from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of various worms or wormlike animals of the phylum Annelida, characterized by an elongated, cylindrical, segmented body and including the earthworm and leech.
- adj. Of or belonging to the phylum Annelida.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. any of various wormlike animals, of the phylum Annelida, having a segmented body; they include the earthworm and the leech
- adj. of, or relating to these creatures
from the GNU version of the Collaborative International Dictionary of English
- adj. Of or pertaining to the Annelida.
from The Century Dictionary and Cyclopedia
- n. One of the Annelida or Annelides. Also anneloid.
- Of or pertaining to the Annelida or Annelides. Also annelidan, annelidian.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. worms with cylindrical bodies segmented both internally and externally
- adj. relating to or belonging to or characteristic of any worms of the phylum Annelida
Thus, in the annelid, which is composed of a great many similar rings, and is regarded as quite a complex creature, there is so little dependence of one part on another, that a number of the rings may be destroyed without any injury to the rest.
The striking behaviour, found in the earthworm Eisenia fetida, is the first time that any type of worm, or annelid, has been shown to form active herds.
His idea, about a week with a worm named Willi, didn't grab his editor, Ms. Beneduce, who thought an annelid was too unsympathetic a protagonist.
Instead, the current best guess is that it is a mass of annelid worms, probably Tubifex.
Yet because the reasoning is …. exactly the same as that used to show the evolutionary relationships of mice and bats, whales and hippopotamuses, and, yes, annelid worms and humans. progress can be imagined.
Scientist Kristin Tessmar-Raible from Arendt's lab directly compared two types of hormone-secreting nerve cells of zebrafish, a vertebrate, and the annelid worm Platynereis dumerilii, and found some stunning similarities.
A short survey to a depth of 20 m revealed 168 species of finfish, 60 species of cnidaria, including corals, 8 molluscs, 14 sponges, 11 echinoderms, 15 arthropods and 8 annelid worms.
It states that vertebrate and annelid CNS are of common descent and vertebrates have turned themselves upside down throughout the course of evolution.
Corresponding regions give rise to neuron types with similar molecular fingerprints and these neurons also go on to form the same neural structures in annelid worm and vertebrate.
Since data from fossils was unable to resolve these origins, the researchers compared a present day annelid with a present day fly.