Hemisorubim
| Porthole shovelnose catfish | |
|---|---|
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Siluriformes |
| Family: | Pimelodidae |
| Genus: |
Hemisorubim Bleeker, 1862 |
| Species: | H. platyrhynchos |
| Binomial name | |
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Hemisorubim platyrhynchos (Valenciennes, 1840) |
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| Synonyms | |
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Platystoma platyrhynchos |
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Platystoma platyrhynchos
Valenciennes, 1840
The porthole shovelnose catfish or spotted shovelnose catfish, Hemisorubim platyrhynchos, is the only species in the genus Hemisorubim of the catfish (order Siluriformes) family Pimelodidae.
This fish is considered one of the "sorubimine" catfishes, an informal group of catfish that includes genera such as Sorubim, Pseudoplatystoma, and Brachyplatystoma. This genus forms a monophyletic group with Sorubim, Sorubimichthys, Pseudoplatystoma, and Zungaro. Of these genera, Hemisorubim is most closely related to Pseudoplatystoma.
This species is native to South America and originates from the Amazon, Maroni, Orinoco, and Paraná River basins. It also occurs in the Pantanal.
This fish reaches a length of 52.5 centimetres (20.7 in) SL and weighs up to 1,470 grams (3.23 lb). It is the sixth largest Pimelodid in the Pantanal. Its body shape and color pattern are perfectly adapted to the muddy bottom where they inhabit. These fish have a relatively slow growth rate, except during the first year of life when growth is rapid.
This species is rather rare, confined to the deeper and slow-moving parts of large rivers together with some Loricaria and Potamotrygon. The position of the eyes and the shape of the mouth of this piscivorous fish indicate its stalking mode of hunting; these fish feed on benthic organisms and other fish. During the receding period, these fish migrate and leave the flooded areas and return to the river channel.
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