belemnite: a conical calcareous fossil tapering to a point at one end and with a conical cavity at the other end containing (when unbroken) a small chambered phragmocone from the shell of any of numerous extinct cephalopods of the family Belemnitidae
fossil: the remains (or an impression) of a plant or animal that existed in a past geological age and that has been excavated from the soil
laricariidae: armored catfish