Hubbs described this species in the genus Floridichthys which was erected by him earlier in 1926. In fact he described it as Floridichthys carpio polyommus. Duggins et al. upgraded it in 1983 to the status of species for its own and named it Floridichthys polyommus.

Till 1936 only one taxa, Floridichthys carpio, was described in the genus.

Synonyms are: Floridichthys carpio barbouri Hubbs 1936.

The type locality is "Cienega, 2 km. south of Progreso, Yucatan and Cienega, Yucatan (Southeastern Mexico at 89°39'W; 21°15' N.

Floridichthys polyommus is a brackish water dweller that is living in shallow lagoons along the coast in river mouths and pools, especially in warmer water. The range of distribution is from Cuidad del Carmen in Southeast Mexico to the vicinity of Belize City in Belize. All around the coast of Yucatan.

It is a species that lives schools in lagoons and mangrove swamps and this fish loves a little brackish or salty water. Bottom is mostly sandy on the places they occur along the coast from the peninsula Yucatan down to Belize. The species is territorial in the breeding season and males fight for their territory which implicates that the species need a certain distance from other pairs during this breeding. Best is to keep it pair wise or as a trio. Lot of hiding places like plants are needed for females so they can hide if male get's to aggressive.

Females look similar to males but are much paler and have few orange spots. The fins are pale to colorless.

It is seldom seen in the tanks of Killi enthusiasts although it is very attractive and a good aquarium fish as well.

Max. size SL 45 - 64 mm.
Dorsal 11-14,
Anal 9-11,
LL scale count 21-24
Pre- dorsal length to % SL – 0 %
Depth to % SL – 0 %

Hubbs, C.L. 1936. Fishes of the Yucatan peninsula. Publication of the Carnegie Institute of Wachington 457: 214-216, plate 3, figure 1-3

Hubbs, C.L. 1936. Fishes of the Yucatan peninsula. Publication of the Carnegie Institute of Wachington 457: 216-218, plate 4, figure 1-8