Caspiomyzon

Caspiomyzon
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Infraphylum:	Agnatha
Class:	Petromyzontida
Order:	Petromyzontiformes
Family:	Petromyzontidae
Genus:	Caspiomyzon L. S. Berg, 1906
Species
Caspiomyzon graecus Caspiomyzon hellenicus Caspiomyzon wagneri

Caspiomyzon is a genus of lamprey in the family Petromyzontidae. They are native to Eastern Europe and parts of Western and Central Asia. Two of the three species in the genus are endemic to Greece.^[1]

Taxonomy

Species

There are currently three recognized species in this genus:^[1]

• Caspiomyzon graecus (Renaud & Economidis, 2010) (validity doubtful, may be junior synonym of C. hellenicus)
• Caspiomyzon hellenicus (Vladykov, Renaud, Kott & Economidis), 1982 (Greek brook lamprey)
• Caspiomyzon wagneri (Kessler, 1870) (Caspian lamprey)

This was formerly considered a monotypic genus containing only C. wagneri, but phylogenetic studies suggest that hellenicus and graecus, formerly placed in Eudontomyzon, also belong to this genus.^[2][3]

Evolution

Phylogenetic studies indicate that they are the most basal members of the family Petromyzontidae, and their lineage diverged from the other genera in the family (Petromyzon and Ichthyomyzon) in the Late Cretaceous. The wagneri lineage diverged from the graecus+hellenicus lineage during the Eocene, although both Greek species only diverged during the late Pliocene.^[4]

Ecology

Unlike other lampreys, species of Caspiomyzon are suspected to feed on carrion rather than live prey.^[5]

References

1. "FAMILY Details for Petromyzontidae - Northern lampreys". fishbase.mnhn.fr. Retrieved 2023-04-25.
2. Lang, N.J.; Roe, K.J.; Renaud, C.B.; Gill, H.S.; Potter, I.C.; Freyhof, J.; Naseka, A.M.; Cochran, P.; Pérez, H.E.; Habit, E.M.; Kuhajda, B.R.; Neely, D.A.; Reshetnikov, Y.S.; Salnikov, V.B.; Stoumboudi, M.T.; Mayden, R.L. (2009). "Novel relationships among lampreys (Petromyzontiformes) revealed by a taxonomically comprehensive molecular data set". American Fisheries Society Symposium. 72. Murdoch University: 41–55.
3. Pereira, Ana M.; Levy, André; Vukić, Jasna; Šanda, Radek; Levin, Boris A.; Freyhof, Jörg; Geiger, Matthias; Choleva, Lukáš; Francisco, Sara M.; Robalo, Joana I. (November 2021). "Putting European lampreys into perspective: A global-scale multilocus phylogeny with a proposal for a generic structure of the Petromyzontidae". Journal of Zoological Systematics and Evolutionary Research. 59 (8): 1982–1993. doi:10.1111/jzs.12522. hdl:10400.12/8279. ISSN 0947-5745. S2CID 239694977.
4. Brownstein, Chase Doran; Near, Thomas J. (2023-01-23). "Phylogenetics and the Cenozoic radiation of lampreys". Current Biology. 33 (2): 397–404.e3. Bibcode:2023CBio...33E.397B. doi:10.1016/j.cub.2022.12.018. ISSN 0960-9822. PMID 36586410. S2CID 255278945.
5. Renaud, Claude B.; Cochran, Philip A. (2019), Docker, Margaret F. (ed.), "Post-metamorphic Feeding in Lampreys", Lampreys: Biology, Conservation and Control, Dordrecht: Springer Netherlands, pp. 247–285, doi:10.1007/978-94-024-1684-8_3, ISBN 978-94-024-1682-4, retrieved 2023-11-06