|New placognath Eunicida (Polychaeta) from the Ordovician and
Silurian of Poland
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.
|[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
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 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.
Piotr Mierzejewski, the Count of Calmont and Countess Maja Anna Korwin-Kossakowska