Description
Large rostrums, sometimes surpassing 300 mm in lengths and 20-30 mm in diameter. On the external area of the rostrum, muscle insertions can be observed. The phragmocone is short, with clear striae.

Small rostrum with a central, empty hollow where the phragmocone occurred, longitudinal section. Scale bar: 10 mm.

Small rostrum with a phragmocone fragment and initial cell, longitudinal section. Scale bar: 10 mm.

Occurrence
Munteana, Iron Gates Natural Park, in iron oxide rich sandstone, known as the Munteana facies of the Lower Jurassic deposits in the South Carpathians, Sirinia Basin. Munteana includes large accumulations of M. paxillosus.

Stratigraphy
Lower Jurassic.