{{Short description|Genus of fishes}} {{Automatic taxobox | image = Monolene atrimana.jpg | image_caption = ''M. atrimana'' | image2 = Fish4330 - Flickr - NOAA Photo Library.jpg | image2_caption = Deepwater flounder ''(M. sessilicauda)'' | parent_authority = Tongboonkua, Chanet & Chen, 2025 | taxon = Monolene | authority = Goode, 1880 | type_species = Monolene sessilicauda | type_species_authority = Goode, 1880 | synonyms = *''Delothyris'' <small>Goode, 1883</small> *''Thyris'' <small>Goode, 1880</small> }}
'''''Monolene''''', the '''deepwater lefteye flounders''', is a genus of small, mainly deepwater flatfish from the Atlantic and East Pacific.
Their eyes are located on the left side of their body, and thus they have long been placed in the "lefteye flounder" family, Bothidae. However, more recent studies have split up the family into multiple families, with ''Monolene'' being identified as the sister group to the family Taeniopsettidae (formerly the subfamily Taeniopsettinae). For this reason, it was placed its own family, '''Monolenidae''', in 2025.<ref name=":13">{{Cite web |last1=Fricke |first1=R. |last2=Eschmeyer |first2=W. N. |last3=Van der Laan |first3=R. |date=2025 |title=ESCHMEYER'S CATALOG OF FISHES: CLASSIFICATION |url=https://www.calacademy.org/eschmeyers-catalog-of-fishes-classification |access-date=2025-10-22 |website=California Academy of Sciences |language=en}}</ref><ref name=":1">{{Cite journal |last1=Tongboonkua |first1=Pakorn |last2=Chanet |first2=Bruno |last3=Chen |first3=Wei-Jen |title=Integrated Molecular and Morphological Analyses Resolve Long-Standing Classification Challenges in the Sinistral Flatfish Family Bothidae (Teleostei: Carangiformes) |url=https://onlinelibrary.wiley.com/doi/abs/10.1111/zsc.70020 |journal=Zoologica Scripta |date=2025 |article-number=zsc.70020 |language=en |volume=n/a |issue=n/a |doi=10.1111/zsc.70020 |issn=1463-6409|url-access=subscription }}</ref>
==Species== The currently recognized species in this genus are:<ref>{{FishBase genus | genus = Monolene| month = October | year = 2012}}</ref> * ''Monolene antillarum'' <small>Norman, 1933</small> (slim flounder) * ''Monolene asaedai'' <small>H. W. Clark, 1936</small> (Asaedae flounder) * ''Monolene atrimana'' <small>Goode & T. H. Bean, 1886</small> (longfinned deepwater flounder) * ''Monolene danae'' <small>Bruun, 1937</small> * ''Monolene dubiosa'' <small>Garman, 1899</small> (Acapulco flounder) * ''Monolene helenensis'' <small>Amaoka & Imamura, 2000</small> * ''Monolene maculipinna'' <small>Garman, 1899</small> (Pacific deepwater flounder) * ''Monolene megalepis'' <small>Woods, 1961</small> * ''Monolene mertensi'' <small>(Poll, 1959)</small> (Marten's moonflounder) * ''Monolene microstoma'' <small>Cadenat, 1937</small> (smallmouth moonflounder) * ''Monolene sessilicauda'' <small>Goode, 1880</small> (deepwater flounder)
==References== {{Reflist}}
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Category:Bothidae Category:Marine fish genera Category:Taxa named by George Brown Goode
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