| Key to species of Otothyropsis |
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| Calegari, B.B., P. Lehmann A. and R.E. Reis 2013. Two new species of cascudinhos of the genus Otothyropsis (Siluriformes: Hypoptopomatinae) from the rio Paraná basin, Brazil. Zootaxa 3619(2):130-144. Ref No [93039] Key No. [36] |