retropinnis, Microdesmus Jordan [D. S.] & Gilbert [C. H.] 1882:331 [Bulletin of the U. S. Fish Commission v. 1 (for 1881); ref. 2471] Rock pool at (Pacific) Panama. Holotype (unique): USNM 29665 [whereabouts unknown]. •Valid as Microdesmus retropinnis Jordan & Gilbert 1882 -- (Castro-Aguirre et al. 1999:453 [ref. 24550], Nelson et al. 2004:174 [ref. 27807], Van Tassell 2011:146 [ref. 31732], Page et al. 2013:179 [ref. 32708], Parenti 2021:385 [ref. 38603], Page et al. 2023:125 [ref. 40505]). Current status: Valid as Microdesmus retropinnis Jordan & Gilbert 1882. Gobiidae: Microdesminae. Distribution: Eastern Pacific: Gulf of California (Mexico) south to Panama. IUCN (2010): Data Deficient. Habitat: brackish, marine.