单词 | porpita |
释义 | Porpitan. Zoology and Palaeontology. A kind of pelagic colonial hydroid consisting of a central gastrozooid surrounded by gonozooids and defensive polyps, all hanging from a flattened, circular, chitinous float; a fossil of such a hydroid (now rare). Also (in form Porpita): the genus of chondrophores (family Porpitidae) to which these hydroids belong.Valid publication of the genus name: Lamarck Système des animaux sans vertèbres (1801) 355, after earlier use as specific epithet, e.g. in Medusa Porpita Linnaeus (1758). ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [noun] > class Hydrozoa > order Siphonophora > genus Porpita Porpitaa1728 a1728 J. Woodward Attempt Nat. Hist. Fossils Eng. (1729) 69 A Body flat and round..and very beautiful, striated from the Center to the Limbus, like the Porpitæ. 1790 J. Nichols Antiq. Leicestershire 1290 The Porpita, or Button-stone of Dr. Plott, is a scarce fossil in this country, but is found at Easthorpe. 1834 H. McMurtrie tr. G. Cuvier Animal Kingdom (abridged ed.) 482 The Porpita and Velella..which were formerly joined with the Medusæ. 1842 W. T. Brande Dict. Sci., Lit. & Art 963/2 Porpita, the name of a genus of sea-nettles.., characterized by an internal circular flattened disk of a calcareous and horny texture. 1883 Harper's Mag. Dec. 107/1 Delicate shapes of ianthina, vellela, and porpita. 1929 Sci. Monthly Nov. 391/2 One may..find Salpae, Porpitae, various interesting Heteropods and Pteropods, compound Radiolarians, Auriculariae, and what not. 1967 Oceanogr. & Marine Biol. 5 234 [Picard] reconsidered the phylogeny and systematic position of Velella and Porpita, which he had previously discussed. 1994 E. E. Ruppert & R. D. Barnes Invertebr. Zool. (ed. 6) iv. 118/1 An unusual group of hydroids consists of members of the genera Porpita (blue buttons) and Velella (by-the-wind sailors). This entry has been updated (OED Third Edition, December 2006; most recently modified version published online March 2022). < n.a1728 |
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