The length of the body may reach 11 mm; it is coloured greenish white, with the showing green or brownish through the translucent skin, especially within the , which are arranged in a latero- pattern of up to eight transverse rows. Each is smooth and rounded at the tip. The is - , just behind the head. The are inrolled.
This species lives and feeds upon the algae Codium tomentosum andBryopsis plumosa . All records of P. dendritica have come from shallow water, with rare captures on the lower shore.
Distributed in NW Europe from Norway to the Mediterranean Sea ( ), New England to the Caribbean Sea; Japan; Australia; California."
Marine Species of the North Sea: http://www.species-identification.org/species.php?species_group=mollusca&selected=beschrijving&menuentry=soorten&id=905
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