A probable cephalopod eggs as epibionts on Mastigograptus
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Clistrocystis graptolithofilius, known from
Ordovician glacial boulders from Poland, was
described by R. Kozłowski (1959) as an
enigmatic organic fossil. These distinctive
forms were epibionts on Mastigograptus
colonies.
Later, R. Kozłowski (1965) reinterpreted
Clistrocystis as probable cephalopod egg
capsules, laid down on graptolite stipes.
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A. Ordovician Clistrocystis graptolithofilius
on Mastigograptus stipe.
B. Egg capsules of Recent Sepia officinalis
on the seagrass Zostera.
Based on:
Kozłowski, R. 1959. Un microfossile enigmatique. - Acta Palaeontologica Polonica 4, 273-277.
Kozłowski, R. 1965. Oeufs fossiles des Cephalopodes? - Acta Palaeontologica Polonica 10, 3-9.