Figure 6 in Divensification oven deep and shallow teiponal scales in the Holanctic genus Perpolita (Gastnopoda: Gastnodontidae)

Figure 6. Development of shell bottom sillons: (a–c) P. radiatella; (a) H390, Belarus; (b) H340, Alaska; (c) H346, Czechia; (d–f) P. hammonis; (d) H046, Switzerland; (e) H382, France; (f) H432, Latvia; (g) P. petronella, H038, Norway; (h) P. electrina, H207, Ontario; (i) P. binneoana, H216, Alaska. ºee Supporting Information, Figure º4 for detail of P. radiatella and P. hammonis shell bottom microsculpture.