Classification :
Eukarya - Opisthokonta - Animalia - Arthropoda - Crustacea - Malacostraca - Eumalacostraca - Peracarida - Isopoda - Cymothoida - Cymothooidea
Gnathiidae Leach, 1814
Occurrence records
Record to be downloaded also includes record registered by synonym.
Occurrence records
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■ Record acquisition rangeWith latitude and longitude information:100%
-6.030000 ~ 39.616400
106.740000 ~ 142.556000
9.000 ~ 1193.00 m
■ Record acquisition periodWith period:100%
1984/07/26 ~ 2021/10/15
* Date last modified:2023/11/27
■ Number of record37  
[Environment data]
  • Photo by K. Tanaka
  • Photo by K. Tanaka
Over viewLast updated2011/09/07written bytanaka katsuhiko
Ecology, physiology
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.
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.
Generally small. Body length of most species not beyond 1 cm.
Gnathiidae Leach, 1814 of literature
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.
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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