Phreatichthys andruzzii, a species of cyprinid fish, is the only species of the genus Phreatichthys, and is endemic to Somalia.[1] This cave-adapted fish is whitish (not pigmented) and blind. It has no scales.[2] It is considered to have evolved in the cave environment for some two million years.[3] Its name derives from the Greek words phreasatos for spring, and ichthys for fish. It grows to a maximum length of 6.2 cm (2.4 in).[4]
This fish is the first animal discovered that does not adjust its biological clock with the light of the sun. It has an unusual internal clock, which measures the passage of time with an extremely long period (up to 47 hours). It is also completely blind to all light stimuli.[5][6]
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^ abGetahun, A. (2010). "Phreatichthys andruzzii". IUCN Red List of Threatened Species. 2010: e.T40703A10352666. doi:10.2305/IUCN.UK.2010-3.RLTS.T40703A10352666.en. Retrieved 15 November 2021.
^Battison, Leila (10 September 2011). "Fish living in dark caves still feel the rhythm of life". BBC News. Retrieved 2 July 2023.
^Gough, Zoe. . BBC. Archived from the original on 20 June 2014. Retrieved 6 June 2014.
^Froese, Rainer; Pauly, Daniel (eds.) (2011). "Phreatichthys andruzzii" in FishBase. August 2011 version.
^University of Ferrara. . Le Scienze Web. Archived from the original on 20 October 2011. Retrieved 8 September 2011.
^Cavallari, N., Frigato, E., Vallone, D., Fröhlich, N., Lopez-Olmeda, J. F., Foà, A., Berti R., Sánchez-Vázquez, F.J., Bertolucci, C., Foulkes, N. S. (2011). A Blind Circadian Clock in Cavefish Reveals that Opsins Mediate Peripheral Clock Photoreception. PLoS Biology, 9(9), e1001142. http://doi.org/10.1371/journal.pbio.1001142
^Romero, A., editor (2001). The Biology of Hypogean Fishes. Developments in Environmental Biology of Fishes. ISBN978-1402000768
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phreatichthys, andruzzii, species, cyprinid, fish, only, species, genus, phreatichthys, endemic, somalia, this, cave, adapted, fish, whitish, pigmented, blind, scales, considered, have, evolved, cave, environment, some, million, years, name, derives, from, gre. Phreatichthys andruzzii a species of cyprinid fish is the only species of the genus Phreatichthys and is endemic to Somalia 1 This cave adapted fish is whitish not pigmented and blind It has no scales 2 It is considered to have evolved in the cave environment for some two million years 3 Its name derives from the Greek words phreasatos for spring and ichthys for fish It grows to a maximum length of 6 2 cm 2 4 in 4 Phreatichthys andruzzii Conservation status Vulnerable IUCN 3 1 1 Scientific classification Domain Eukaryota Kingdom Animalia Phylum Chordata Class Actinopterygii Order Cypriniformes Family Cyprinidae Genus PhreatichthysVinciguerra 1924 Species P andruzzii Binomial name Phreatichthys andruzziiVinciguerra 1924 This fish is the first animal discovered that does not adjust its biological clock with the light of the sun It has an unusual internal clock which measures the passage of time with an extremely long period up to 47 hours It is also completely blind to all light stimuli 5 6 Two other cavefish species are found in Somalia the cyprinid Barbopsis devecchi and the catfish Uegitglanis zammaranoi 7 References edit nbsp Wikimedia Commons has media related to Phreatichthys a b Getahun A 2010 Phreatichthys andruzzii IUCN Red List of Threatened Species 2010 e T40703A10352666 doi 10 2305 IUCN UK 2010 3 RLTS T40703A10352666 en Retrieved 15 November 2021 Battison Leila 10 September 2011 Fish living in dark caves still feel the rhythm of life BBC News Retrieved 2 July 2023 Gough Zoe Blind cavefish are able to count BBC Archived from the original on 20 June 2014 Retrieved 6 June 2014 Froese Rainer Pauly Daniel eds 2011 Phreatichthys andruzzii in FishBase August 2011 version University of Ferrara Orologi biologici in un pesce cieco Le Scienze Web Archived from the original on 20 October 2011 Retrieved 8 September 2011 Cavallari N Frigato E Vallone D Frohlich N Lopez Olmeda J F Foa A Berti R Sanchez Vazquez F J Bertolucci C Foulkes N S 2011 A Blind Circadian Clock in Cavefish Reveals that Opsins Mediate Peripheral Clock Photoreception PLoS Biology 9 9 e1001142 http doi org 10 1371 journal pbio 1001142 Romero A editor 2001 The Biology of Hypogean Fishes Developments in Environmental Biology of Fishes ISBN 978 1402000768 nbsp This Cyprinidae related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Phreatichthys andruzzii amp oldid 1192143426, wikipedia, wiki, book, books, library,
