How To Use Porifera In A Sentence
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However, among the classes of phylum Porifera, it is difficult to distinguish evolutionary relationships.
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In that time, the first undoubted fossil annelids, arthropods, brachiopods, echinoderms, molluscs, onychophorans, poriferans, and priapulids show up in rocks all over the world.
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For that matter, even the syncytial ‘gut’ departs further from the cnidarian or poriferan system than from the bilaterian archenteron.
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Poriferans don't have mouths; instead, they have tiny pores in their outer walls through which water is drawn.
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Namapoikia rietoogensis gen. et sp. nov. is up to 1 meter in diameter and bears a complex and robust biomineralized skeleton; it probably represents a cnidarian or poriferan.
The Cambrian as an evolutionary exemplar - The Panda's Thumb
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In all cases, poriferans have a canal system, through which they pump water.
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Between 1859 and 1866, he worked on many "invertebrate" groups, including radiolarians, poriferans (sponges) and annelids (segmented worms).
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With a worldwide fauna of at least 15,000 species, poriferans are among the most diverse of sessile marine taxa.
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Promissis everberant, molliunt dulciloquiis, et opportunum tempus aucupantes laqueos ingerunt quos vix Lucretia vitare; escam parant quam vel satur Hippolitus sumeret, &c. Hae sane sunt virgae soporiferae quibus contactae animae ad Orcum descendunt; hoc gluten quo compactae mentium alae evolare nequeunt, daemonis ancillae, quae sollicitant, &c.
Anatomy of Melancholy
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Promissis everberant, molliunt dulciloquiis, et opportunum tempus aucupantes laqueos ingerunt quos vix Lucretia vitare; escam parant quam vel satur Hippolitus sumeret, &c. Hae sane sunt virgae soporiferae quibus contactae animae ad Orcum descendunt; hoc gluten quo compactae mentium alae evolare nequeunt, daemonis ancillae, quae sollicitant, &c.
Anatomy of Melancholy
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Of particular interest in this regard are animals in the early diverging non-bilaterian phyla Porifera, Placozoa, Cnidaria, and Ctenophora.
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In fact, there are so many species of beetles that there are more species of beetles than the total number of species currently living in the Phyla Echinodermata, Mollusca, Annelida, Platyhelminthes, Cnidaria, and Porifera combined!
Species richness
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It even remained unclear if Porifera share one common ancestor with other metazoan phyla.
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Because all three main clades of bilaterian animals express a let-7 RNA that is temporally regulated, but cnidarian, poriferan and all non-animal species that we analysed do not express a detectable let-7 RNA, we propose that the gene evolved after the divergence of diploblastic and bilaterian animals
Teach the Controversy
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The first seems to have occurred before the split between poriferans and the other metazoans.
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First of all, however, spongin is not a feature consistent of all Porifera, but may be a constituent character of the Demospongiae only.
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Because all three main clades of bilaterian animals express a let-7 RNA that is temporally regulated, but cnidarian, poriferan and all non-animal species that we analysed do not express a detectable let-7 RNA, we propose that the gene evolved after the divergence of diploblastic and bilaterian animals
Teach the Controversy
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Thus, poriferan spicules and chancelloriid sclerites do not appear homologous.
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If collar cells and spicules are defining characteristics of the Phylum Porifera, then nematocysts define cnidarians.
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Between 1859 and 1866, he worked on many ‘invertebrate’ groups, including radiolarians, poriferans and annelids (segmented worms).
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In that time, the first undoubted fossil annelids, arthropods, brachiopods, echinoderms, molluscs, onychophorans, poriferans, and priapulids show up in rocks all over the world.
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Won regarded the hollow canal structure as one of the indicators of the close relationship of radiolarians and the Porifera.
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This pattern is typical of most Porifera, Cnidaria, Bryozoa with coronate larvae, colonial Ascidiacea and many polychaetes.
