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- Q507287 abstract "Platyctenida is an order of comb jellies.Platyctenida is the only benthic group of organism in the phylum Ctenophora. Ranging in size 15 cm and below, they have dorsalventrally flattened, oval bodies and secondarily bilaterally symmetrical, platyctenids look very much like nudibranchs or flatworms and are often confused for them. All but 1 species of platyctenids do not possess the iconic ctene rows (the ciliated comb-rows) that distinguishes the Ctenophores but they still possess the pair of tentilla-bearing tentacles and adhesive collocytes that also characterize the phylum in pores along the dorsal surface. They cling to and creep on surfaces by everting the pharynx and using it as a muscular "foot". They are usually cryptically-colored, live on rocks, algae, soft coral, or the body surfaces of other invertebrates; primarily certain species of Cnidarians and Echinoderms (primarily the genus Coeloplana sp.). They are often revealed by their long tentacles with many sidebranches, seen streaming off the back of the animal into the current. They tend to be ectosymbiotic with the organisms they live on.Where as most Ctenophores are hermaphroditic, certain platyctenids have been found to be asexual, and furthermore, where other Ctenophores have been found to reproduce using external fertilization, certain species of platyctenids have been found to use brood pouches.Platyctenida are considered to be a phylogenetically young group along with the orders Lobata and Beroida and are believed to have stemmed from an ancestral version of the order Cydippida, after some kind of bottleneck effect in the phylum. This has been supported by strong morphological and developmental data, specifically the sharing of what has been termed a "Cydippida-like" larva form in all 4 orders. Platyctenida is thought to be a polyphyletic group.".
- Q507287 thumbnail Coeloplana_astericola_(Benthic_ctenophores)_on_Echniaster_luzonicus_(Seastar).jpg?width=300.
- Q507287 wikiPageExternalLink 98.Ctenophora.phyl.pdf.
- Q507287 wikiPageExternalLink harbison2001.pdf.
- Q507287 wikiPageExternalLink ctenopho.
- Q507287 wikiPageExternalLink vpwwf2k8cdc3v5lw.
- Q507287 wikiPageWikiLink Q102778.
- Q507287 wikiPageWikiLink Q124900.
- Q507287 wikiPageWikiLink Q151079.
- Q507287 wikiPageWikiLink Q174778.
- Q507287 wikiPageWikiLink Q180436.
- Q507287 wikiPageWikiLink Q217743.
- Q507287 wikiPageWikiLink Q25441.
- Q507287 wikiPageWikiLink Q36602.
- Q507287 wikiPageWikiLink Q37868.
- Q507287 wikiPageWikiLink Q44631.
- Q507287 wikiPageWikiLink Q686881.
- Q507287 wikiPageWikiLink Q733595.
- Q507287 comment "Platyctenida is an order of comb jellies.Platyctenida is the only benthic group of organism in the phylum Ctenophora. Ranging in size 15 cm and below, they have dorsalventrally flattened, oval bodies and secondarily bilaterally symmetrical, platyctenids look very much like nudibranchs or flatworms and are often confused for them.".
- Q507287 label "Platyctenida".
- Q507287 depiction Coeloplana_astericola_(Benthic_ctenophores)_on_Echniaster_luzonicus_(Seastar).jpg.