Two new species of Acanthocyrtus Handschin, 1925 (Collembola, Entomobryidae Entomobryinae) from Western Australia Author Cipola, Nikolas Gioia Laboratório de Sistemática e Ecologia de Invertebrados do Solo, Instituto Nacional de Pesquisas da Amazônia-INPA, CPEN. Avenida André Araújo, 2936, Aleixo, CEP 69067 - 375, Manaus, AM, Brazil. Author Greenslade, Penelope 0000-0002-2123-5306 School of Science, Psychology and Sport, Federation University, Mt Helen, Ballarat, Victoria 3353, Australia. p. greenslade @ federation. edu. au; https: // orcid. org / 0000 - 0002 - 2123 - 5306 & Department of Biology, Australian National University, GPO Box, Australian Capital Territory 0200. p.greenslade@federation.edu.au text Zootaxa 2022 2022-04-04 5124 3 341 358 journal article 53384 10.11646/zootaxa.5124.3.4 c82bdeba-416d-4289-8874-fc342820735e 1175-5326 6410892 83E79ECE-70BB-4B88-BBBE-E8DC6565ED49 Key to species of Acanthocyrtus 1 Tenent hair chavate ( Fig. 8E ); Australian species............................................................ 2 - Tenent hair pointed; African species................................................ A. marginalis Salmon, 1956 2 Prelabral chaetae ciliate................................................................................ 3 - Prelabral chaetae smooth............................................................................... 4 3 Head with 7 sutural mac; Th II–III respectively with 9 and 7 mac in p1–3 complex; Abd I with 4 mac; Abd IV with 19 central mac.......................................................................... A. lineatus Womersley, 1934 - Head with 5 sutural mac; Th II–III respectively with 4 and 5 mac in p1–3 complex; Abd I with 2 mac; Abd IV with 15 central mac............................................................................ A. spinosus ( Schött, 1917 ) 4 Labral papillae present ( Figs 3E , 9C )..................................................................... 5 - Labral papillae absent.................................................................................. 6 5 Head and Abd III–IV with lateral spots ( Fig. 2 ); labral inner papillae conical, outer papillae reduced to a small rounded projection ( Fig. 3E ); labial papilla E l.p. surpass the base of a.a. ( Fig. 4A ); manubrium ventro-distally with 3 inner chaetae ( Fig. 7B ) A. necropolitanus sp. nov. - Head and trunk depigmented ( Fig. 8 ); labral inner papillae with 3 projections and outer papillae with 4 projections ( Fig. 9C ); labial papilla E l.p. not reach the base of a.a. ( Fig. 9E ); manubrium ventro-distal with 2 inner chaetae ( Fig. 11F )................................................................................................ A. pallidus sp. nov. 6 Ant IV apical bulb bilobed; Th II with 24 mac in p1–3 complex; Abd III with 5 lateral mac; Abd IV with 20 central mac; mucronal proximal tooth clearly smaller than distal, mucronal basal spine surpassing the proximal tooth........................................................................... A. barrowensis Zhang, 2009 (in: Zhang et al. 2009 ) - Ant IV apical bulb absent; Th II with 17 or less mac in p1–3 complex; Abd III with 4 lateral mac; Abd IV with 15 or less central mac; mucronal teeth subequal, mucronal spine reaching the apex of proximal tooth................................. 7 7 Head S1 and S4 mac present and Pe5 absent; labial basomedian field with 3 smaller chaetae ( M2 , R and RS ); Th II with 6 and 17 mac respectively in m2 and p3 complex; unguis a.t. absent............ A. loftyensis Zhang, 2009 (in: Zhang et al. 2009 ) - Head S1 and S4 mac absent and Pe5 present; labial basomedian field with 1 smaller chaetae ( M2 , RS absent); Th II with 5 and 15 mac respectively in m2 and p3 complex; unguis a.t. present............. A. yolngui Zhang, 2009 (in: Zhang et al. 2009 )