DEVONIAN TENTACULITOIDEA OF PONTA GROSSA FORMATION, PARANA BASIN: DESCRIPTION AND SOME TAPHONOMIC ASPECTS

Tentaculitoidea is an extinct invertebrate group, being recorded from Ordovician to Devonian. The group is identified by a small conical shell, millimetric sized, opened at one of the extremities and composed by calcium carbonate. The aim of this research is to identify Tentaculitoidea molluscs deposited in the collection of the Paleontology Laboratory, Sector of Earth Sciences, at Universidade Federal do Parana, and also contribute to increase of knowledge concerning this fossil group. Most representative specimens were selected from 317 rock samples containing 1882 specimens. The samples came from the Ponta Grossa Formation (Early Devonian-Late Devonian), more specifically from the members Jaguariaiva and Sao Domingos. There were identified five genera, as Homoctenus, Seretites jaculus, Styliolina, Tentaculites and Uniconus It was possible to conclude that, in the LabPaleo, the predominant genus is Homoctenus, and Jaguariaiva Member contains more samples with tentaculitoid than Sao Domingos Member, although this fact can be attributed to the sampling bias. Unfortunately, due to the poor preservation of shell, many specimens could not be identified.