Figure 2.

Hox genes and microRNAs support an unduplicated genome in the daddy-long-legs P. opilio. (a) Hox gene-containing scaffolds to scale. miRNAs mir-10 and iab-4 are represented by vertical bars. Hox genes are depicted in coloured boxes, and other predicted genes in grey boxes. (b) Hox clusters in selected arthropod genomes (after [5,31]). (c) Comparative analysis of miRNA families and orthologue copy numbers in P. opilio and other chelicerates supports retention of single copies of several families in harvestmen, in contrast to duplication found in arachnopulmonates. Columns correspond to individual miRNA families, with colours representing a different number of paralogues. miRNAs in bold are duplicated in P. opilio and most other chelicerates. 1: Araneae; 2: Scorpiones; 3: Pseudoscorpiones; 4: Xiphosura; 5: Opiliones; 6: Acariformes; 7: Parasitiformes. (Online version in colour.)