Original description as Solea fonsecensis:
- Günther, Albert C. L. G. 1862. "Catalogue of the fishes in the British Museum. Catalogue of the Acanthopterygii, Pharyngognathi and Anacanthini in the collection of the British Museum". Catalogue of the fishes in the British Museum. Vol 4; i-xxi + 1-534 (ffm00035)
- Solea panamensis Steindachner, 1876, with type locality at Panama. Determiner: Castro-Aguirre et al., 1999
Conservation: Trinectes fonsecensis is evaluated by the international union for the conservation of nature in the iucn red list of threatened species as (LC) least concern (2010).