Isbrueckerichthys
| Isbrueckerichthys | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Siluriformes |
| Family: | Loricariidae |
| Subfamily: | Neoplecostominae |
| Genus: |
Isbrueckerichthys Derijst, 1996 |
| Type species | |
|
Hemipsilichthys duseni A. Miranda Ribeiro, 1907 |
|
Isbrueckerichthys is a genus of armored catfishes native to South America.
Isbrueckerichthys was erected in 1996 for Pareiorhaphis duseni and Pareiorhaphis alipionis, which were transferred to the new genus.I. epakmos was described in 2003.I. calvus and I. saxicola were described in 2006.
There are currently five recognized species in this genus:
Three species of Isbrueckerichthys are thought to be endemic to the Ribeira de Iguape River basin: I. duseni from the upper reaches of that basin in Paraná State, I. alipionis from the Betari River, a tributary of rio Ribeira de Iguape, and I. epakmos from a tributary of the Juquiá River in São Paulo State. Both I. calvus and I. saxicola were collected in headwater streams of Tibagi River of the Paranapanema River basin in Paraná State of Brazil. I. saxicola is only known from the headwater of ribeirão Jacutinga, in low Tibagi River basin. I. calvus is only known from córrego Juruba and ribeirão Água dos Oito, affluents of the Taquara River of the Tibagi River basin.
Isbrueckerichthys is composed of small- to medium-sized species up to 90.2 millimetres (3.55 in) SL. These fish have a dorsal fin with one spine and seven branched rays, and a caudal peduncle ovoid in cross-section.
I. alipionis is the only species in which the teeth of the dentary and premaxilla are without a lateral cusp.I. epakmos is the only species in which mature males have a clump of hypertrophied odontodes only on the anterior portion of snout; in the other species, odontodes are also present on the lateral margins of the head. The most distinctive features of I. epakmos are the anterior portion of head ornamented with a large and soft fleshy area and the presence of a clump of hypertrophied odontodes located only on anterior portion of snout, usually short and thick, directed forward or slightly upward on adult males.I. duseni has a short pectoral fin spine and a long caudal peduncle (over a third of the body length), while the remaining two species, I. calvus and I. saxicola, have long pectoral fin spines and a short caudal peduncle (about a quarter to less than a third of the body length). I saxicola exhibits minute abdominal platelets with much more than six odontodes, a plated area under the first three plates of the lateral line, an exposed portion of cleithrum bordering all the posterior margin of the opercular opening on lateral side of the body, and an exposed surface of supraoccipital flat or slightly convex. On the other hand, I. calvus has minute abdominal platelets with at most six odontodes, a nude area under the first three plates of the lateral line, an unexposed cleithrum, or when exposed, bordering just the superior portion of posterior margin of the opercular opening on lateral side of the body, and an exposed surface of supraoccipital strongly convex, with an area without odontodes at the center.
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