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A new Y-shaped trace fossil attributed to upogebiid crustaceans from Early Pleistocene of Italy

100%

Pervesler P., Uchman A.

Acta Palaeontologica Polonica

2009

tom 54

nr 1

135-142

Y−shaped trace fossil (U−shaped upper part with a basal shaft), Parmaichnus stironensis igen. nov. et isp. nov. penetrates from a discontinuity surface cut in Early Quaternary mudstones in the Stirone Valley, Northern Italy. It is attributed to upogebiid decapod crustaceans. Parmaichnus differs from Psilonichnus by the presence of turning chambers in the upper part of the burrow. The turning chambers are considered to be an important taxonomic feature of upogebiid burrows. P. stironensis occurs together with Thalassinoides cf. paradoxicus (produced probably by callianassid crustaceans) and wide U−shaped pyritised cylinders (supposedly produced by balanoglossid hemichordates).

Echinoid burrow Bichordites monastiriensis from the Oligocene of NE Italy

80%

Bernardi M., Boschele S., Ferretti P., Avanzini M.

Acta Palaeontologica Polonica

2010

tom 55

nr 3

479-486

Several specimens of trace fossil Bichordites monastiriensis were discovered in two shallow water Oligocene sandstone beds from Valsugana (Trentino, NE Italy) representing the oldest documented occurrence for this ichnospecies. They are grazing−crawling (pascichnion−repichnion) structures and are occasionally associated with enlarged structures that can be interpreted as resting traces (cubichnia) and assigned to the ichnogenus Cardioichnus. The resulting Bichordites–Cardioichnus compound trace fossil is here described for the first time. In the basal part of some specimens, skeletal remains of Eupatagus ornatus were found in life position. This founding enables to widen the spectrum of known Bichordites tracemakers. Exceptional conditions of preservation of one specimen extending in two beds recording different environmental conditions gave an opportunity to document the effects of various taphonomical histories on the preservation of this traces.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

1 Avanzini M.

1 Bernardi M.

1 Boschele S.

1 Ferretti P.

1 Pervesler P.

1 Uchman A.

1 2010

1 2009

Wyniki wyszukiwania

A new Y-shaped trace fossil attributed to upogebiid crustaceans from Early Pleistocene of Italy

Echinoid burrow Bichordites monastiriensis from the Oligocene of NE Italy