Fig. 17

Schematic overview of conserved aspect of Wnt gene expression. Green expression (and green stars) represents expression in the pre-cheliceral region. Blue expression (and blue squares) represents expression in the ventral ectoderm of the appendages. Yellow expression (and yellow dots) represents segment-polarity gene like expression. Red expression (and red diamond) represents expression in the segment-addition zone. Note that data from Drosophila imaginal discs are often missing (*). The pale red diamond in Ek/WntA represents weak expression. In general, data-completeness may suffer from non-comprehensive studies. Data are mainly based on Hogvall et al. [28], Hayden and Arthur [22], Janssen et al. [39], Janssen and Posnien [36], Bolognesi et al. [4], Murat et al. [62] (and references therein), and this study. Species abbreviations: Ek, Euperipatoides kanangrensis (Onychophora), Po, Phalangium opilio (Chelicerata: Opiliones), Ag, Acanthoscurria geniculata (Chelicerata: Mygalomorpha), Pp, Pholcus phalangioides (Chelicerata: Aranea), Pt, Parasteatoda tepidariorum (Chelicerata: Aranea); Sm, Strigamia maritima (Myriapoda: Chilopoda); Gm, Glomeris marginata (Myriapoda: Diplopoda); Tc, Tribolium castaneum (Hexapoda: Coleoptera); Dm, Drosophila melanogaster (Hexapoda: Diptera)