People / Stefan Polkowsky
from his collection ![]() Quadrinervus wienekei Schnetler & Nielsen, 2018; Kerteminde marl, Selandian, Paleogene; steep coast near Noer, Schleswig-Holstein, Germany; 24 mm; Coll. Stefan Polkowsky drawing ![]() Aporrhais speciosa; drawing by Stefan Pokolsky |