Gnathiidae - Biological Information System for Marine Life

Juveniles known as temporal ectoparasites of fishes but adults non-feeding benthic dwellers. Females semelparous. Adult males in some species reported to form harem in benthic substrata such as sponges.

Morphology

In adults, first pereopods modified as pylopods covering buccal cavity. Pereonite 7 reduced and lacking appendages. Thus, bearing only 5 pairs of walking legs against 7 pairs of general isopods. Larval mouthparts stylet-like and gnathopod (=pylopod in adults) with hooked unguis prehensible. Pleon narrower than pereon. Pleotelson forms tail-fan. Adults sexually dimorphic. Mandibles in male adults large and forwardly projected.

Distribution, biogeography

Exclusively marine. Cosmopolitan. Known from intertidal zone to thousands meters depth.

Size

Generally small. Body length of most species not beyond 1 cm.

Gnathiidae Leach, 1814 of literature

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Brandt, A. and G. C. B. Poore (2003) Higher classification of the flabelliferan and related Isopoda based on a appraisal of relationships. Invertebrate Systematics 17: 893-923.

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Nunomura, N. (1995) Isopoda. In: Nishimura, S. (ed.), Guide to Seashore Animals of Japan with Color Pictures and Keys, vol. II. Hoikusha, Osaka, 205-233 (in Japanese).

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