Figure 4 in escription and evolutionary biogeography of the first Miocene jumping spider (Aranaea: Salticidae) from a southern continent

Figure 4. Eyes, fang, setae, and neuronal tissue of Simaetha sp. indet. (AM F.161027). Scanning electron micrographs were taken without coating the specimen. A, overview of the part of the cephalothorax with the anterior median eyes. B, setae on the dorsal edge of the left anterior median eye; arrowheads point to three prominent setae. C, area next to the right anterior median eye with left leg I (LL I), left fang (F) and a prominent seta (S). D, close-up of the fang. E, F, seta bases (SB) on the left leg I; arrowheads point to the impression of an underlying seta. G, area posterior to the right anterior median eye (AME) that includes structures reminiscent of neuropile (NP). H, I, close-up of the neuronal tissue shown in G and H, respectively. Images show a dense neuropile, consisting of unmyelinated axons. J, close-up of individual axons (AX) with a diameter of c. 1 μm. K, schematic drawing of the neuronal tissue in the corpus pedunculatus, a part of the anterior salticid syncerebrum that processes signals from the lateral eye [drawing adopted from (Hill 2006: fig. 36)]; the red rectangle marks a neuropile that is reminiscent to the structures depicted in H. Green rectangles mark areas that are depicted at larger magnifications in other panels. Scale bars: 100 μm (A); 50 μm (B, C, G); 25 μm (H); 10 μm (D, E, F, I); 2.5 μm (J).