An aquatic invertebrate animal of the phylum "Porifera"; a sponge.
- ‘Poriferans don't have mouths; instead, they have tiny pores in their outer walls through which water is drawn.’
- ‘The first seems to have occurred before the split between poriferans and the other metazoans.’
- ‘With a worldwide fauna of at least 15,000 species, poriferans are among the most diverse of sessile marine taxa.’
- ‘In all cases, poriferans have a canal system, through which they pump water.’
- ‘Between 1859 and 1866, he worked on many "invertebrate" groups, including radiolarians, poriferans (sponges) and annelids (segmented worms).’
Relating to or denoting poriferans.
- ‘Thus, poriferan spicules and chancelloriid sclerites do not appear homologous.’
- ‘Between 1859 and 1866, he worked on many ‘invertebrate’ groups, including radiolarians, poriferans and annelids (segmented worms).’
- ‘In that time, the first undoubted fossil annelids, arthropods, brachiopods, echinoderms, molluscs, onychophorans, poriferans, and priapulids show up in rocks all over the world.’
- ‘For that matter, even the syncytial ‘gut’ departs further from the cnidarian or poriferan system than from the bilaterian archenteron.’