The most primitive form of the first type of dermal structures is that of the placoid scales of Elasmobranchii.
That is what they call the dermal nitrate test, I believe is the correct name that they give it.
The skeleton of these great fins is almost entirely composed of dermal bone.
A bloated toad, studded with dermal excrescences, was boasting that she was the wartiest creature alive.
The completeness or incompleteness of the occiput and the location and extent of its attachment to the dermal roof.
dermal osseous plates may be formed in connection with these scales, but are never of course united with the superficial cuticle.
But attention to a dermal stimulation is precisely the condition which would tend to some extent to prevent this inhibition.
dermal scutes are best represented in Acipenser and some Siluroid Fishes.
These two conditions result from the inability of the dermal bones to fill at the proper period the gaps in the chondrocranium.
In certain Fishes the cartilaginous cranium remains quite unossified, while completely enveloped in dermal bones.
dermal der·mal (dûr'məl) or der·mic (-mĭk)
Of or relating to the skin or dermis.