from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A longitudinal ciliated groove on the ventral wall of the pharynx which produces mucus to gather food particles, found in urochordates and cephalochordates and in the larvae of lampreys.
from the GNU version of the Collaborative International Dictionary of English
- n. A fold of the endoderm, which projects into the blood cavity of ascidians. See tunicata.
from The Century Dictionary and Cyclopedia
- n. A longitudinal fold or diverticulum of the middle of the hemal wall of the pharynx of an ascidian, which projects as a vertical ridge into the hemal sinus contained between the endoderm and ectoderm, but remains in free communication with the pharynx by a cleft upon its neural side.
Huxley shewed that it possessed all the characteristic features of the Ascidians, the same arrangement of organs, the same kind of nervous system, a respiratory chamber formed from the fore part of the alimentary canal, and a peculiar organ running along the pharynx which Huxley called the endostyle and which is one of the most striking peculiarities of the whole group.
The endostyle (end.), in Figures 3 and 4, is a ciliated path or groove on the under side of the pharynx, which is generally supposed to represent the thyroid gland of vertebrates.