Distribution of the family Haplodesmidae, genus Eutrichodesmus in mainland China. Red lines show the transect Mengla – Hekou – Beichuan – Guiyang – Huanjiang – Guilin – Yichang – Qingyuan – Guidong – Fenyi – Wuyishan – Hangzhou, along which the elevations are crudely indicated below. 1 E. dorsiangulatus 2 E. monodentus 3 E. arcicollaris 4 E. triangularis 5 E. tenuis 6 E. latellai 7 E. obliteratus 8 E. incisus 9 E. latus 10 E. soesilae 11 E. triglobius 12 E. distinctus 13 E. trontelji 14 E. planatus 15 E. similis 16 E. sketi 17 E. lipsae 18 E. jianjia 19 E. apicalis 20 E. digitatus 21 E. spinatus 22 E. simplex 23 E. anisodentus 24 E. pectinatidentis.