Acta Palaeontologica Polonica

A new graptolite, intermediate between the Tuboidea and the Camaroidea

Piotr Mierzejewski

Acta Palaeontologica Polonica 46 (3), 2001: 367-376

A new tuboid graptolite, Camarotubus graptocamaraeformis gen. et sp.n., is described from a calcareous erratic boulder of middle Ordovician (Caradoc?) age from Poland. This encrusting form combines characters of both the tuboid and the camaroid graptolites, and is regarded as a purely morphological intermediate between them. This finding supports Kozłowski's (1949) concept of a close phylogenetic relationship between the orders Tuboidea and Camaroidea.

Key words: Graptolithina, Camaroidea, Tuboidea, evolution, Ordovician, erratic boulders, Poland.

Piotr Mierzejewski [], Instytut Paleobiologii PAN, ul. Twarda 51/55, PL-00-818 Warszawa, Poland. Present address: ul. Filtrowa 83 m. 49, PL-02-032 Warszawa, Poland.

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