Cetopsis
| Cetopsis | |
|---|---|
 |
|
| Cetopsis plumbea | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Siluriformes |
| Family: | Cetopsidae |
| Subfamily: | Cetopsinae |
| Genus: |
Cetopsis Agassiz, 1829 |
| Type species | |
|
Silurus coecutiens Lichtenstein, 1819 |
|
| Species | |
|
See text. |
|
| Synonyms | |
|
|
See text.
Cetopsis is a genus of catfishes (order Siluriformes) of the family Cetopsidae.
Cetopsis is one of four genera in the subfamily Cetopsinae within the family Cetopsidae.Cetopsis is greatly expanded from when it only included C. coecutiens. A number of genera were synonymized with Cetopsis to retain monophyly of cetopsine genera without erecting many new ones.
Information on some species is limited due to lack of specimens. C. caiapo, C. jurubidae, C. sarcodes, and C. umbrosa are only known from a single specimen each, C. starnesi is only known from two specimens, C. parma is only known from four, and C. sandrae from only six specimens.
Cetopsis species are found in major freshwater rivers draining to the east and west of South America, including the Amazon, Atrato, Madeira, Magdalena, Orinoco, , and other rivers in Bolivia, Brazil, Colombia, Ecuador, Peru, and Venezuela.
Cetopsis is distinguished from the other genera in the Cetopsinae from the combination of the absence of a spinelet associated with the dorsal fin, the absence of spines on the dorsal and pectoral fins, and the possession of a single row of teeth on the vomer.
Like most other members of the subfamily Cetopsinae, mature males in most species have the distal ends of the first rays of the dorsal and pectoral fins elongated into filaments and a convex (vs. straight) margin to the anal fin. Unlike all other species, in C. coecutiens, the fin ray filaments are present in both sexes and this species must be differentiated by the anal fin. In C. oliveirai, the fin ray filaments are much longer than in other species, however there is also no difference between the sexes in either the fin ray filament lengths or the anal fin margin. The presence of these traits in mature males cannot be confirmed in C. amphiloxa, C. caiapo, C. jurubidae, C. parma, due to the small number of specimens. The one specimen of C. sarcodes is probably an immature male based on the form of its genital papilla, though it lacks the fin ray elongations and convex anal fin margin of mature males.
...
Wikipedia