单词 | rhynchocoel |
释义 | rhynchocoeladj.n. Zoology. A. adj. = rhynchocoelan adj. rare. ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Platyhelminthes > [adjective] > belonging to class Nemertea nemertine1852 nemertian1861 rhynchocoelous1870 nemertean1873 nemertid1877 rhynchocoel1877 rhynchocoelic1898 rhynchocoelan1967 1877 T. H. Huxley Man. Anat. Invertebrated Animals iv. 184 The Rhynchocœle Turbellaria, or Nemerteans. 1965 Biol. Bull. 128 517 If no true metamerism occurs in primitive molluscs, the closest connections and possible origins of the phylum lie in the turbellarian-rhynchocoele phyla. B. n. 1. A worm of the phylum Rhynchocoela (now usually called Nemertea); a nemertean worm; = rhynchocoelan n. ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Platyhelminthes > [noun] > class Nemertea > member of nemertean1854 nemertian1868 pilidium1868 nemertid1870 nemertine1873 rhynchocoel1878 rhynchocoelan1960 1878 Ann. & Mag. Nat. Hist. 1 491 The Rhyncocœles or Nemertians. 1963 R. D. Barnes Invertebr. Zool. viii. 118/1 Many rhynchocoels possess three layers of muscle conforming to one of two possible configurations. 1978 Biol. Bull. 154 213 The function and morphology of the digestive system of a number of rhynchocoels has been extensively examined with regard to particulate food digestion. 1998 Estuaries 21 231/2 Data for four taxonomic groupings—annelids, arthropods, molluscs, and miscellaneous (consisting primarily of rhynchocoels and cnidarians)—were used to calculate annual secondary production estimates. 2. In a nemertean worm: a fluid-filled tubular body cavity containing the introverted proboscis. Also: a cavity enclosing the extensible proboscis in whelks and related gastropods. ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Platyhelminthes > [noun] > class Nemertea > member of > body cavity in rhynchocoelom1890 rhynchocoel1896 1896 Zoologischer Anzeiger 19 437 The rhynchocoel does not quite reach the posterior end of the body, which comparative shortness is a genetic characteristic. 1932 L. A. Borradaile & F. A. Potts Invertebrata vii. 205 When the muscles of the proboscis sheath contract and press upon the fluid in the rhynchocoel the proboscis is everted. 1969 Amer. Zoologist 9 910/2 In the pleurembolic form, found in most neogastropods, the retractor muscles are attached to the walls of the proboscis, so that on retraction the proboscis is not entirely inverted, and the buccal mass lies in the rhyncocoel. 2002 Integrative & Compar. Biol. 42 697/1 Similar observations support homology of the rhynchocoel and coeloms of other spiralians, but this interpretation is also in dispute. This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022). < |
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