A b s t r a c t
A representative of the order Dendroidea, described as Graptolodendrum mutabile n.gen., n.sp., differs from other dendroid graptolites in its bithecae whose position is not stabilized. Mostly, they occur on one side of the stipe and, rarely, on both sides alternatively which is a rule in the Dendroidea. The fusellar structure of autothecae, mostly irregular in the distal parts, is also unstabilized. The position of the pore which pierces the wall of metasicula, as in the Graptoloidea, and not of prosicula, is a fully exceptional character in the representative of the Dendroidea. The material investigated has been etched out from the Middle Ordovician erratic boulders of Poland.
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