Ceratothoa

Ceratothoa
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Malacostraca
Order:	Isopoda
Family:	Cymothoidae
Genus:	Ceratothoa ; Dana, 1852
Species
	26 species (see text)
Synonyms
	CodonophilusHaswell, 1881; CteatessaSchioedte & Meinert, 1883; MeinertiaStebbing, 1893; RhexanaSchioedte & Meinert, 1883; RhexanellaStebbing, 1911;

Last updated April 15, 2025

Ceratothoais a genus of isopod ectoparasites of teleost fish,^[2]^[3] first described by James Dwight Dana in 1852.^[1] Infection by Ceratothoa can cause anaemia, lesions, growth retardation, emaciation, and mortality in their fish hosts.^[3]

Species

Currently, 26 valid species in this genus are recognized:^[1]

Ceratothoa africanae Hadfield, Bruce & Smit, 2014^[4]
Ceratothoa angulata (Richardson, 1910)
Ceratothoa arimae (Nunomura, 2001)
Ceratothoa banksii (Leach, 1818)
Ceratothoa barracuda Martin, Bruce & Nowak, 2015
Ceratothoa capri (Trilles, 1964)
Ceratothoa carinata (Bianconi, 1869)
Ceratothoa collaris Schiödte & Meinert, 1883
Ceratothoa famosa Hadfield, Bruce & Smit, 2014^[4]
Ceratothoa gilberti (Richardson, 1904)
Ceratothoa globulus Martin, Bruce & Nowak, 2015
Ceratothoa gobii Schiödte & Meinert, 1883
Ceratothoa guttata (Richardson, 1910)
Ceratothoa imbricata (Fabricius, 1775)
Ceratothoa italica Schiödte & Meinert, 1883
Ceratothoa marisrubri Trilles, Colorni & Golani, 1999
Ceratothoa oestroides (Risso, 1826)
Ceratothoa oxyrrhynchaena Koelbel, 1878
Ceratothoa parallela (Otto, 1828)
Ceratothoa retusa (Schioedte & Meinert, 1883)
Ceratothoa springbok Hadfield & Smit, 2020
Ceratothoa steindachneri Koelbel, 1879
Ceratothoa toyamaensis (Nunomura, 1993)
Ceratothoa trigonocephala (Leach, 1818)
Ceratothoa usacarangis (Avdeev, 1979)
Ceratothoa verrucosa (Schioedte & Meinert, 1883)

C. carinata and C. oxyrrhynchaena were redescribed in 2013,^[5] and C. angulata, C. capri, C. carinata, C. collaris, C. gilberti, C. gobii, C. guttata, C. italica, C. oestroides, and C. verrucosa in 2016.^[6]

A number of taxa are species inquirendae :^[1]

Ceratothoa contracta(Miers, 1880)
Ceratothoa deplanataBovallius, 1885
Ceratothoa gaudichaudii(H. Milne Edwards, 1840) (previously known as Ceratothoa rapaxHeller, 1865)^[7]
Ceratothoa novaezelandiaeFilhol, 1885
Ceratothoa transversa(Richardson, 1901)
Ceratothoa triglaeGourret, 1891

