic stage
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

pro•to•stome

(ˈproʊ təˌstoʊm)

n.
any invertebrate in which the mouth appears before the anus during development, cleavage is spiral and determinate, and the coelom forms as a splitting of the mesoderm.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
Studies using transcriptomic data of a dicyemid, Dicyema japonicum, have also suggested that orthonectids are protostomes (Lu et al, 2017); and another analysis on mitochondrial genomes and nuclear genes suggested that orthonectids are members of the phylum Annelida (Schiffer et al, 2018).
A New Species of Orthonectida That Parasitizes Xenoturbella bocki: Implications for Studies on Xenoturbella
The mitochondrial genome of Phoronis architecta--comparisons demonstrate that phoronids are lophotrochozoan protostomes. Mol.
Determination and Analysis of the Complete Mitochondrial DNA Sequence of Octopus dollfusi (Mollusca: Cephalopoda: Octopodidae) from China
The NK cluster in the last common ancestor to protostomes and deuterostomes probably contained a cluster of nine NK genes: Msx, NKl/slouch, NK3/bagpipe, NK4/tinman, Tlx/cl5, NK7, NK6/hgtx, NK5/Hmx, and Lbxl ladybird genes (Holland 2001, Garcia-Fernandez 2005, Larroux et al.
Hox, Parahox, EHGbox, and NK genes in bivalve molluscs: evolutionary implications
The genome size and gene number are similar to those of non-chordate species, including protostomes, but much smaller than those of vertebrates.
Gene regulatory systems that control gene expression in the Ciona embryo
The three volumes are titled as follows: General Aspects, Microorganisms, Algae, and Fungi (v.1); Porifera, Cridaria, and Ctenophora (v.2); and Protostomes and Deuterostomes (v.3).
Encyclopedia of Marine Natural Products, 2nd Edition; 3 volume set
Winchell, "Testing the new animal phylogeny: first use of combined large-subunit and small-subunit rRNA gene sequences to classify the protostomes," Molecular Biology and Evolution, vol.
Archaea: the first domain of diversified life
Most animal phyla belong to one of two groups of bilaterians: the protostomes or deuterostomes.
The animal(s) within us: life on Earth took many forms before the emergence of mammals and mankind
Phylogeny of molting protostomes (ecdysozoa) as inferred from 18s and 28s rARN gene sequences.
Acercamiento a los estudios actuales sobre el filo Tardigrada y su importancia en la medicina
In protostomes, as well as in deuterostomes, the first cleavages initially result in the separation of the cells of the presumptive ectodermal and endodermal germ layers.
Cleavage patterns and mesentoblast formation in the Gastropoda: an evolutionary perspective
In contrast to BLASTp comparisons that suggested that Melibe PERIOD was more similar to Mus than Drosophila (Supplementary Table 3, available online), phylogenetic analysis suggested that molluscan PERIOD proteins shared a common ancestor more recently with protostomes other than chordates (Fig.
Sequences of Circadian Clock Proteins in the Nudibranch Molluscs Hermissenda crassicornis, Melibe leonina, and Tritonia diomedea
The former belongs to the deuterostomes and the latter to the protostomes, respectively.
Frontal affinity chromatography: a unique research tool for biospecific interaction that promotes glycobiology

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