The oribatid mite genus Topalia in Australia (Oribatida: Nosybeidae) and the taxonomic status of related families and genera Author Colloff, Matthew J. text Zootaxa 2019 2019-07-26 4647 1 290 321 journal article 25550 10.11646/zootaxa.4647.1.18 6446fee7-99f6-43cd-b37a-bb6ce3fade53 1175-5326 3353104 0A0CA1A2-046F-4D23-A7A9-02D2DB974D4D Key to the species of Topalia The following key is to adults, without the cerotegument present. 1. With the following combination of characters: notogastral ridges in an inverted T-shape; pair of condyles on interlamellar region of prodorsum; two pairs of epimeral foveolae present........ Topalia katyae sp. nov. ( Australia , 347 × 213 µm ; Fig. 6 ) - Without the above combination of characters............................................................... 2 2. With single longitudinal notogastral ridge with pair of hollows laterally; with enantiophysis E2 (on epimeral border II) and enantiophysis V (on epimeral border III); interlamellar region with pair of acute condyles overhanging dorsosejugal suture................................................... Topalia africana Mahunka, 1985 ( South Africa , 388 × 244 μm) - Without the above combination of characters............................................................... 3......................................... Topalia problematica Balogh & Csiszár, 1963 ( Argentina , 387 × 231 µm ) - Without the above combination of characters............................................................... 4 3. With two pairs of longitudinal notogastral ridges; a longer median pair and a shorter lateral pair; with enantiophysis V (on epimeral border III); aggenital setae posterolateral of genital plate (slightly posterior and lateral to setae g 4 )............... 4. With one pair of Longitudinal notogastral ridges curving medially, extending lateral and posterior of setae dm ; at least some of setae of h and p series on squat tubercles; pedotectum I with teeth on anterior margin................................................................................... Topalia velata Hammer, 1966 ( New Zealand , 350 × 221 μm) - Without the above combination of characters............................................................... 5 5. With one pair of straight longitudinal notogastral ridges extending from anterior margin of notogaster as far as setae dm ; interlamellar region with pair of short longitudinal laths extending from setae in to dorsosejugal suture, each terminating in a short, blunt condyle....................................... Topalia clavata Hammer, 1966 ( New Zealand , 370 × 258 μm) - Without the above combination of characters............................................................... 6 6. With one pair of longitudinal notogastral ridges strongly pinched or waisted (‘keyhole-shaped’) anterior of setae dm ; with inverted V-shaped ridge in interlamellar region; setae le on anteriomedian edge of lamellae............................................................................. Topalia granulata Hammer, 1966 ( New Zealand , 335 × 240 µm ) - With one pair of longitudinal notogastral ridges curving medially, narrow anterior of setae dm and expanding posteriorly around domed centrodorsal region.............................................................................. 7 7. Anteromedial edges of lamellae separated almost as far posteriorly as insertion points of setae in ; (3) interlamellar region domed; anterior margin of notogaster transverse medially, then stepped posterior of bothridia; notogastral cerotegument of coarse irregular granules and tubercles overlaying fine pattern of angular foveolae...................................................................................... Topalia caliginosa sp. nov. ( Australia , 370 × 226 µm ; Fig. 1 ) - Without the above combination of characters............................................................... 8 8. Anterior margin of notogaster curved, convex; cerotegument a network of large foveolae separated by angular ridges interspersed with minute granular tubercles; with series of parallel striae anterior of the genital plates............................................................................ Topalia dunlopi sp. nov. ( Australia , 347 × 211 μm; Fig. 5 ). - Anterior margin of notogaster indented; cerotegument lacking angular ridges; region anterior of genital plates smooth..... 9 9. Notogastral cerotegument of fine granules; epimeres III and IV appearing separated.................................................................................... Topalia corinnensis sp. nov. ( Australia , 416 × 252 μm; Fig. 4 ) - Notogastral cerotegument of coarse foveolae and minute tubercles; epimeres III and IV appearing partly fused..................................................................... Topalia royi sp. nov. ( Australia , 353 × 205 μm; Fig. 7 )