| Pterobranchites Kozlowski, 1967 |
| Class Graptolithoidea, Ordo Cephalodiscoidea, Family uncertain |
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| References: Kozlowski, R. 1967. Sur certain fossiles ordoviciens a test organique. - Acta Palaeontologica Polonica 12, 2, 99-132. Mierzejewski, P. 1984. Pterobranchites Kozlowski, 1967 - an aberrant graptolite? - Acta Palaeontologica Polonica 20, 1/2, 83-89. |
| Diagnosis. - "Colonie composée de tubes et vésicules de différent calibre, irrégulierement réunis entre eux, et de theques vésiculeuses étirées en tube cylindrique. Tours les éléments ont la structure fusellaire et sont recouverts d'une commune couche corticale." From Kozlowski 1967, p. 123. |
| Occurence. - Ordovician (Llandeilo) of Poland. Known only from the type locality (deep boring Krzyze 4, depth 473 m). |
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| Pterobranchites antiquus Kozlowski, 1967. Tiny fragments, presumably from the single colony. Llandeilo, deep boring Krzyze 4, depth 473m. From Kozlowski, 1967. |
| Remarks. - Pterobranchites has been assigned by Bulman (1970) to the living family Cephalodiscidae. The data on ultrastructure of periderm raise some doubts with reference to affiliation of that form to cephalodiscids (Mierzejewski 1984). Periderm of Pterobranchites markedly differs in structure from that of modern cephalodiscids in number of layers and character of material. |
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