... com/forum/search.php?keywords=Heteropneustes+&fid%5B0%5D=14 => paper not found
https://www.planetcatfish.com/forum/search.php?keywords=triostegus+&fid%5B0%5D=14 => paper not found
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Histological study of maxillary barbels in Silurus triostegus and Heteropneustes fossilis (SILURIFORMES ...

... Actinopterygii: Siluriformes: Siluridae) from the southern marshes of Iraq, with a new anatomical set of characters to separate S. glanis and S. triostegus. Integrative Systematics: Stuttgart Contributions to Natural History, 3 (1), 85-100.

Abstract
Investigations conducted in the southern Iraq ...

... basin; the family Siluridae with one genus and two species, Silurus glanis in the Caspian Sea, Lake Orumiyeh and Hari River basins and Silurus triostegus in the Tigris River basin; and the family Sisoridae with one genus and two species, Glyptothorax kurdistanicus in the Tigris River basin and ...