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 This is an uncommon nudibranch up to 4 cm long. It has a flattened leaf-like appearance with short stubby rhinophores at the front of the mantle. The ample mantle is brick-red with a white foot, and up to 50 distinctive white longitudinal ridges, which can be irregular and wavy especially towards the pale edges. The mantles frontal margin is indented to protect the rhinophores, which are united at the base and have a swollen sensory outgrowth at the front. Numerous large defensive glands are contained within the mantle rim, and underneath the rim is a symmetrical series of projections, the gills (up to 20 longitudinal folds) and the lateral lamellae (numbering up to 30 on each side). The head is large and flattened, with the foot forming a shield across the front.Presumed to feed on Cnidaria but this not certain. Closely resembles Armina neapolitana, which can be distinguished by the arrangement of the teeth on the radula (Thompson & Brown, 1984). However, this requires dissection. The spawn resembles a tightly coiled pale pink thread.


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©  The Marine Biological Association of the United Kingdom

Source: Marine Life Information Network

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