Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun biology A group of balloon-shaped
marine organisms, of the phylumPlacozoa , that are considered to be the simplest livinganimals
Etymologies
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Examples
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In the 1970s, a German biologist thought he saw placozoan eggs floating in a dish.
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We identified Lhx genes in two cnidarians and a placozoan and report the expression of Lhx genes during embryonic development in Nematostella and the demosponge Amphimedon.
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The Lhx family expanded and diversified early in animal evolution, with all six subfamilies already diverged prior to the cnidarian-placozoan-bilaterian last common ancestor.
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Members of the six major LIM homeobox subfamilies are represented in the genomes of the starlet sea anemone, Nematostella vectensis, and the placozoan Trichoplax adhaerens.
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Schierwater B, Kamm K, Srivastava M, Rokhsar D, Rosengarten RD, et al. (2008) The early ANTP gene repertoire: insights from the placozoan genome.
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Phylogenetic relationships between cnidarian, placozoan and bilaterian Hox / ParaHox related homeodomains inferred by NJ analysis.
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The genome of the placozoan species Trichoplax adharens (shown) was sequenced in 2008 by the Trichoplax Genome Consortium team, which was initiated by Bernd Schierwater of the Tierarztliche Hochschule Hannover in Germany.
Livescience.com 2009
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Phylogenetic relationships between cnidarian, placozoan and bilaterian Hox / ParaHox related homeodomains inferred by ML analysis.
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The Hox / ParaHox-extended complement retrieved here from Clytia equates in gene number the complement present in the full genomic sequence of Phylogenetic relationships between cnidarian, placozoan and bilaterian Hox / ParaHox related homeodomains inferred by ML analysis.
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Thus a matrix was built with 117 cnidarian and 94 bilaterian Antp homeodomain sequences and was completed by 5 sequences from the placozoan, the 8 available sequences from the demosponge Amphimedon queenslandica
skipvia commented on the word placozoan
Are we getting closer to knowing what lies at the base of the tree of life?
January 28, 2009
reesetee commented on the word placozoan
What I want to know is this: Didn't anyone notice that a tree was there?
January 28, 2009
artoparts commented on the word placozoan
See: Eumetazoa & syncytium
January 28, 2009