Cyzicus (crustacean)

Cyzicus
	Cyzicus californicus
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Branchiopoda
Order:	Spinicaudata
Family:	Cyzicidae
Genus:	Cyzicus; Audouin, 1837
Type species
	Cyzicus tetracera; (Krynicki, 1830)
Species
	See Text
Synonyms
	Bairdestheria Raymond, 1946; unaccepted; Caenestheriella Daday, 1915 fide Margalef, 1953 fide Straskraba, 1965; unaccepted; Estheria Rüppell in Strauss-Durchheim, 1837; nomen praeoccupatum; Isaura Joly, 1842; nomen praeoccupatum; Opsipolygrapta Novojilov, 1954; unaccepted;

Cyzicus is a genus of clam shrimps in the family Cyzicidae. Identified by Jean Victoire Audouin in 1837, the genus was reidentified as Caenestheriella by Eugen von Daday in 1910.^[1]^[3] Cyzicus tetracerus is the type species.^[4]

There are about 24 species in the genus, with an additional 10 uncertain:^[3]^[2]

Species

Cyzicus aegyptiacus Daday, 1914: 290
Cyzicus algericus Daday, 1914: 261
Cyzicus belfragei (Packard, 1871) – Belfrage clam shrimp
Cyzicus bucheti (Daday, 1913)
Cyzicus californicus (Packard, 1874) – California clam shrimp
Cyzicus crinitus (Thiele, 1900)
Cyzicus donaciformis (Baird, 1849)
Cyzicus eductus Daday, 1914: 127
Cyzicus ehrenbergi (Daday, 1913)
Cyzicus elongatus (Mattox, 1957) – elongate clam shrimp
Cyzicus gifuensis (Ishikawa, 1895)
Cyzicus gihoni (Baird, 1859)
Cyzicus grubei (Simon, 1886) sensu Alonso, 1996
Cyzicus gynecius (Mattox, 1950) – Mattox clam shrimp
Cyzicus hierosolymitanus (Fischer, 1860)
Cyzicus jonesi (Baird, 1862)
Cyzicus ludhianatus (Battish, 1981)
Cyzicus madagascarica (Daday, 1914)
Cyzicus mexicanus (Claus, 1872) – Mexican clam shrimp
Cyzicus morsei (Packard, 1871) – Morse clam shrimp
Cyzicus nepalensis Uéno, 1967
Cyzicus rubra (Daday, 1913)
Cyzicus sinensis Hu, 1988
Cyzicus tetracerus (Krynicki, 1830) fide Auduoin, 1837 (sensu Alonso, 1996)

Uncertain taxa

Cyzicus boysii (Baird, 1849); nomen dubium
Cyzicus brasiliensis (Baird, 1849); nomen dubium fide Daday, 1914
Cyzicus bravaisii Audouin, 1837; nomen nudum fide Todd, 1952
Cyzicus caldwelli (Baird, 1852); nomen dubium fide Daday, 1914
Cyzicus dallasi (Baird, 1852); nomen dubium fide Daday, 1914
Cyzicus gubernator (Klunzinger, 1864); taxon inquirendum fide Daday 1914
Cyzicus lobatus Wolf (in litteris) in Daday, 1914; nomen nudum
Cyzicus lofti (Baird, 1849); nomen dubium fide Daday, 1914
Cyzicus melitensis (Baird, 1849); nomen dubium fide Daday 1914
Cyzicus paradoxus Daday, 1914; nomen dubium
Cyzicus politus Baird, 1849; nomen dubium

