Studies on graptolites 1. Development and structure of Pristiograptus gotlandicus (Perner)
Adam Urbanek
Acta Palaeontologica Polonica 04 (1), 1959: 11-26
This paper describes the astogeny and structure of Pristiograptus gotlandicus (Perner), etched from Silurian erratic boulders. This species differs from typical pristiograptids in certain characters of the thecal aperture whose morphological significance is discussed.
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