from the GNU version of the Collaborative International Dictionary of English
- plural proper n. An order of helminths usually having a long, slender, smooth, often bright-colored body, covered with minute vibrating cilia; -- called also Nemertea, Nemertida, and Rhynchocœla.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. proboscis worms
Sorry, no etymologies found.
The earliest Vermalia in which we first find this independent vascular system are the Nemertina (Figure 2.244).
Balanoglossi, Nemertina, Icthydina, etc., have more or less departed from the primitive model owing to adaptation to special environment.
The Nemertina were formerly classed with the much less advanced
The Enteropneusta (Figure 2.245) live in the sea sand, and are long worms of very simple shape, like the Nemertina.
In some of the Nemertina the blood is already coloured, and the red colouring matter is real haemoglobin, connected with elliptical discoid cells, as in the Vertebrates.
They are related, on the one hand, to the Nemertina and their immediate ancestors, the Platodes, and to the lowest and oldest forms of the Chordonia on the other.
After the Nemertina, I take (as distant relatives) the Enteropneusta; they may be classed together with them as Frontonia or Rhyncocoela