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Fig. 2 | BMC Evolutionary Biology

Fig. 2

From: The nervous system of the lophophore in the ctenostome Amathia gracilis provides insight into the morphology of ancestral ectoprocts and the monophyly of the lophophorates

Fig. 2

General morphology of Amathia gracilis (semithin sections). a Longitudinal parasagittal section of the zooid. The oral side is to the left, and the anal side is to the right. The different parts of the digestive tract are shown. b Cross section of the cystid at the level of the vestibulum. The polypide is partly retracted into the cystid. The anal side is toward the top, and the oral side is toward the bottom. c Longitudinal section of the anterior part of the retracted lophophore, which is covered by the collar (co). d Cross section of the gizzard (gz). e Cross section of the stolon. The funiculus (fu) is visible. Abbreviations: ca - cardia; cg - cerebral ganglion; co - collar; con - circum - oral nerve ring; ecy - etocyst; enc - endocyst; es - esophagus; mr - muscle-retractor of polypidee; pdi - parietodiaphragmal muscles; phr - pharynx; pl - pylorus; pve - parietovestibular muscles; sch - stomach; st - stolon; t - tentacle; ve - vestibulum

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BMC Ecology and Evolution

ISSN: 2730-7182

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