Siphonoglyph

Siphonoglyph

The siphonoglyph is a ciliated groove at one or both ends of the mouth of sea anemones and some corals. The siphonoglyph extends into a pharynx and is used to create currents of water into the pharynx. These water currents are important for respiration and maintenance of internal pressure. The presence of a siphonoglyph (or 2 siphonoglyphs) in several anthozoans (including species from the orders Zoantharia, Ceriantharia, Antipitharia, and Octocorallia) introduces an element of bilateral symmetry into the particular species' body plan (Beklemishev 1969). Some have argued that the presence of bilaterial symmetry in these anthozoans is evidence that the ancestor to bilaterians and cnidarians may have had a bilaterally symmetrical body plan (Finnerty 2003).

References

*cite journal | author = Finnerty JR | title = The origins of axial patterning in the metazoa: How old is bilateral symmetry? | journal = The International journal of developmental biology | volume = 47 | pages = 523–9 | year = 2003 | id = 14756328 16341006 [http://www.ijdb.ehu.es/fullaccess/fulltext.03078/ft523.pdf]
*cite book | last = Beklemishev | first = W. | title = Principles of Comparative Anatomy of Inverterbrates | publisher = Oliver & Boyd | year = 1969 | isbn = 0050021893


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Look at other dictionaries:

  • siphonoglyph — n. [Gr. siphon, tube; glyphein, to engrave] (CNIDARIA: Anthozoa) A special groove or canal from the mouth to the actinopharynx, functioning to circulate fluid through the coelenteron …   Dictionary of invertebrate zoology

  • siphonoglyph — noun A longitudinal flagellated chamber found in most cnidarians in the classes Scyphozoa and Anthozoa, extending from the mouth towards the colenteron (body cavity) …   Wiktionary

  • siphonoglyph — si·phono·glyph …   English syllables

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  • cnidarian — /nuy dair ee euhn/, n. 1. any invertebrate animal, as a hydra, jellyfish, sea anemone, or coral, considered as belonging to the phylum Cnidaria, characterized by the specialized stinging structures in the tentacles surrounding the mouth; a… …   Universalium

  • Symmetry (biology) — Bilateral symmetry redirects here. For bilateral symmetry in mathematics, see reflection symmetry. Symmetry in biology is the balanced distribution of duplicate body parts or shapes. The body plans of most multicellular organisms exhibit some… …   Wikipedia

  • conchula — n. [L. concha, shell] (CNIDARIA: Anthozoa) A modified siphonoglyph of certain sea anemones that is provided at the oral end with a spout like lip …   Dictionary of invertebrate zoology

  • diglyphic — adj. [Gr. dis, twice; glyphein, to engrave] (CNIDARIA: Anthozoa) In sea anemones, having two siphonoglyphs: one siphonoglyph= sulcus; two siphonoglyphs= sulculus …   Dictionary of invertebrate zoology

  • directive mesentaries — (CNIDARIA: Anthozoa) In Zoantharia, the dorsal and ventral pairs of specialized mesentaries attached to the siphonoglyph …   Dictionary of invertebrate zoology

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