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Petalichthyida - Generalised Placoderms


The , of China.


Petalichthyida
Linnaean Hierarchy Local Cladogram

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: Macropetalichthyidae

|--
|  `== (paraphyletic)
|     |------
|     |  |  `--
|     |  `----
|     |     `--
|     `----
|        |----
|        |  `--viagra prices uk
|        |     |--Macropetalichthyidae
|        |     `--Quasipetalichthyida
|        `--
`--

Stratigraphic Range:


The Petalichthyida was an order of small, flattened . They were typified by their splayed fins, and numerous tubercles that decorated all of the plates and scales of their armor. They reached a peak in diversity during the Early and were found throughout the world, particularly in Europe (especially in Germany), North America, Asia, South America, and Australia. The petalichthids Lunaspis and Wijdeaspis are among the best known. There was an independant diversification event that occured in what is now Southern China, producing a handful of unique that were once placed in their own order, "Quasipetalichthyida," named after the first discovered (and described) species there, . Soon after the Petalichthids' diversification, they went into a decline, until the last few were exterminated along with the rest of the placoderms during the Late Devonian event.

Some experts view the differences between the quasipetalichthyids and the petalichthyids proper in the joint articulation of the skull and thoracic plates to be proof that Petalichthyida is paraphyletic, and that the skull to thorax articulation of quasipetalichthyids is actually more similar to . However, this hypothesis is not widely accepted, as there needs to be more studies done on fossil specimens.

From what can be garnered from their compressed body forms, it is presumed that the Petalichthyids were bottom-dwellers that either chased after, swam after, or ambushed smaller fish. However, their diet is highly speculatory, as none of the fossil specimens found have the mouth or mouth parts preserved.

The armor of the Petalichthyids are very distinctive, being decorated by a series of grooved "finger-print" patterns on the outer surface of the plates, very smiliar to the patterns of the . It is strongly suspected that the grooves either held nerves, or created extra surface area for motion- and or electrochemically sensitive organs in the skin.


Characters: Like primitive Arthrodira. Strict benthonic: compressed (narrow bodied) with dorsal orbits (upward-facing eyes). No post-pectoral plates. common. ATW




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-- 21:06, 24 September 2006 (PDT)

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