The Placoderms ("plate skin") are a class of extinct jawed vertebrates which are - by those few laypeople who've heard of them - dismissed as being a bunch of sluggish has-beens which were somehow easily outcompeted by primitive sharks and primitive bony fish. That is, except when people talk about the "first vertebrate superpredator," the bus-sized Dunkleosteus, which is popularly imagined as being akin to a swimming dumptruck of death that munched on primitive sharks like fishy carrot sticks. They are also known as "Panzer fish" in most German-speaking countries, but only a very few had body patterns that included the Iron Cross (most had patterns that formed concentric rings, "measles," or a wood-grained texture).
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| - The Placoderms ("plate skin") are a class of extinct jawed vertebrates which are - by those few laypeople who've heard of them - dismissed as being a bunch of sluggish has-beens which were somehow easily outcompeted by primitive sharks and primitive bony fish. That is, except when people talk about the "first vertebrate superpredator," the bus-sized Dunkleosteus, which is popularly imagined as being akin to a swimming dumptruck of death that munched on primitive sharks like fishy carrot sticks. They are also known as "Panzer fish" in most German-speaking countries, but only a very few had body patterns that included the Iron Cross (most had patterns that formed concentric rings, "measles," or a wood-grained texture).
- The Placodermi were a class of armored prehistoric fish, known from fossils, which lived from the late Silurian to the end of the Devonian Period. Their head and thorax were covered by articulated armoured plates and the rest of the body was scaled or naked, depending on the species. Placoderms were among the first jawed fishes; their jaws likely evolved from the first of their gill arches. A 380 million year old fossil of one species represents the oldest-known example of live birth.
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| - *Antiarchi
*Arthrodira
*Brindabellaspida
*Petalichthyida
*Phyllolepida
*Ptyctodontida
*Rhenanida
*Acanthothoraci
*?Pseudopetalichthyida
*?Stensioellida
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| - Dunkleosteus Skull at Sam Noble Museum
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| - Image:DunkleosteusSannoble.JPG
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| - The Placodermi were a class of armored prehistoric fish, known from fossils, which lived from the late Silurian to the end of the Devonian Period. Their head and thorax were covered by articulated armoured plates and the rest of the body was scaled or naked, depending on the species. Placoderms were among the first jawed fishes; their jaws likely evolved from the first of their gill arches. A 380 million year old fossil of one species represents the oldest-known example of live birth. The first identifiable Placoderms evolved in the late Silurian; they began a dramatic decline during the Late Devonian extinctions, and the class was entirely extinct by the end of the Devonian.
- The Placoderms ("plate skin") are a class of extinct jawed vertebrates which are - by those few laypeople who've heard of them - dismissed as being a bunch of sluggish has-beens which were somehow easily outcompeted by primitive sharks and primitive bony fish. That is, except when people talk about the "first vertebrate superpredator," the bus-sized Dunkleosteus, which is popularly imagined as being akin to a swimming dumptruck of death that munched on primitive sharks like fishy carrot sticks. They are also known as "Panzer fish" in most German-speaking countries, but only a very few had body patterns that included the Iron Cross (most had patterns that formed concentric rings, "measles," or a wood-grained texture).
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