Invertebrate Phylogeny

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Phylum

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High-level taxon sharing a distinctive body plan.

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Arthropods

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<p>Most numerous species among invertebrate phyla.</p>

Most numerous species among invertebrate phyla.

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29 Terms

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Phylum

High-level taxon sharing a distinctive body plan.

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Arthropods

Most numerous species among invertebrate phyla.

<p>Most numerous species among invertebrate phyla.</p>
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Deuterostomes

Phylum including humans; fewer species than arthropods.

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Nematoda

Phylum with many undiscovered species; soil samples used.

<p>Phylum with many undiscovered species; soil samples used.</p>
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Placozoa

Defined by one species, Trichoplax adhaerens.

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Cycliophora

First species discovered in 1995 on lobster antenna.

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Dendrogramma

Basal organism, not clearly fitting in animal tree.

<p>Basal organism, not clearly fitting in animal tree.</p>
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Cambrian Explosion

Period of rapid diversification of life forms.

<p>Period of rapid diversification of life forms.</p>
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Stephen J. Gould

Proposed theories on Cambrian evolutionary burst.

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True Tissues

First major split in animal phylogeny.

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Symmetry

Second major split; radial vs bilateral.

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Cephalisation

Development of a head in bilateral animals.

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Body Cavities

Third split; acoelomate, pseudocoelomate, coelomate.

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Protostomes

First mouth develops from blastopore.

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Deuterostomes

First anus develops from blastopore.

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Mitochondrial Eve

Common ancestor for all human mitochondrial DNA.

<p>Common ancestor for all human mitochondrial DNA.</p>
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Metazoa

Group including all multicellular animals.

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Lophotrochozoa

Subgroup of protostomes including mollusks and annelids.

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Ecdysozoa

Subgroup of protostomes including arthropods and nematodes.

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Molecular Comparison

Modern method for classifying animal phylogeny.

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Pentostomida

Crustacean parasites resembling worms; own phylum.

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Mitochondrial Genome

Genetic material evolving through rearrangements.

<p>Genetic material evolving through rearrangements.</p>
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Inversion

Type of genomic rearrangement; reversal of sequence.

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Transposition

Type of genomic rearrangement; movement of sequences.

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Inverted Transposition

Type of genomic rearrangement; sequence inversion during movement.

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Priapulid Worms

Protostomes developing like deuterostomes; classification anomaly.

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Tetrapods

Four-limbed vertebrates; includes legless snakes.

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Animal Phylogeny

Study of evolutionary relationships among animal groups.

<p>Study of evolutionary relationships among animal groups.</p>
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Phylogenetic Tree

Diagram showing evolutionary relationships among organisms.