| Nature of Graptovermids (Graptolithina) Piotr Mierzejewski Acta Palaeontologica Polonica 33, 3, 267-272 |
| Abstract, p. 267: Graptovermids are redefined as resting terminal portions of unknown encrusting graptolites stolothecae. Presumably, their biological significance was an adaptation allowing to survive the periods of unfavourable or adverse conditions. SEM observations are made on Graptovermis intestinalis Kozlowski, 1949 from the lower Ordovician of Öland (Sweden). |
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| Graptovermis intestinalis Kozlowski, 1949, upper Tremadoc, Poland (from Kozlowski) |
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