| Gieysztoria | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Platyhelminthes |
| Order: | Rhabdocoela |
| Family: | Dalyelliidae |
| Genus: | Gieysztoria Ruebush & Hayes, 1939 |
Gieysztoria is a genus of Platyhelminthes belonging to the family Dalyelliidae, and within this family it is the genus with the highest numbers of species (approximately 75 species) and the widest distribution. [1]
The genus has cosmopolitan distribution, [2] and mainly inhabits freshwaters.
Source: [3]
Within the Neotropical region, Gieysztoria is the most specious genus, with 24 described species. [4] These taxa exhibit differences in male stylet morphology compared to their European counterparts, with Neotropical species showing greater structural complexity. [4] Other genera in this region are poorly represented: Dalyellia (one species), Microdalyellia (three species), and Sergia (one species). [4]
In Argentina, seven species of Gieysztoria have been recorded: G. santafeensis, G. quadrata, G. coronae, G. tigrensis, G. pseudodiadema, G. variata, and G. falx. [4] Additionally, a single species of Microdalyellia (M. fairchildi) and one species of Dalyellia (D. obscura) are known. [4]