Figure 5. Bivariate plot of basicranial width (X axis) vs. oblique diameter of first cochlear turn (Y axis) in several extant and fossil bats. Polygons enclose distributions for megachiropterans (blue diamonds) and three extant microbat groups (black circles). Note that Tanzanycteris mannardi (large red square) falls at the extreme range of hipposiderines and near rhinolophines. Other Eocene bats designated by large green triangles include (from left to right) Palaeochiropteryx, Icaronycteris, Archaeonycteris, and Hassianycteris. Note that these taxa all fall between megachiropterans and vespertilionids.