Abstract
Cosmocephalus tanakai is redescribed from specimens found in the oesophagus of Larus dominicanus from the South Island of New Zealand. The male is characterised by nine pairs of pedunculate subventral caudal papillae plus two pairs of sessile papillae, and a pair of bicuspid papillae three-quarters of the way down the body. The female too has the pair of posteriad bicuspid papillae, plus a button-like terminal caudal process. A key to the species of Cosmocephalus is given.

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