They are small to medium fish, ranging in size from just 3.7 cm (1.5 in) in adult length to 35 cm (14 in) in length, depending on species. They have a similar appearance to lizardfishes, with a large mouth, numerous teeth, and a forked tail. The dorsal fin is located in the middle of the back, with a small adipose fin.[2]
Like many other deep-sea fish, their eyes are telescopic, allowing them to see in near darkness. However, unlike any other fishes, their eyes also possess a "pearl organ"; a white spot on the surface of the eye that may help to pick up light from the side of the fish, out of the normal visual field. The pearl organ is associated with a secondary retina, allowing the fish an unusually wide field of view.[2] Specifically, pearleyes can see up to 20 degrees below the horizontal despite the nearly 40 degree angle created by the tubular eyes of the pearleye above the horizontal.[3] While the majority of pearleye species are found in tropical waters, pearleyes have been found in every ocean in the world, including the Lagiacrusichthys, a newly described genus found in the Antarctic Ocean.[4]
Pearleyes typically live between 500 and 1,000 m (1,600 and 3,300 ft), although some species may visit shallower waters during the night.[2]
Referencesedit
^Davis, Matthew P. (2015). "Evolutionary Relationships of the Deep-Sea Pearleyes (Aulopiformes: Scopelarchidae) and a New Genus of Pearleye from Antarctic Waters". Copeia. 103 (1): 64–71. doi:10.1643/ci-14-139. S2CID 86731010.
^ abcdJohnson, R.K. & Eschmeyer, W.N. (1998). Paxton, J.R. & Eschmeyer, W.N. (eds.). Encyclopedia of Fishes. San Diego: Academic Press. p. 126. ISBN0-12-547665-5.
^Locket, N. A. (2000). "On the lens pad of Benthalbella infans, a scopelarchid deep-sea teleost". Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences. 355 (1401): 1167–1169. doi:10.1098/rstb.2000.0660. JSTOR 3066638. PMC1692853. PMID 11079391.
^Davis, M. P., (2015). Evolutionary Relationships of Deep-Sea Pearleyes (Aulopiformes: Scopelarchidae) and a New Genus of Pearleye from Antarctic Waters. Copeia, 103(1), pp 64-71. doi.org/10.1643/CI-14-139
April 18, 2024
pearleye, pearleyes, family, scopelarchidae, aulopiform, fishes, distinguished, their, unique, visual, system, with, retinas, each, sbenthalbella, infansscientific, classificationdomain, eukaryotakingdom, animaliaphylum, chordataclass, actinopterygiiorder, aul. The pearleyes are a family Scopelarchidae of aulopiform fishes distinguished by their unique visual system with two retinas in each eye 2 PearleyesBenthalbella infansScientific classificationDomain EukaryotaKingdom AnimaliaPhylum ChordataClass ActinopterygiiOrder AulopiformesSuborder AlepisauroideiFamily ScopelarchidaeAlcock 1896GeneraBenthalbellaLagiacrusichthys 1 RosenblattichthysScopelarchoidesScopelarchusThey are small to medium fish ranging in size from just 3 7 cm 1 5 in in adult length to 35 cm 14 in in length depending on species They have a similar appearance to lizardfishes with a large mouth numerous teeth and a forked tail The dorsal fin is located in the middle of the back with a small adipose fin 2 Like many other deep sea fish their eyes are telescopic allowing them to see in near darkness However unlike any other fishes their eyes also possess a pearl organ a white spot on the surface of the eye that may help to pick up light from the side of the fish out of the normal visual field The pearl organ is associated with a secondary retina allowing the fish an unusually wide field of view 2 Specifically pearleyes can see up to 20 degrees below the horizontal despite the nearly 40 degree angle created by the tubular eyes of the pearleye above the horizontal 3 While the majority of pearleye species are found in tropical waters pearleyes have been found in every ocean in the world including the Lagiacrusichthys a newly described genus found in the Antarctic Ocean 4 Pearleyes typically live between 500 and 1 000 m 1 600 and 3 300 ft although some species may visit shallower waters during the night 2 References edit Davis Matthew P 2015 Evolutionary Relationships of the Deep Sea Pearleyes Aulopiformes Scopelarchidae and a New Genus of Pearleye from Antarctic Waters Copeia 103 1 64 71 doi 10 1643 ci 14 139 S2CID 86731010 a b c d Johnson R K amp Eschmeyer W N 1998 Paxton J R amp Eschmeyer W N eds Encyclopedia of Fishes San Diego Academic Press p 126 ISBN 0 12 547665 5 Locket N A 2000 On the lens pad of Benthalbella infans a scopelarchid deep sea teleost Philosophical Transactions of the Royal Society of London Series B Biological Sciences 355 1401 1167 1169 doi 10 1098 rstb 2000 0660 JSTOR 3066638 PMC 1692853 PMID 11079391 Davis M P 2015 Evolutionary Relationships of Deep Sea Pearleyes Aulopiformes Scopelarchidae and a New Genus of Pearleye from Antarctic Waters Copeia 103 1 pp 64 71 doi org 10 1643 CI 14 139 Retrieved from https en wikipedia org w index php title Pearleye amp oldid 1200557053, wikipedia, wiki, book, books, library,
