Actually....the caudal fin on Polycentropsis abbreviata is every bit as big as it is on most other fish. The reason it looks so small is that, like the pectoral fins, the caudal fin on these fish is transparent.
Nandids, of which this African Leaf Fish is one, are a group of fish that are found in Asia, Africa and South America. The Asian fish mostly belong to the genus Nandus and include Nandus nandus and Nandus nebulosus, among others. The African representatives include the fish that Toirtis has (Polycentropsis abbreviata) and the Four-spine African Leaf Fish (Afronandus sheljuzhkoi). South American representatives include the South American Leaf Fish (Monocirrhus polyacanthus) and Schomburgk's Leaf Fish (Polycentrus schomburgki). They are all decidedly predatory, eating primarily fish and aquatic insects. All of them share the characteristic of transparent tail and pectoral fins which makes it easier for them to sneak up on their prey because the fins that are moving are basically invisible.
NICE pick up, Toirtis. I'll be interested to see if you can get them to take anything but live food!
Aquarist since 1964