Pygidianops
| Pygidianops | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Siluriformes |
| Family: | Trichomycteridae |
| Subfamily: | Glanapteryginae |
| Genus: | Pygidianops Myers, 1944 |
| Type species | |
| Pygidianops eigenmanni Myers, 1944
| |
Pygidianops is a
Species
There are currently four recognized species in this genus:[1]
- Pygidianops amphioxus de Pinna & Kirovsky, 2011
- Pygidianops cuao Schaefer, Provenzano, de Pinna & Baskin, 2005
- Pygidianops eigenmanni Myers, 1944
- Pygidianops magoi Schaefer, Provenzano, de Pinna & Baskin, 2005
Distribution
P. eigenmanni is from the Rio Negro basin in Brazil.[2] P. cuao is known only from Cuao River drainage basin. P. magoi is known only from lower Orinoco mainstem between Ciudad Bolívar and Barrancas in Venezuela.[3]
Description
Species of Pygidianops share the extreme reduction of pigmentation, loss of the
P. cuao is distinguished from congeners by the presence of diminutive eyes (vs. eyes absent in both other species), posterior naris absent (vs. nares bilaterally paired), and the presence of a triangular skin flap at mouth corner (vs. skin flap absent).[3] P. magoi is distinguished from all congeners by the absence of pectoral and anal fins (vs. fins present), posterior naris absent (vs. present, nares bilaterally paired), four laterosensory pores on the head (vs. six), and by the presence of 9–10 caudal fin rays (vs. 12–13). With all of its fins lost except the caudal fin, P. magoi represents the most extreme fin loss among ostariophysans.[3] P. eigenmanni lacks eyes but has its anal and pectoral fins.[3]
References
- ^ Froese, Rainer and Pauly, Daniel, eds. (2012). Species of Pygidianops in FishBase. February 2012 version.
- .
- ^ S2CID 19506818.