There is a species of Polypterus, and it is probable that the Protopterus or lung fish is also found there, though its existence has not as yet been established by a specimen.
Smith Woodward has observed that the decline of many groups of fishes is heralded by the tendency to assume elongate and finally eel-shaped forms, as seen independently, for example, among the declining Acanthodians or palaeozoic sharks, among the modern crossopterygian Polypterus and Calamoichthys of the Nile, in the modern dipneustan Lepidosiren and Protopterus, in the Triassic chondrostean Belonorhynchus, as well as in the bow-fin (A7nia) and the garpike (Lepidosteus).
A somewhat rare fish is the Polypterus, which has thick bony scales and 16 to 18 long dorsal fins.
Pollard, "On the Anatomy and Phylogenetic Position of Polypterus," Zool.
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