Fossil
Mall maintains an extensive offering of fish fossils for sale,
including many rare and exotic specimens. Visit
these fossil shops currently stocking
EDCOPE
Enterprises Fish Fossils I EDCOPE
Enterprises Green River Fish Fossils I Pangaea
Fossils
Some
of the finest fossil fish in the world come from the Cretaceous
Lagerstatt in Lebanon. See a broad selection of
these Lebanon
Fossil Fish at EDCOPE Enterprises.
Taxonomy
for Fish Fossils
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Subclass Pteraspidomorphi (early jawless fish)
Class Thelodonti
Class Anaspida
(unranked) Cephalaspidomorphi (early jawless fish)
(unranked) Hyperoartia
Petromyzontidae (lampreys)
Class Galeaspida
Class Pituriaspida
Class Osteostraci (bony armored jawless fis)
Infraphylum Gnathostomata (jawed vertebrates)
Class Placodermi (extinct)
Class Chondrichthyes (cartilaginous fish)
Class Acanthodii (spiny sharks. extinct)
Superclass Osteichthyes (bony fish)
Class Actinopterygii (ray-finned fish)
Class Sarcopterygii (lobe-finned fish)
Subclass Coelacanthimorpha (coelacanths)
Subclass Dipnoi (lungfish)
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Fish
comprise a paraphyletic group taxa (containing taxa that are
descended from a common ancestor, but not including all taxa
descended from the common ancestor), including hagfishes, lampreys,
sharks and rays, ray-finned fishes, coelacanths, and lungfishes.
More formally, fishes are any non-tetrapod chordates. One widely
accepted taxonomy is shown to the right, and some brief descriptions
are given below for major groups from which fossils are known.
The
Agnatha are the jawless fish, and the extant
varieties are the last survivors of the world's first vertebrate
animals. The jawless fish diverged from other fish during the
Cambrian some 500 million years ago, and lack scales, paired
fins, and jaws. They instead have a circular toothed outgrowth
used to latch on to the side of another fish in order to feed
on its
blood.
Agnatha were prominent among primitive fishes of the early Paleozoic.
Haikouichthys and Myllokunmingia are notable agnathans from
the Chengjiang biota of China. Another putative agnathid from
Chengjiang is Haikouella. The Agnatha larvae are filter feeders,
a characteristic that betrays their evolutionary kinship with
invertebrate chordates. Many Ordovician, Silurian, and Devonian
agnathans were heavily armored with bony, spiked plates. The
Ostracoderms were the first armored agnathans, ancesctors of
the bony fish and thus to tetrapods, including humans, beings)
that are are known from the middle Ordovician. Agnathans never
recovered from a decline during the Devonian.
The
Chondrichthyes are the cartilaginous fish having
flexible skeleton of cartilage rather than bone. They evolved
some 100 million years after the jawless fish and the sharks,
skates, and rays. They have jaws, teeth and scales, and are,
in general, effective predators. The teeth of carnivorous sharks
are not attached to the jaw, but instead are embedded in the
flesh. Shark teeth of many species are constantly replaced and
some sharks can lose 30,000 teeth over their lifetime, which
is why shark teeth fossils are so abundant. In contrast, cartilagage
poorly fossilizes, making the cartilaginous fish fossils relatively
uncommon.
The
Osteichthyes are the bony fish that evolved
in conjunction with the cartilaginous fish that are by far the
largest group of fishes, have paired fins, dermal scales, numerous
vertebrae, and often many teeth. The bony fish (Osteichthyes)
can, in turn, be divided into two categories, the lobe-finned
fish and the ray-finned fish. Lobe-finned fish have muscular
fins supported by bones. The lone surviving lobe-finned fish
is the coelacanth. Science believes that terrestrial animals
evolved from lobe-finned, rather than ray-finned fish. Ray-finned
fish comprise all other fish with a flexible skeleton made of
bone. Osteichthyes are the largest group of vertebrates comprising
some 29,000 extand species.