Fig. 4

Morphospace using Burnaby-Back-Projection and its resulting implications: a Morphospace using Burnaby-Size-Correction and PCA, small circles represent included specimens, large circles represent the center calculated for the respective species, ellipses indicate a 75% confidence interval; b Simplified phylogenetic tree of Calmanostraca. Castracollis wilsonae was used to root the tree. Kazacharthra as sister group to Notostraca. A distinction is made between Lepidurus batesoni and Lepidurus s. str. (including all other species of Lepidurus) because the first one does not show a modified and elongated first thoracic appendage in contrast to Lepidurus s. str. and Triops