References

1 2 3 4 Schotte M, Boyko CB, Bruce NL, Poore GC, Taiti S, Wilson GD, eds. (2021). "Ceratothoa Dana, 1852". World Marine, Freshwater and Terrestrial Isopod Crustaceans Database. World Register of Marine Species . Retrieved 2 September 2021.
↑ Horton, Tammy (2000). "Ceratothoa steindachneri (Isopoda: Cymothoidae) new to British waters with a key to north-east Atlantic and Mediterranean Ceratothoa". Journal of the Marine Biological Association of the United Kingdom. 80 (6): 1041–1052. Bibcode:2000JMBUK..80.1041H. doi:10.1017/S0025315400003106. S2CID 83606126.
1 2 Horton, Tammy; Diamant, Arik; Galil, Bella (2004). "Ceratothoa steindachneri (Isopoda, Cymothoidae): An unusual record from the Mediterranean". Crustaceana. 77 (9): 1145–1148. Bibcode:2004Crust..77.1145G. doi:10.1163/1568540042900231.
1 2 Hadfield, Kerry; Bruce, Niel; Smit, Nico (2014). "Review of the fish parasitic genus Ceratothoa Dana, 1852 (Crustacea, Isopoda, Cymothoidae) from South Africa, including the description of two new species". ZooKeys (400): 1–42. Bibcode:2014ZooK..400....1H. doi: 10.3897/zookeys.400.6878 . PMC 4023241 . PMID 24843254. S2CID 6067384.
↑ Martin, Melissa B.; Bruce, Niel L.; Nowak, Barbara F. (2013). "Redescription of Ceratothoa carinata (Bianconi, 1869) and Ceratothoa oxyrrhynchaena Koelbel, 1878 (Crustacea: Isopoda: Cymothoidae), buccal-attaching fish parasites new to Australia". Zootaxa. 3683 (4): 395–410. doi:10.11646/zootaxa.3683.4.4. PMID 25250460.
↑ Hadfield, Kerry A.; Bruce, Niel L.; Smit, Nico J. (2016). "Redescription of poorly known species of Ceratothoa Dana, 1852 (Crustacea, Isopoda, Cymothoidae), based on original type material". ZooKeys (592): 39–91. Bibcode:2016ZooK..592...39H. doi: 10.3897/zookeys.592.8098 . PMC 4926636 . PMID 27408544.
↑ Brusca, Richard C. (1981). "A monograph on the Isopoda Cymothoidae (Crustacea) of the eastern Pacific". Zoological Journal of the Linnean Society. 73 (2): 117–199. doi:10.1111/j.1096-3642.1981.tb01592.x.

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[WoRMS-1] 1 2 3 4 Schotte M, Boyko CB, Bruce NL, Poore GC, Taiti S, Wilson GD, eds. (2021). "Ceratothoa Dana, 1852". World Marine, Freshwater and Terrestrial Isopod Crustaceans Database. World Register of Marine Species . Retrieved 2 September 2021.

[Horton_2000-2] Horton, Tammy (2000). "Ceratothoa steindachneri (Isopoda: Cymothoidae) new to British waters with a key to north-east Atlantic and Mediterranean Ceratothoa". Journal of the Marine Biological Association of the United Kingdom. 80 (6): 1041–1052. Bibcode:2000JMBUK..80.1041H. doi:10.1017/S0025315400003106. S2CID 83606126.

[Horton_2004-3] 1 2 Horton, Tammy; Diamant, Arik; Galil, Bella (2004). "Ceratothoa steindachneri (Isopoda, Cymothoidae): An unusual record from the Mediterranean". Crustaceana. 77 (9): 1145–1148. Bibcode:2004Crust..77.1145G. doi:10.1163/1568540042900231.

[Hadfield_et_al._2014-4] 1 2 Hadfield, Kerry; Bruce, Niel; Smit, Nico (2014). "Review of the fish parasitic genus Ceratothoa Dana, 1852 (Crustacea, Isopoda, Cymothoidae) from South Africa, including the description of two new species". ZooKeys (400): 1–42. Bibcode:2014ZooK..400....1H. doi: 10.3897/zookeys.400.6878 . PMC 4023241 . PMID 24843254. S2CID 6067384.

[Martin_et_al._2013-5] Martin, Melissa B.; Bruce, Niel L.; Nowak, Barbara F. (2013). "Redescription of Ceratothoa carinata (Bianconi, 1869) and Ceratothoa oxyrrhynchaena Koelbel, 1878 (Crustacea: Isopoda: Cymothoidae), buccal-attaching fish parasites new to Australia". Zootaxa. 3683 (4): 395–410. doi:10.11646/zootaxa.3683.4.4. PMID 25250460.

[Hadfield_2016-6] Hadfield, Kerry A.; Bruce, Niel L.; Smit, Nico J. (2016). "Redescription of poorly known species of Ceratothoa Dana, 1852 (Crustacea, Isopoda, Cymothoidae), based on original type material". ZooKeys (592): 39–91. Bibcode:2016ZooK..592...39H. doi: 10.3897/zookeys.592.8098 . PMC 4926636 . PMID 27408544.

[Brusca_1981-7] Brusca, Richard C. (1981). "A monograph on the Isopoda Cymothoidae (Crustacea) of the eastern Pacific". Zoological Journal of the Linnean Society. 73 (2): 117–199. doi:10.1111/j.1096-3642.1981.tb01592.x.

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