Triassic Fossil Fish Nodule From Madagascar
Chondrostei; Order Pholidoformes; Family Pholidopleuridae
Time: Lower Triassic (~240 m.y.a.)
is a positive negative specimen nodule from the early Triassic of
Madagascar containing most of a very detailed fish known as Australosomus
is thought to have lain in wait, then shot forward to
catch its prey. It has a free maxilla, something that in later fish
could swing forward as the fish opened its mouth, forming a “slurp
gun” Specimens such as this are rare and few are so complete.
Notice the teeth, delicate fin rays and the regular pattern of the
large scales. This one is missing only the distal portion of the
caudal fin, a fine example of a genus that went extinct during the
middle Triassic. An interesting aspect of these nodules is that
the two haves are not typically part/counterparts, but each retains
the impressions of the opposite sides of the fish.
fossil pictures to enlarge