Figure 13 from: Ganske A-S, Edgecombe GD, Akkari N (2018) The peristomatic structures as a source of systematic characters in the genus Lithobius Leach, 1814 (Myriapoda, Chilopoda). In: Stoev P, Edgecombe GD (Eds) Proceedings of the 17th International Congress of Myriapodology, Krabi, Thailand. ZooKeys 741: 49-75. https://doi.org/10.3897/zookeys.741.21706

Figure 13 Examples of number and shape of the hypopharyngeal spines and surrounding pores of Lithobiidae. A Eupolybothrus (Eupolybothrus) grossipes; several tapering spines with trifurcate spines (asterisks) in between and a continuous transition to the tuft area (arrow) B Lithobius (Lithobius) agilis; few short tapering spines; several single pores C Lithobius (Lithobius) muticus; long and tapering spines; distinct break (arrow) between hypopharyngeal spine field and branching bristles of tuft D Lithobius (Lithobius) validus; hypopharyngeal spines surrounded by cluster of up to six pores (arrow) E Lithobius (Lithobius) cyrtopus; flattened and ridged spines F Lithobius (Lithobius) castaneus; detail of a long tapering spine close to a single pore (arrow). hsp – hypopharyngeal spine field, tu – tuft of bristles.