The Biology of the African Bonytongue Heterotis niloticus (Cuvier, 1829) from the Lower Niger River at Agenebode in Edo State, Nigeria

Figure 8

Histology of the gastrointestinal tract of H. niloticus: (a) oesophagus; (b) stomach; (c) pyloric ceca; (d) small intestine; (e) large intestine; (f) cloaca. gg, gastric gland; sm, submucosa; gp, gastric pits; lp, lamina propria; mc, mucus cells; cmf, circular muscle fibre; lmf, longitudinal muscle fibre.