Ventral view of intermediate valve under high magnification of Scanning Electron Microscope (SEM). Barents Sea, Arctic. © B. Sirenko.
Canals penetrate the articulamentum locally in the jugal tract and slit rays as conduits for branches of the body’s lateral nerve cord conveying stimuli received by the aesthetes on the surface of the tegmentum.
Two insertion plates on end of valve are separated by a single slit.

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