A comparative morphology-based study of types and additional material of species previously assigned to Tetralaucopora Bernhauer, 1928, Tectusa Bernhauer, 1899, and various other genera of Oxypodina results in numerous taxonomic changes. Parocyusa Bernhauer, 1902, previously a synonym of Tectusa, is revalidated. The genus has a Holarctic distribution and currently includes 33 described species, 20 species in the West Palaearctic (including Middle Asia), twelve in the East Palaearctic, and two species (one of them probably native in the West Palaearctic) in the Nearctic region. The validity of two species, one from North Europe and one from Japan, requires confirmation and one name is treated as a tentative synonym. Ten of the West Palaearctic species are micropterous or submacropterous and have restricted distributions, whereas the remainder is macropterous and more or less widespread. Tectusa presently includes 41 described species, all of them micropterous and with restricted distributions, with the vast majority confined to mountain ranges in the Balkans. The genus is most likely polyphyletic. However, with the type material of several species (including the type species of available genus-group names) currently inaccessible, this issue will have to be addressed in a future revision. New combinations are proposed for all the species previously in Tetralaucopora and some previously in Tectusa or other genera, nine names are synonymized, and one name is preserved according to Article 23.9 of the Code (ICZN 1999): Parocyusa Bernhauer, 1902 = Tetralaucopora Bernhauer, 1928, resyn.; Parocyusa antennata (Eppelsheim, 1878), comb.n.; P. baicalensis (Eppelsheim, 1893), comb.n. = beijingensis (Pace, 1999), syn.n., = hebeiensis (Pace, 1999), syn.n.; P. bicolorata (Assing, 2007), comb.n.; P. caligula (Assing, 1996), comb.n.; P. carnica Lohse, 1988; P. championi (Cameron, 1939), comb.n.; P. crebrepunctata (Strand, 1962), comb.n.; P. fuliginosa (Casey, 1906), comb.n.; P. germana (Cameron, 1939), comb.n. = rougemonti (Pace, 1986), syn.n.; P. hartmanni (Pace, 2013), comb.n. (ex Ocalea); P. holdhausi (Bernhauer, 1902); P. japonica (Cameron, 1933), comb.n.; P. knabli (Bernhauer, 1914) = tirolensis Scheerpeltz, 1958, syn.n.; P. lebedevi (Bernhauer, 1928), comb.n. = bucharica (Bernhauer, 1928), syn.n.; P. longicollis (Eppelsheim, 1889), comb.n.; P. longitarsis (Erichson, 1839), comb.n., nomen protectum = attenuata (Stephens, 1832), nomen oblitum, = syriaca (Saulcy, 1865), syn.n.; P. montana (Kraatz, 1856), comb.n.; P. ripicola (Cameron, 1939), comb.n.; P. rubicunda (Erichson, 1837), comb.n. = cingulata (Kraatz, 1856), syn.n.; P. schuelkei (Assing, 1996), comb.n.; P. strupiiana Scheerpeltz, 1958; P. subcyanea (Cameron, 1939), comb.n.; P. yakouensis (Pace, 2010), comb.n. (ex Ocyusa); P. yunnanensis (Pace, 1993), comb.n.; "Ocyusa" fuscobrunnea (Cameron, 1939), comb.n.; "Cousya" quadrisulcata (Bernhauer, 1935) = nepalensis Pace, 2006, syn.n.; Oxypoda sinonigra (Pace, 2017), comb.n.; Oxypoda besucheti Focarile, 1982. Numerous species of Parocyusa and Tectusa are (re-) described and illustrated, among them 19 new taxa (nine of Parocyusa and ten of Tectusa): Parocyusa dilatata sp.n. (China: Yunnan); P. gilvipennis sp.n. (Kazakhstan); P. gonggaica sp.n. (China: Sichuan); P. gracillima sp.n. (South Turkey); P. kahleni sp.n. (South Slovenia); P. maculipennis sp.n. (Northwest Iran); P. matarata sp.n. (South Iran); P. spinosa sp.n. (China: Gansu); P. virilis sp.n. (Caucasus region: Russia, Armenia); Tectusa acrilobata sp.n (Erimanthos); T. apanoica sp.n. (Menalo); T. chelmosica sp.n. (Aroania); T. fimbriata sp.n. (Panahaiko); T. latilobata sp.n. (Giona, Iti, Parnassos); T. menaloica sp.n. (Menalo); T. parnonica sp.n. (Parnon); T. pauli sp.n. (Aroania); T. taygetana sp.n. (Taygetos); T. vodiasa sp.n. (Panahaiko). All the newly described Tectusa species are distributed in Greece and, except for T. to Tectusa are moved to the genus Duplocyusa gen.n. (type species Oxypoda uludaghensis Fagel, 1971), with the Carpathian species in the subgenus Carpocyusa subgen.n. (type species Tectusa nigromontis Zerche, 2007): Duplocyusa (Duplocyusa) uludaghensis Fagel, 1971, comb.n.; Duplocyusa (Carpocyusa) nigromontis (Zerche, 2007), comb.n.; D. (C.) bucegiensis (Zerche, 2007), comb.n.; D. (C.) transsylvanica (Zerche, 2007), comb.n.; D. (C.) rosenauensis (Zerche, 2007), comb.n.; D. (C.) ceahlauensis (Zerche, 2007), comb.n.; D. (C.) rodnaensis (Zerche, 2007), comb.n.; D. (C.) calimaniensis (Zerche, 2008), comb.n.; D. (C.) iucasensis (Zerche, 2008), comb.n. In an appendix on miscellaneous genera of Oxypodina, the following revalidation, synonymies, and new combinations are proposed, and five species are described: Eurylophus J. Sahlberg, 1876, revalidated = Drepasiagonusa Pace, 2012, syn.n.; Eurylophus grandiceps J. Sahlberg, 1876, comb.n. = feldmanni (Assing, 2018), syn.n.; Eurylophus smetanai (Pace, 2012), comb.n.; E. procerus (Assing, 2018), comb.n.; E. tibeticus (Assing, 2018), comb.n.; E. angulatus (Assing, 2018), comb.n. (all Eurylophus species except E. grandiceps ex Drepasiagonusa); "Cousya" lobifera Pace, 2015 (probably belonging to an undescribed genus); Cousya luteipennis sp.n. (Uzbekistan); Parocalea tenebricosa sp.n. (Russian Far East); Trichoglossina taiwafimbriata (Pace, 2010), comb.n. (ex Oxypoda); Trichoglossina retunsa sp.n. (China: Yunnan); T. tricuspidata sp.n. (China: Yunnan); Chinecousya globosa sp.n. (China: Yunnan). Lectotypes are designated for Chilopora antennata Eppelsheim, 1878, C. baicalensis Eppelsheim, 1893, C. ripicola Cameron, 1939, and C. championi Cameron, 1939. The distributions of Parocyusa rubicunda, a species with evidently parthenogenetic populations in large parts of its range, and of 17 species of Tectusa are mapped. Numerous new records are reported. [ABSTRACT FROM AUTHOR]