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Large-tooth flounders
Pacific sanddab, Citharichthys sordidus
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Carangiformes
Suborder:	Pleuronectoidei
Family:	Paralichthyidae Chabanaud, 1937
Type genus
Paralichthys Girard, 1858
Genera
Ancylopsetta Cephalopsetta Citharichthys Cyclopsetta Etropus Gastropsetta Hippoglossina Paralichthys Pseudorhombus Syacium Tarphops Tephrinectes Thysanopsetta Xystreurys

Large-tooth flounders or sand flounders are a family, Paralichthyidae, of flounders. The family contains 14 genera with a total of about 110 species. They lie on the sea bed on their right side; both eyes are always on the left side of the head, while the Pleuronectidae usually (but not always) have their eyes on the right side of the head.

They are found in temperate and tropical waters of the Atlantic, Indian and Pacific Oceans.

Several species are important commercial and game fishes, notably the California halibut, Paralichthys californicus and the Pacific sanddab, Citharichthys sordidus.

Phylogenetic analyses have long indicated the non-monophyly of this family e.g., and two lineages have been consistently apparent. Termed groups, the two groups were named after genera: a Cyclopsetta group and a Pseudorhombus group (see summary in ). A formal description of Cyclopsettidae in 2019 created this family consisting of four genera: Cyclopsetta, Etropus, Citharichthys, and Syacium corresponding to the previously recognized Cyclopsetta group. Molecular phylogenetic evidence indicates that Paralichthyidae in this sense is sister to Pleuronectidae and Cyclopsettidae is sister to Bothidae e.g.

References

1. ^ Froese, Rainer; Pauly, Daniel (eds.). "Family Paralichthyidae". FishBase. October 2012 version.
2. Kells, V.; and Carpenter, K. (2011). A Field Guide to Coastal Fishes from Maine to Texas. ISBN 978-0-8018-9838-9
3. "Paralichthyidae" World Register of Marine Species. Retrieved 2014-1-26.
4. Pardo, Belén G.; Machordom, Annie; Foresti, Fausto; Porto-Foresti, Fábio; Azevedo, Marisa F. C.; Bañon, Rafael; Sánchez, Laura; Martínez, Paulino (2005-12-30). "Phylogenetic analysis of flatfish (Order Pleuronectiformes) based on mitochondrial 16s rDNA sequences". Scientia Marina. 69 (4): 531–543. doi:10.3989/scimar.2005.69n4531. hdl:10347/22903. ISSN 1886-8134.
5. ^ Campbell, Matthew A.; Chanet, Bruno; Chen, Jhen‐Nien; Lee, Mao‐Ying; Chen, Wei‐Jen (September 2019). "Origins and relationships of the Pleuronectoidei: Molecular and morphological analysis of living and fossil taxa". Zoologica Scripta. 48 (5): 640–656. doi:10.1111/zsc.12372. ISSN 0300-3256. S2CID 202856805.
6. Berendzen, Peter B.; Dimmick, Walter Wheaton (August 2002). McEachran, J. D. (ed.). "Phylogenetic Relationships of Pleuronectiformes Based on Molecular Evidence". Copeia. 2002 (3): 642–652. doi:10.1643/0045-8511(2002)002[0642:PROPBO]2.0.CO;2. ISSN 0045-8511. S2CID 86091999.

v t e Flatfish
Generally larger flatfish	Halibut True (2 species) Atlantic halibut Pacific halibut Other Arrowtooth halibut Shotted halibut Greenland halibut Spotted halibut California halibut Bastard halibut Plaice (4 species) European plaice American plaice Alaska plaice Scale-eye plaice More... Turbot True (1 species) Scophthalmus maximus More... Spiny (3 species) Psettodidae Other Diamond turbot Hornyhead turbot New Zealand turbot Ocellated turbot Spotted turbot
Generally smaller flatfish	Sole True (135 species) Common (Dover) sole Finless sole Soleichthys heterorhinos Yellow sole More... American (28 species) Achiridae More... Tongue (138 species) Bengal tongue sole Canary tonguesole Carrot tonguesole Cynoglossus suyeni Durban tonguesole Fourline tonguesole Fourlined tonguesole Ghanaian tonguesole Hooked tonguesole Largescale tonguesole Natal tongue-fish Nigerian tonguesole Ripplefin tonguesole River tonguesole Roundhead tonguesole Sand tonguefish Sharpnose tonguesole Southern tongue sole Speckled tonguesole Symphurus thermophilus Three-lined tongue sole More... Other Butter sole Curlfin sole Deepsea sole Dusky sole English sole Flathead sole Lemon sole New Zealand sole Northern rock sole Pacific sand sole Petrale sole Rex sole Rock sole Roughscale sole Slender sole Southern lemon sole Speckled sole Yellowfin sole Other flounder Lefteye (158 species) Crested flounder Flowery flounder Leopard flounder Plate fish Mediterranean scaldfish Twospot flounder Witch More... Righteye (101 species) American smooth flounder Arctic flounder Arrowtooth flounder Banded-fin flounder Barfin flounder Black flounder Blackfin flounder Bering flounder Cleisthenes herzensteini Cleisthenes pinetorum Comb flounder Cresthead flounder Derwent flounder European flounder Far Eastern smooth flounder Flathead flounder Greenback flounder Hypsopsetta macrocephala Indonesian ocellated flounder Kamchatka flounder Large-scale righteye flounder Marbled flounder Marleyella maldivensis Microstomus shuntovi Narrow-body righteye flounder New Zealand flounder Peltorhamphus tenuis Peppered flounder Pseudopleuronectes obscurus Remo flounder Ridged-eye flounder Sakhalin sole Slime flounder Small-mouth righteye flounder Speckled flounder Starry flounder Stone flounder Willowy flounder Winter flounder Witch (righteye) Yellow striped flounder Yellowbelly flounder Yellowtail flounder More... Large tooth (115 species) Anglefin whiff Bigmouth sanddab California halibut Cephalopsetta ventrocellatus Fine flounder Five-eyed flounder Five-rayed sanddab Fourspot flounder Gray flounder Gulf sanddab Horned whiff Longfin sanddab Mimic sanddab Olive flounder Pacific sanddab Peacock flounder Sand whiff Shrimp flounder Small sanddab Speckled sanddab Spotfin flounder Three-eye flounder Thysanopsetta naresi Veracruz whiff More... Southern (6 species) Antarctic armless flounder Armless flounder Finless flounder Paralichthys lethostigma Southern flounder More... Other Citharidae Samaridae Misc Common dab Chinese brill Deepwater dab Longhead dab New Zealand brill Scale-eye plaice Fluke
Related	Demersal fish Transitional fossils Amphistium Heteronectes As food Sole meunière Turbot War
Predator billfish bonito mackerel salmon shark tuna Forage anchovy herring menhaden sardine shad sprat Demersal cod flatfish pollock ray

• Paralichthyidae
• Taxa named by Paul Chabanaud
• Marine fish families
• Carangiformes families