endostyle

Definitions

noun 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.

noun (Zoöl.) A fold of the endoderm, which projects into the blood cavity of ascidians. See tunicata.

noun zoology 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.

endo- + Ancient Greek a pillar.

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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.

Thomas Henry Huxley; A Sketch Of His Life And Work 1904
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.

Thomas Henry Huxley A Sketch Of His Life And Work Mitchell, P Chalmers 1900
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.

Text Book of Biology, Part 1: Vertebrata 1906