Fig. 3

The Wnt gene complements of spiders and a harvestman. Note the duplicated Wnt genes in arachnopulmonate chelicerates compared to non-arachnopulmonate chelicerates. The asterisk (*) indicates that the complement of other entelegyne spiders is identical with that of Parasteatoda with the exception that a second Wnt4 paralog has been retained. Dark grey box marks spiders, light grey box marks non-spider chelicerates. An expanded overview over Wnt gene complements in Panarthropoda is provided in Additional file 1: Fig. S1. Full species names and sources of gene content: Acanthoscurria geniculata (embryonic transcriptome); Centruroides sculpturatus (genome); Charinus acosta (embryonic transcriptome); Euphrynichus bacillifer (embryonic transcriptome); Ixodes scalpularis (genome); Parasteatoda tepidariorum (genome and embryonic transcriptome); Phalangium opilio (embryonic transcriptome); Pholcus phalangioides (embryonic transcriptome). Two overlaying boxes indicate the presence of two orthologs. The figure is based on previously published data and the color code follows these studies (e.g., [21, 28, 39]). Abbreviations: e, expression has been studied, but no specific signal has been reported; E, expression has been studied; F, functional studies are available