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Xenomystus nigri
 

Xenomystus nigri

The African knifefish is distinguishable from N. chitala by the absence of a dorsal fin, but resembles it in being a twilight species. Occasionally it emits a groan-like sound from the pneumatic duct, which links the swim bladder to the digestive tube. Size: 10-20 cm

Xenomystus nigri

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ЯРХО Аркадий Исаакович (1903-35) , российский антрополог. Основные труды по проблемам расоведения и морфологии человека.