Assertion: heterotrophic dinoflagellate | /r/HasAspect | antapex
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Source sentences:
text: Although other shapes occur, many motile dinoflagellates have a more or less streamlined configuration, commonly with a single protrusion or horn at the apex (apical horn) and an antapex that may be broadly rounded, or that may have two, commonly unequal, antapical horns.