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| New placognath Eunicida (Polychaeta) from the Ordovician and Silurian of Poland Piotr Mierzejewski Acta Geologica Polonica 1978, 28, 2, 273-281 |
| Eunicida with placognath jaw apparatuses make an extinct group of Polychaeta known since the Ordovician through Permian. Some doubtful placognath eunicids were also reported from the Triassic. Isolated jaws were fot the first time described by Hinde (1879) but they were erronously assigned to the Staurocephalidae. Their taxonomic position has been recognized by Kielan-Jaworowska (1961, 1962, 1966) who described well-preserved jaw apparatuses from the Ordovician and Silurian of Poland. |
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| [ABSTRACT, p. 273] Four species of placognath Eunicida (Polychaeta) represented by isolated jaws and jaw apparatuses are described from Ordovician and Silurian erratic boulders collected along the Baltic coast in Poland. One new genus (Rakvereprion gen. n.) and two new species (Mochtyella angelini sp.n., and M. grazynae sp.n) are erected. |
| PLATE 1 Abbreviations: At anterior tooth, br basal ridge, Lt lateral tooth, MIl left maxilla, MIr right maxilla, sr second ridge, sr' second ridge of secondary maxilla, sMIr seconadary MIr. |
| Mochtyella angelini Mierzejewski, 1978 Ludlovian erratic boulder No. MZ/142. 1a-b Holotype, jaw apparatus in two views. 2a-c Right MI in left lateral, dorsal, and right lateral views. 3a-c Left MI in left lateral, dorsal, and right lateral views. |
| Mochtyella grazynae Mierzejewski, 1978 Ludlovian erratic boulder No. MZ/142. 4a-c Holotype, right MI in left lateral, dorsal, and right lateral views. 5a-c Left MI in right lateral, dorsal, and left lateral views. |
| PLATE 2 1 Vistulella kozlowskii Kielan Jaworowska, 1961; Upper Ordovician erratic boulder No. MZ/25 2. Rakvereprion balticus (Eisenack, 1975); Upper Ordovician erratic boulder No. MZ/25. |
| Fig. 1. Diagrammatic sketch of jaw apparatus of Vistulella kozlowskii. |
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| Edited by Piotr Mierzejewski, the Count of Calmont and Countess Maja Anna Korwin-Kossakowska 2002-2004 |
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