Fig. 10

A comparison of three exemplars from among the eight Richtersius species genetically delimited in the present study. Shown are PCM photomicrographs of morphological traits which could be useful in their differentiation. a–c Cuticular pore morphology. d–f External lunule III morphology. g–i Posterior lunule morphology. j–l Claws III (internal, external and internal, respectively). m–o Morphology of the buccal tube walls around the level of the stylet insertion point. The first column presents Richtersius coronifer s.s. (NO.385) from the Billefjorden population, the second and third columns show Richtersius sp. from Italy (IT.120) and Greece (GR.008), respectively. Scale bars in μm