Species brought into synonymy

Cyzicus altus Shu, Rogers, Chen, & Yang, 2015; accepted as Ozestheria altus (Shu, Rogers, Chen, & Yang, 2015)
Cyzicus annandalei (Daday, 1913); accepted as Ozestheria annandalei Daday, 1913
Cyzicus borceai Daday, 1913; accepted as Cyzicus tetracerus (Krynicki, 1830) fide Auduoin, 1837 (sensu Alonso, 1996)
Cyzicus chyzeri Daday, 1913; accepted as Cyzicus tetracerus (Krynicki, 1830) fide Auduoin, 1837 (sensu Alonso, 1996)
Cyzicus cycladoides (Joly, 1841); accepted as Cyzicus tetracerus (Krynicki, 1830) fide Auduoin, 1837 (sensu Alonso, 1996)
Cyzicus cyrenaicus (Vecchi, 1922); accepted as Cyzicus tetracerus (Krynicki, 1830) fide Auduoin, 1837 (sensu Alonso, 1996)
Cyzicus dictyon (Spencer & Hall, 1896); accepted as Ozestheria lutraria (Brady, 1886)
Cyzicus dimorphus (Daday, 1913); accepted as Cyzicus ehrenbergi (Daday, 1913)
Cyzicus dubiosus Daday, 1913; accepted as Cyzicus tetracerus (Krynicki, 1830) fide Auduoin, 1837 (sensu Alonso, 1996)
Cyzicus echinatus (Daday, 1913); accepted as Cyzicus donaciformis (Baird, 1849)
Cyzicus ellipticus (Sars, 1896); accepted as Ozestheria elliptica Sars, 1896
Cyzicus fallax Daday, 1913; accepted as Cyzicus tetracerus (Krynicki, 1830) fide Auduoin, 1837 (sensu Alonso, 1996)
Cyzicus fimbriatus (Brehm, 1935); accepted as Cyzicus ehrenbergi (Daday, 1913)
Cyzicus hungaricus Daday, 1913; accepted as Cyzicus tetracerus (Krynicki, 1830) fide Auduoin, 1837 (sensu Alonso, 1996)
Cyzicus indicus (Gurney, 1906); accepted as Ozestheria indica (Gurney, 1906)
Cyzicus intermedius Daday, 1913; accepted as Cyzicus tetracerus (Krynicki, 1830) fide Auduoin, 1837 (sensu Alonso, 1996)
Cyzicus irritans Wolf (in Daday, 1914); accepted as Eocyzicus irritans Daday, 1914
Cyzicus klunzingeri Wolf (in Daday, 1914); accepted as Eocyzicus klunzingeri Daday, 1914
Cyzicus lutraria (Brady, 1886); accepted as Ozestheria lutraria (Brady, 1886)
Cyzicus michaelseni Daday, 1913; accepted as Cyzicus ehrenbergi (Daday, 1913)
Cyzicus misrai (Tiwari, 1962 fide Tiwari, 1996); accepted as Ozestheria annandalei Daday, 1913
Cyzicus newcombii (Baird, 1866); accepted as Cyzicus californicus (Packard, 1874)
Cyzicus obliquus (Sars, 1905); accepted as Eocyzicus obliquus (Sars, 1905)
Cyzicus ornatus Smirnov, 1932; accepted as Cyzicus tetracerus (Krynicki, 1830) fide Auduoin, 1837 (sensu Alonso, 1996)
Cyzicus packardi (Brady, 1886); accepted as Ozestheria packardi (Brady, 1886)
Cyzicus pilosus Rogers, Thaimuangphol, Saengphan, & Sanoamuang, 2013; accepted as Ozestheria pilosa (Rogers, Thaimuangphol, Saengphan, & Sanoamuang, 2013)
Cyzicus romanus Daday, 1913; accepted as Cyzicus tetracerus (Krynicki, 1830) fide Auduoin, 1837 (sensu Alonso, 1996)
Cyzicus romanus Daday, 1914; accepted as Cyzicus tetracerus (Krynicki, 1830) fide Auduoin, 1837 (sensu Alonso, 1996)
Cyzicus roonwali (Tiwari, 1962), fide Tiwari, 1996; accepted as Ozestheria annandalei Daday, 1913
Cyzicus rubra (Henry, 1924); accepted as Ozestheria rubra Henry, 1924; nomen praeoccupatum
Cyzicus rufa Dakin, 1914; accepted as Ozestheria rufa (Dakin, 1914)
Cyzicus sarsi (Sayce, 1903); accepted as Ozestheria sarsii (Sayce, 1903)
Cyzicus sarsii (Sayce, 1903); accepted as Ozestheria sarsii (Sayce, 1903)
Cyzicus setosus (Pearse, 1912); accepted as Cyzicus californicus (Packard, 1874)
Cyzicus seurati Daday, 1914 (fide Maeda-Martínez et al., 2002); accepted as Cyzicus mexicanus (Claus, 1872)
Cyzicus sibericus Daday, 1913; accepted as Cyzicus tetracerus (Krynicki, 1830) fide Auduoin, 1837 (sensu Alonso, 1996)
Cyzicus simoni Daday, 1914; accepted as Cyzicus tetracerus (Krynicki, 1830) fide Auduoin, 1837 (sensu Alonso, 1996)

References

^ ^a ^b Audouin, V. (1837). "Seance du 15 Fevrier 1837, Presidence de m. Audouin" [Session of February 15, 1837, Chaired by Mr. Audouin]. Annales de la Société entomologique de France (in French). 1 (VI): X–XI. ISSN 0037-9271. LCCN sn85006180. OCLC 1765810 – via Biodiversity Heritage Library.
^ ^a ^b Boxshall, Geoff (2013). "Cyzicus Audouin, 1837". WoRMS. World Register of Marine Species. Retrieved 17 December 2025.
^ ^a ^b "Cyzicus Audouin, 1837". Integrated Taxonomic Information System. Retrieved 17 December 2025.
^ Mattox, N. T. (1957). "A New Estheriid Conchostracan with a Review of the Other North American Forms". The American Midland Naturalist. 58 (2): 368. doi:10.2307/2422620. JSTOR 2422620.

[og-desc-1] Audouin, V. (1837). "Seance du 15 Fevrier 1837, Presidence de m. Audouin" [Session of February 15, 1837, Chaired by Mr. Audouin]. Annales de la Société entomologique de France (in French). 1 (VI): X–XI. ISSN 0037-9271. LCCN sn85006180. OCLC 1765810 – via Biodiversity Heritage Library.

[worms-2] Boxshall, Geoff (2013). "Cyzicus Audouin, 1837". WoRMS. World Register of Marine Species. Retrieved 17 December 2025.

[itis-3] "Cyzicus Audouin, 1837". Integrated Taxonomic Information System. Retrieved 17 December 2025.

[4] Mattox, N. T. (1957). "A New Estheriid Conchostracan with a Review of the Other North American Forms". The American Midland Naturalist. 58 (2): 368. doi:10.2307/2422620. JSTOR 2422620.

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