Figure 4 from: Oliva A (2012) A new species of Oxelytrum Gistel (Coleoptera, Silphidae) from southern Argentina, with a key to the species of the genus. ZooKeys 203: 1-14. https://doi.org/10.3897/zookeys.203.2837

Figure 4 - Oxelytrum selknan and Oxelytrum biguttatum, male genitalia with extruded internal sac. A Oxelytrum selknan, male genitalia in dorsal aspect, showing sac with brown microtrichia on apical portion and small rounded lobes proximal to the latter (arrows). Scale bar= 1 mm. B Idem, lateral aspect. Scale bar= 1 mm. C Idem, detail of internal sac, showing small lobes (arrows) and large basal lobe partially extruded. Scale bar= 1 mm. D Idem, ventral aspect, showing lighter coloring of apical portion and extruded small lobes (arrows). Scale bar= 0.5 mm. E Oxelytrum biguttatum, male genitalia in dorsal aspect, showing apical portion without apparent microtrichia, absence of small median lobes, and large basal lobes fully extruded. Scale bar= 1 mm. F Idem, lateral aspect. Scale bar= 1 mm