Macrostomida
Macrostomida
[‚mak·rə′stäm·ə·də] (invertebrate zoology)
An order of rhabdocoels having a simple pharynx, paired protonephridia, and a single pair of longitudinal nerves.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.