Key to species of Eutarsopolipus from Castelnaudia The key to species of the piratica subgroup was also published in Seeman (2019b); E. piraticus is included although its host is Trichosternus. The key is primarily to adult females although larvae are helpful for separation of some species. 1. Claw on leg I absent, unguinal setae on tarsi II-III massive, hook-like. (piratica subgroup)........................... 2 - Claw on leg I present, unguinal setae on tarsi II-III enlarged, bifid, never hook like................................. 4 2. Tarsi II-III with seta pl″ long, 75–95. Hosts: Castelnaudia eungella and C. wilsoni ........... E. verberatus Seeman, 2019b - Tarsi II-III with seta pl″ shorter, 35–53.................................................................... 3 3. Setae v1 far apart (63–94); setae tc″ on tarsi II–III comparatively large and obviously thorn-like, length 4–5… Host: Castelnaudia obscuripennis .............................................................. E. uncatus Seeman, 2019b - Setae v1 closer together (47–58); setae tc″ on tarsi II–III comparatively smaller and merely thickened, length 2–3… Hosts: Trichosternus frater and T. mutatus ................................................. E. piraticus Seeman, 2019b 4. At least some idiosomal setae significantly thickened, sometimes bulbous. (hadros subgroup)......................... 5 - All idiosomal setae slender.............................................................................. 7 5. Setae sc1 sometimes thickened but not bulbous (Fig. 10); anterior margin of prodorsal shield deeply concave (Fig. 1)… Host: Castelnaudia setosiceps .................................................................. E. hadros sp. nov. - Setae sc1 strongly thickened to bulbous (Fig. 10); anterior margin of prodorsal shield weakly concave or straight......... 6 6. Larvae with shorter setae c1 8–11, d 7–10, f 7–10; female generally with shorter dorsal setae: v1 7-10, c1 6–12, d 10–15, f 7–12 (Fig. 11)… Host: Castelnaudia cordata ................................................... E. umbonatus sp. nov. - Larvae with longer setae c1 13–20, d 11–12, f 14–19; female generally with longer dorsal setae: v1 10–13, c1 10–20, d 12–21, f 11–19 (Fig. 9)… Host: Castelnaudia mixta .................................................. E. mixtus sp. nov. 7. Anterior tip of gnathosoma rounded....................................................................... 8 - Anterior tip of gnathosoma indented, giving a lip-like appearance. (basiatus subgroup)............................. 12 8. Setae h small but developed. (nahmani subgroup)..........................................................… 9 - Setae h minute (not larger than alveolus) or absent. (despoticus subgroup)....................................... 11 9. Gnathosoma large, 67–70 x 69–72; distance d-d 200–230; genua II-III setae l′ 5–7, tibia I seta l′ 9–11 (Fig. 12)… Host: Castelnaudia septemcostata ................................................................... E. nahmani sp. nov. - Gnathosoma smaller, 57–61 x 48–54; distance d-d 115–140; genua II-III setae l′ 2–4, tibia I seta l′ 4–7................ 10 10. Setae h small, 2–4; tarsus III with small setae tc′ 2, pv′ 2–3 (Figs. 17, 18)… Host: Castelnaudia septemcostata. E. raveni sp. nov. - Setae h longer, 7–10; tarsus III with larger setae tc′ 3–4, pv′ 4 (Figs. 21, 22)… Host: Castelnaudia porphyriaca. E. teuceri sp. nov. 11. Gnathosoma large, 61–65 x 60–67, cheliceral stylets 75–84, tarsi II-III setae tcʹʹ 3–4 (Figs 25–26)… Host: Castelnaudia cordata ................................................................................ E. hebronae sp. nov. - Gnathosoma smaller, 45–51 x 47–51, cheliceral stylets 50–55, tarsi II-III setae tcʹʹ 2–3 (Figs 24–26)… Host: Castelnaudia porphyriaca ........................................................................ E. despoticus sp. nov. 12. Setae sc1 15; distance d -d 135–150, f-f 100–120.......................................................... 14 13. Setae c1 15–17, seta d 16–22; distance v2-v2 38–40; sc1-sc1 61–65; v1-sc1 16–20; tibia I seta v′ 2; genua II-III setae l′ minute (Figs 37–38). Host: Castelnaudia cordata ................................................... E. osculum sp. nov. - Setae c1 6–9, d 7–9; distance v2-v2 48–62; sc1-sc1 82–100; v1-sc1 36–46; tibia I seta v′ 5–6; genua II-III setae l′ 3–4 (Figs 28–29). Host: Castelnaudia porphyriaca .................................................... E. basiatus sp. nov. 14. Cheliceral seta 24–39 (Fig. 39); larva with short setae c1 6–9, c2 9–12, d 7–10. Host: Castelnaudia eungella ... E. savatus sp. nov. - Cheliceral seta 17-21 (Fig. 32); larva with longer setae c1 15–18, c2 19–24, d 17–19 (Fig. 35). Host: Castelnaudia marginifera .................................................................................................................................................................................. E. labiatus sp. nov.

Published as part of Seeman, Owen D., 2021, Contrasting species diversification of Eutarsopolipus (Acariformes: Podapolipidae) on Castelnaudia and Notonomus (Coleoptera: Carabidae), pp. 1-74 in Zootaxa 4971 (1) on pages 9-10, DOI: 10.11646/zootaxa.4971.1.1, http://zenodo.org/record/4771514