Figure 6 in Molecular evolutionary trends and biosynthesis pathways in the Oribatida revealed by the genome of Archegozetes longisetosus

Figure 6 The sensory systems of Archegozetes longisetosusand phylogenetic analysis of selected photoreceptor and chemosensory genes. a – Scanning electron micrograph (SEM) showing the end of tarsus on Archegozetes′ first leg. Images shows normal setae, but also modified chemosensory setae, namely eupathidia, both paired (p) and single (s), as well as an omega-3 solenidium. SEM picture courtesy of Michael Heethoff. b – Phylogeny and classification of opsin genes across the Metazoa, including those of several Chelicerata. The tree was constructed using a maximum likelihood approach (LG+F+R4 model) and rooted with a jelly fish opsin. Archegozetes sequences are depicted in red, Drosophila in turquoise; branch length unit is substitutions per site. c – Maximum likelihood phylogeny of ionotropic receptors and ionotropic glutamate receptors (LG+F+R6 model) of Archegozetes (Along), Dinothrombium (Dt), Leptothrombidium (Ld), Tetranychus (Tu) and Drosophila (Dmel). IR25a/IR8a and antenna/1 st leg IRs contain genes with known chemosensory function in Drosophila. The tree was rooted to the middle point; Archegozetes sequences are depicted in red, Drosophila in turquoise; branch length unit is substitutions per site. Bootstrap values can be found in the supplementary Figure S13. d – Maximum likelihood phylogenetic tree of gustatory receptors (JTT+F+R6 model) of Archegozetes(Along), Ixodes (Is), Tropilaelaps (Tm), Metaseiulus (Mocc) and Drosophila (Dmel). The tree was rooted to the middle point; Archegozetessequences are depicted in red, Drosophila in turquoise; branch length unit is substitutions per site. Bootstrap values can be found in the supplementary Figure S14. e – Combined image of volume rendering (grey) and reconstructed nervous system of Archegozetesin dorsal view. Color-code corresponds to different parts of the nervous system, as depicted in the legend. The blue structure in the middle of the synganglion is the part of the esophagus which penetrates the synganglion. Scale bar: 200 µm. Image courtesy of Sebastian Schmelzle based