Ceratothoa

Ceratothoa is 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]

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[1]
Codonophilus Haswell, 1881 Cteatessa Schioedte & Meinert, 1883 Meinertia Stebbing, 1893 Rhexana Schioedte & Meinert, 1883 Rhexanella Stebbing, 1911

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 deplanata Bovallius, 1885
• Ceratothoa gaudichaudii (H. Milne Edwards, 1840) (previously known as Ceratothoa rapax Heller, 1865)^[7]
• Ceratothoa novaezelandiae Filhol, 1885
• Ceratothoa transversa (Richardson, 1901)
• Ceratothoa triglae Gourret, 1891