page_title: Pseudunela cornuta
section_title: Description
hierarchical_section_title: Pseudunela cornuta / Description
caption_attribution_description: English: 3D reconstruction of the right view of central nervous system with pharynx of small marine slug Pseudunela cornuta. It is a 3D model generated from 420 histological sections by segmentation and surface extraction. - The histological sections have been aligned and stacked together to form a 3D volume, which was then segmented. For each segment mathematical representation of its surface was generated (boundary surface extraction) and then this 3D model was visualized by rendering the surfaces.
context_page_description: Pseudunela cornuta is a species of minute sea slug, an acochlidian, a shell-less marine and temporarily brackish gastropod mollusk in the family Pseudunelidae. Adults are about 3 mm long and live in the spaces between sand grains.
  A complex interactive 3D reconstruction of the body of an individual of this species has been available since 2009.
context_section_description: Pseudunela cornuta shows an anterior head-foot complex and a posterior elongated visceral hump in which the animal can partly retract when disturbed. The paired labial tentacles are broad at the base, tapering to the end and usually held at 45°-90° to the longitudinal axis of the specimen. The paired rhinophores are tapered and usually point forward like horns in crawling animals. Eyes are present, but not visible externally. The densely ciliated foot is as broad as the anterior head-foot complex and extends about one third of the visceral hump in the crawling animal. The free end of the foot is pointed.
  The size of the worm-like body in living specimens is about 3 mm. The body colour is whitish and translucent. In the anterior part of the visceral hump, the heart bulb is visible externally on the right side of the body. A few elongate, subepidermal spicules of up to 40 μm in length can be found in the posterior part of the visceral hump.
  Organ complexity as seen in Pseudunela cornuta (regarding excretory and reproductive features, at least) represents innovations that evolved in small, mesopsammic marine acochlidians.
caption: 3D reconstruction of the right view of the central nervous system of Pseudunela cornuta.
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