Cyclopsettidae

Cyclopsettidae is a family of flatfish primarily native to the coastlines of the Americas, with a few species found off the western coast of Africa. Members of this family were previously placed in Paralichthyidae until a 2019 study, which found this placement to be paraphyletic, and described a new family for them. The closest relatives of the Cyclopsettidae are thought to be the Bothidae, based on both genetic and morphological data.^[1][2]

Cyclopsettidae Temporal range: Late Eocene–present PreꞒ Ꞓ O S D C P T J K Pg N
Pacific sanddab, Citharichthys sordidus
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Carangiformes
Suborder:	Pleuronectoidei
Family:	Cyclopsettidae Campbell, Chanet, Chen, Lee & Chen, 2019
Genera
Citharichthys Cyclopsetta Etropus Syacium

The following genera are placed in this family:^[3]

• Citharichthys Bleeker, 1862
• Cyclopsetta Gill, 1889
• Etropus Jordan & Gilbert, 1882
• Syacium Ranzani, 1842

Several species are important commercial and game fishes, such as the Pacific sanddab, Citharichthys sordidus.

The earliest known fossil remains of the Cyclopsettidae are Late Eocene-aged fossil otoliths assigned to Citharichthys altissimus from Louisiana, USA.^[4]