Median sensilla cluster and lateral spine fields on the epipharynx of Lithobiidae. ALithobius (Lithobius) validus; sensilla cluster arranged in an offset pattern; spine field arranged as single oblique row; Inset: Lithobius (Monotarsobius) aeruginosus; sensilla cluster arranged in line BLithobius (Lithobius) tenebrosus; sensilla cluster arranged symmetrically; spine field arranged as single oblique row with trifurcate spines (arrow) C Neolithobius aztecus; sensilla cluster arranged in an offset pattern; spine field arranged as single oblique row DEupolybothrus (Eupolybothrus) grossipes; sensilla cluster arranged in an offset-pattern and strongly overlapping with lateral spine field proximolaterally; spine field arranged as single oblique row ELithobius (Lithobius) pelidnus; spine field arranged as two rows (tendency of clustering) with bi- or trifurcate spines (arrows) and pores (asterisks) FLithobius (Monotarsobius) curtipes; spine field arranged as single oblique row GLithobius (Monotarsobius) aeruginosus; spine field arranged as single oblique row HLithobius (Monotarsobius) aeruginosus; tubercles on distal bar. lsp – lateral spine field, msc – median sensilla cluster.