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
Massive expansion and functional divergence of innate immune genes in a protostome. Sci.
Peel, "Articulated Halkieriids from the Lower Cambrian of North Greenland and Their Role in Early Protostome Evolution," Philosophical Transactions of the Royal Society London B 347 (1995): 305-58.
Evidence from 18S ribosomal DNA that the Lophophorates are protostome animals.
Eyes appear in the bilaterally symmetrical animals in the protostome invertebrate branch, including the Phylum Arthropoda (jointed leg animals), Annelida (segmented worms), and Mollusca (bivalves, snails, and cephalopods).
The 28S ribosomal RNA band is not usually observed in mussels because, as it has been described in other protostome species (Mauriz et al.
For example, the relationships among the protostome phyla or the classes of arthropods continue to be points of contention.
NPCRY is closely related to a protostome NPCRY, found in many invertebrates, but not present in Drosophila (Lin and Todo, 2005; Ozturk, 2016; Michael etal., 2017).
ABSTRACT Molluscs belong to one of the two protostome superphyla, the Lophotrochozoa.
Identification and characterization of a protostome homologue of peropsin from a jumping spider.
(2008), use of these terms is problematic as both protostome and vertebrate genomes contain both types, a fact recognized by Hibino et al.
The seemingly sporadic distribution of the different SNBP types is the result of this transition having occurred repeatedly in the course of evolution (Kasinsky, 1995) within different groups of both the deuterostome and protostome branches (Ausio, 1999; Eirin-Lopez et al., 2006a; Erin-Lopez and Ausio, 2009), with the P-type always present in organisms at the tips of the phylogenetic branches (Hunt et al., 1996).
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