The megisthanid mites (Mesostigmata: Megisthanidae) of Australia Author Seeman, Owen D. text Zootaxa 2019 2019-02-28 4563 1 1 40 journal article 28158 10.11646/zootaxa.4563.1.1 3e3068c1-c158-4d97-9aec-31fc80551edb 1175-5326 2600858 A44D4C11-ADA1-48A8-9F00-B46BDF7B2A49 Key to species of Australian Megisthanidae (females required; males supplementary) 1. Dorsal shield lyriform ( Fig. 6A ); posterior dorsal shield setae thick, short, with strong barbs ( Figs 7 D–E); internal genitalia with well-developed latigynal element ( Fig. 7B )............................................................. 2 - Dorsal shield ovate ( Fig. 1A ); posterior dorsal setae slender, usually longer, smooth or with fine barbs ( Figs 3D , 17C ); internal genitalia lacking well-developed latigynal element ( Figs 3 B–C)................................................. 3 2. Posterior dorsal shield setae each with 0–2 barbs ( Fig. 7D )......................................... M . leviathanicus - Posterior dorsal shield setae with many (ca. 10) barbs ( Fig. 7E )................................. M . manonae sp. nov. 3. Seta pd2 on femur IV on large projection ( Fig. 17D ); dorsal shield densely covered with short fine setae ( Fig. 16A ); sternogynal shields widely separated (by about width of sternogynal shield) ( Fig. 17A )................... M . womersleyi sp. nov. - Seta pd2 on femur IV not on projection ( Fig. 3E ); dorsal shield less hypertrichous, with at least some long setae ( Figs 1A , 12A , 21A ); sternogynal shields not widely separated (by much less than width of sternogynal shield) ( Fig. 3A )................ 4 4. Medial dorsal shield with two distinct types of setae: a short, heavily barbed form and a long, smooth or sparsely barbed form ( Figs 11 A–B)......................................................................................... 5 - Medial dorsal shield with one type of seta, a long, smooth, barbed form (some long setae may be present on margins) ( Figs 1A , 12A , 21A )........................................................................................... 6 5. Medial opisthosoma with distinct patch of short pilose setae ( Fig. 11B )................................... M . thorelli - Medial opisthosoma without distinct patch of short pilose setae ( Fig. 11A ), differentiation between long and short setal types less distinct than on podosoma........................................................... M . simoneae sp. nov. 6. Setae st4 present ( Fig. 3A ); host Pharochilus spp............................................. M . modestus sp. nov. - Setae st4 absent ( Figs 14A , 22B ); host Aulacocyclus spp....................................................... 7 7. Podonotum and opisthonotum densely setose ( Fig. 12A ); genital setae long, 60–110; with 5–11 setae behind margin of genital shield ( Fig. 14A ); male sternoventral shield highly hypertrichous around genital opening (approximately 50-60 setae; Fig. 14D )............................................................................... M . southcotti sp. nov. - Podonotum more setose than opisthonotum ( Fig. 21A ); genital setae short, 20–35; with 0–2 setae behind margin of genital shield ( Fig. 22A ); male sternoventral shield much less hypertrichous around genital opening (at most 20 setae; Fig. 22E )........................................................................................ M . zachariei sp. nov.