Fig. 4
From: First possible evidence of parasite infestation in Upper Devonian Discosorida (Nautiloidea)
Comparison of two Cyclopoceras abundans specimens from the same locality and layer—normal and with a pit, both in ventral view, with their schematic drawing. a Specimen No MSU EF 13877, b specimen No MSU EF 13876. Scale bars are 1 cm