The external skeleton of " Bothriolepis canadensis " is made of cellular dermal bone tissue and is characterized by distinct horizontal zonation or stratification.
12.
As such the carapace is made up of 8 pleurals on each side, these are a combination of the ribs and fused dermal bone.
13.
The dermal bones of arandaspids consist of aspidine ( acellular bone ) and are ornamented with oakleaf-shaped tubercles which seem to contain no dentine.
14.
The calcium and magnesium in the dermal bone will release alkaline ions into the bloodstream, acting as a buffer against acidification of the body fluid.
15.
Many had hypocercal tails in order to generate lift to increase ease of movement through the water for their armoured bodies, which were covered in dermal bone.
16.
The armour is formed by plates of dermal bone covered in relatively small, overlapping epidermal scales called " scutes ", composed of bone with a covering of horn.
17.
The function of some dermal bone is conserved throughout vertebrates, although there is variation in shape and in the number of bones in the skull roof and postcranial structures.
18.
Another classical problem is which one of two pairs of large dermal bones in the skull roof of sarcopterygian fishes that is homologous to the parietal bone of tetrapods.
19.
The bone of the shell consists of both skeletal and dermal bone, showing that the complete enclosure of the shell probably evolved by including dermal armor into the rib cage.
20.
Cladists classify land vertebrates based on the presence of an neither in the cover of dermal bone that formerly covered the temporalis muscle, whose origin is the temple and whose insertion is the jaw.
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