|The fine structure of a camaroid graptolite
ADAM URBANEK & PIOTR MIERZEJEWSKI
Lethaia 1991, 24, 2, 129-137
|The Tremadoc camaroid graptolite (Camaroidea) Tubicamara coriacea Kozlowski, isolated from chert nodules, has
been studied using the SEM, LM and TEM techniques. The ectocortex is composed of fibrous fabric, being the
sole building material of its supermost and lowermost portions, as well as block of characteristic homegenous
material. The latter abounds in the middle portion, where it produces a few layers separated by the fibrous
tissue. The preservational corrosion of the upper portion is responsible for the exposure of these blocks seen on
the eroded surfaces in the form of characterictic proturberances and tubercles. Such a rough and seemingly
sculptured surface is thus secondary, resulting from partial periderm destruction. The origin of condensations of
homegenous material within the cortical tissue is discussed in comparison with earlier findings and a description
of other ultrastructural features of the studied camaroid is given.
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