[ US /ˈænəɫɪd/ ]
  1. relating to or belonging to or characteristic of any worms of the phylum Annelida
  1. worms with cylindrical bodies segmented both internally and externally
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How To Use annelid In A Sentence

  • Sphenothallus Hall, 1847 is a widespread Paleozoic marine taxon that has been interpreted most recently as a tubiculous annelid or other ‘worm’ or as a thecate hydrozoan or scyphozoan cnidarian.
  • The main assumption was that the neural or blastoporal surface must be homologous throughout the Metazoa, though it was dorsal in the Chordata, ventral in the Annelida and Arthropoda. Form and Function A Contribution to the History of Animal Morphology
  • One of the two vascular hemoglobins possesses a hexagonal-bilayer hemoglobin (HBL-Hb) quaternary structure, which is only found in the Annelida and Vestimentifera.
  • As a rule, annelidan segments are generated from a posterior growth zone, arising and developing sequentially, from anterior to posterior.
  • Polychaetes usually have separate sexes; many polychaetes hatch into a particular type of planktonic larva, the trochophore, which later metamorphoses into a juvenile annelid.
  • They seem to eat more annelid worms and insects than any other prey, and chicks are fed mostly earthworms.
  • One widely-mooted suggestion is that planktotrophic larvae, typified by the annelidan trochophore and echinoid pluteus, existed long before the metazoan radiations evident in the Cambrian fossil record.
  • In that time, the first undoubted fossil annelids, arthropods, brachiopods, echinoderms, molluscs, onychophorans, poriferans, and priapulids show up in rocks all over the world.
  • Between 1859 and 1866, he worked on many ‘invertebrate’ groups, including radiolarians, poriferans and annelids (segmented worms).
  • On the basis of the vesicular structure of the shell wall, Fisher felt that they were not closely related to annelid worms.
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