This plate offers an opportunity to own an example of a fine predatory
Nematonotus fish. As they mature, Nematonotus develop a dramatic
flag-like dorsal fin extension, hence the generic name longispinus.
The dorsal here certainly lives up to that name, demonstrating this
is an adult example. The genus became extinct during the Cretaceous.
The detail in the caudal fin is remarkable; notice too the fine
detail to the vertebral column. There are several partial shrimp
of the genus Carpopenaeus present as well, with another on the reverse.
a member of Infraclass
Teleostei (one of the three infraclasses in class Actinopterygii),
it is a ray-finned fish. The Teleostei comprises a diverse group
that arose in the Triassic period, and has some 20,000 extant species
in some 40 orders. By the end of the Cretaceous, teleost fish had
come to dominant thre fishes in both marine and freshwater environments.
The remaining two infraclasses of Class Actinopterygii, Holostei
and Chondrostei, are paraphyletic.
fossil site near Hajoula, Lebanon
where this fish came from is a remarkable Lagerstatt yielding an
enormous diversity of exquisitely preserved fossils. The fishes
are most notable, but invertebrates are also well represented.