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A new species of trichosomoidid nematode, Huffmanela paronai sp. n., is established on the basis of its egg morphology and biological characters. The dark-shelled, embryonated eggs of this histozoic parasite occur in masses in the epidermis of the swordfish Xiphias gladius L. (Xiphiidae, Perciformes) from the Ligurian Sea in northern Italy. The eggs are concentrated in groups appearing as black spots in the skin of the fish host, being distributed mainly on the lower part of its body (lower jaw, gill covers, pectoral, anal and caudal fins, lower half of body). The parasite's eggs are characterised mainly by their shape and markedly small size (48-51 x 21-24 microm), an aspinose surface, relatively small polar plugs, and thick egg wall (3 microm). This is the first Huffmanela species reported from fish in Europe.

folia parasitologica

Huffmanela paronai sp. n. (Nematoda: Trichosomoididae), a new parasite from the skin of swordfish Xiphias gladius in the Ligurian Sea (Western Mediterranean)