Fig. 3

Hox gene duplications in Amblypygi. a Schematic representation of the number of copies of each of the ten Hox genes in the selected arthropod terminals. Dotted squares in the amblypygids Phrynus marginemaculatus, Charinus israelensis, and C. ioanniticus indicate absence from the transcriptome. Empty squares in Parasteatoda, Centruroides, and Tetranychus indicate absence from the genome. Number of Hox genes in Carcinoscorpius rotundicauda after [35] (but see [102] for evidence of additional copies). b Tree topology inferred from maximum likelihood analysis of a conserved region (71 amino acid characters) using the same terminals of the schematics (ln L = − 3442.810). Numbers on the notes are ultrafast bootstrap resampling frequencies (only > 80% shown). Species: Phrynus marginemaculatus (Pmar); Charinus israelensis (Cisr); C. ioanniticus (Cioa); Parasteatoda tepidariorum (Ptep); Centruroides sculpturatus (Cscu); Ixodes scapularis (Isca); Tetranychus urticae (Ttur); Strigamia maritima (Smar); Drosophila melanogaster (Dmel); Tribolium castaneum (Tcas). lab: labial; pb: proboscipedia/maxillopedia; Hox3: Hox3/zerknullt/z2; Dfd: Deformed; Scr: Sex combs reduced; ftz: fushi tarazu; Antp: Antennapedia/prothorax-less; Ubx: Ultrabithorax; abdA: abdominal-A; AbdB: Abdominal-B