Three new gnathiid species with larvae ectoparasitic on coastal sharks from southwestern Japan (Crustacea: Isopoda)

Ota, Yuzo

doi:10.11646/zootaxa.3857.4.2

Cited by 6 publications

(3 citation statements)

References 17 publications

(15 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Most of the species (10) have been reported from elasmobranch fishes. Larvae of these species (4-13 mm; Nunomura and Honma 2004;Coetzee et al 2008Coetzee et al , 2009Ota and Hirose 2009a, b;Ota 2011Ota , 2014Ota , 2015 are much larger than third praniza larvae (=finale stage larvae) of the present new species (2.5-3.1 mm). In the re- maining two species, G. camuripenis Tanaka, 2004 is distinguished from G. capitellum sp.…”

Section: Methodsmentioning

confidence: 58%

“…Of 24 Gnathia species known from Japanese coastal and adjacent waters, larval morphologies have been described in 12 species (Nunomura and Honma 2004;Tanaka 2004;Ota et al 2007;Coetzee et al 2008Coetzee et al , 2009Ota and Hirose 2009a, b;Ota 2011Ota , 2014Ota , 2015. Most of the species (10) have been reported from elasmobranch fishes.…”

Section: Methodsmentioning

confidence: 99%

“…Currently, Gnathiidae includes 12 genera and approximately 200 species from around the world (Boyko et al 2008 onwards). In waters adjacent to Japan, six genera and 38 species have been recorded (Ota 2014(Ota , 2015. In this study, larvae of gnathiids ectoparasitizing host fishes were reared in the laboratory until maturation and adult specimens of the species were also sampled by dredge.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Description of a Small-headed Gnathiid Isopod (Crustacea), <i>Gnathia capitellum</i> sp. nov., from Coastal Japan

2021

Self Cite

View full text Add to dashboard Cite

Adult male and larva of Gnathia capitellum sp. nov. (Crustacea: Isopoda: Gnathiidae) are described. The specimens were laboratory-reared larvae that infested host fishes collected by longline fishing in a coastal bay of Izu Peninsula and adult males found in dredge samples from shallow water (depth: 11-12 m) of Miura Peninsula, central Japan. Adult males of G. capitellum sp. nov. were easily distinguished from the other species of Gnathia Leach, 1814 from around the world by the small oval head and the inner margin of pylopod without plumose setae. Most other Gnathia species have a large rectangular head and plumose setae present on the article 1 of pylopod. Appearance of the adult male resembles the genus Afrignathia Hadfield and Smit, 2008 rather than Gnathia but Afrignathia has maxilla 1 which is absent in all known male gnathiids in the world including G. capitellum sp. nov. Fish parasitic larva of G. capitellum sp. nov. is also described herein. This larva closely resembles larvae of the genus Gnathia, but can be distinguished from the other Gnathia species by the remarkably oval-shaped basis in pereopods 2-4.

show abstract

Section: Methodsmentioning

confidence: 58%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Description of a Small-headed Gnathiid Isopod (Crustacea), <i>Gnathia capitellum</i> sp. nov., from Coastal Japan

2021

Self Cite

View full text Add to dashboard Cite

show abstract

Pigmentation patterns are useful for species identification of third-stage larvae of gnathiids (Crustacea: Isopoda) parasitising coastal elasmobranchs in southern Japan

Ota

2015

Syst Parasitol

View full text Add to dashboard Cite

Previous studies from southern Japan reported larval stages of eight gnathiid isopod species parasitising coastal elasmobranchs. Since gnathiid larvae of these different species closely resembled each other, it was necessary to obtain specimens of free-living adult males for identification to the species level. This was achieved by allowing larvae of the final stage to moult into adult males. From these males, specimens of a species new to science were discovered and described here as Gnathia rufescens n. sp. The main differentiating characteristics of G. rufescens n. sp. are: (i) the apex of pleotelson is oval shaped; (ii) the dorsal sulcus is wide in the posterior part; and (iii) the article 3 of the pylopod is not reduced in the male. Additionally, this paper summarises the specific pigmentation patterns of third-stage larvae of the new species and eight previously described species. Furthermore, host records and host use by the gnathiids were summarised based on data from 158 hosts and over 4,500 gnathiid samples; these are discussed with a focus on host-specificity of the nine gnathiid species studied.

show abstract

First record and molecular characterisation of two Gnathia species (Crustacea, Isopoda, Gnathiidae) from Philippine coral reefs, including a summary of all Central-Indo Pacific Gnathia species

Shodipo

Sikkel

Smit

et al. 2021

International Journal for Parasitology: Parasites and Wildlife

View full text Add to dashboard Cite

Due to their unusual life cycle that includes parasitic larval and free living adult stages, gnathiid isopods are typically overlooked in biodiversity surveys, even those that focus on parasites. While the Philippines sits within the region of highest marine biodiversity in the world, the coral triangle, no gnathiid species have been identified or described from that region. Here we present the first records of two gnathiid species collected from the Visayas, central Philippines: Gnathia malaysiensis Müller, 1993, previously described from Malaysia, and G. camuripenis Tanaka, 2004, previously described from southern Japan. This paper provides detailed morphological redescriptions, drawings and scanning electron microscope images as well as the first molecular characterisation of both species, Furthermore, a summary of the Central-Indo Pacific Gnathia species is provided.

show abstract

Three new gnathiid species with larvae ectoparasitic on coastal sharks from southwestern Japan (Crustacea: Isopoda)

Cited by 6 publications

References 17 publications

Description of a Small-headed Gnathiid Isopod (Crustacea), <i>Gnathia capitellum</i> sp. nov., from Coastal Japan

Description of a Small-headed Gnathiid Isopod (Crustacea), <i>Gnathia capitellum</i> sp. nov., from Coastal Japan

Pigmentation patterns are useful for species identification of third-stage larvae of gnathiids (Crustacea: Isopoda) parasitising coastal elasmobranchs in southern Japan

First record and molecular characterisation of two Gnathia species (Crustacea, Isopoda, Gnathiidae) from Philippine coral reefs, including a summary of all Central-Indo Pacific Gnathia species

Contact Info

Product

Resources

About