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Asterozoan pedicellariae and ossicles revealed from the Middle Ordovician of Baltica

100%

Tinn O., Ainsaar L.

Acta Palaeontologica Polonica

2014

tom 59

nr 2

Isolated asterozoan ossicles and pedicellariae occur in micropalaeontological samples from the Darriwilian (Middle Ordovician) of the Mishina Gora section, north-western Russia. The well-preserved Bursulella unicornis type fossils represent the oldest hitherto record of asterozoan pedicellariae. The accompanying ossicles are not diagnostic but allow their tentative placement within the asteroid stem group. The abundance of disarticulated ossicles in the samples proves that asterozoans were not as rare as they have been considered and were important members of Ordovician ecosystems in the Baltic Palaeobasin.

An enigmatic early ? palaeocope ostracode from the Arenig of NW Russia

100%

Tinn O., Meidla T.

Acta Palaeontologica Polonica

2002

tom 47

nr 4

The ostracode Lavachilina evae gen. et sp. nov. is described from the Arenig of Western Russia. Its carapace possesses a unique discontinuous velum, developed at both ends as a narrow spinose ridge. The systematic position of L. evae is uncertain. Its character set shows mostly palaeocope affinities but also some features of leiocopes. L. evae is tentatively assigned to the palaeocope family Oepikellidae, possibly representing an early member of that family. Although L. evae existed contemporaneously with palaeocopes such as Laccochilina, it does not appear to be closely related to these early eurychilinoids.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

2 Tinn O.

1 Ainsaar L.

1 Meidla T.

1 2014

1 2002

Wyniki wyszukiwania

Asterozoan pedicellariae and ossicles revealed from the Middle Ordovician of Baltica

An enigmatic early ? palaeocope ostracode from the Arenig of NW Russia