FIGURE 1. Dolichosyne Ponomarenko, 1969 habitus photos. 1, D. confragosa PIN 2785-2675 new material. 2, 3, D. confragosa paratype PIN 2070-1551 part and counterpart. 4, D. rostrata holotype PIN 2555/1735. 5, D. sulcata holotype PIN 2240-274 part. 6, D. sulcata paratype PIN 2240-234 part. 7, D. sulcata paratype PIN 2240-305 part. 8, D. sulcata PIN 2785-2659. Scale bars equal 1 mm.

FIGURE 2. Dolichosyne Ponomarenko, 1969 line drawings. 1, D. confragosa PIN 2785-2675. 2, 3, D. confragosa paratype PIN 2070-1551 part and counterpart. 4, D. rostrata holotype PIN 2555/1735. 5, D. sulcata holotype PIN 2240-274 part. 6, D. sulcata paratype PIN 2240-234 part. 7, D. sulcata paratype PIN 2240-305 part. 8, D. sulcata PIN 2785-2659. Scale bars equal 1 mm.

Label abbreviations: c.e - compound eye; cx1, 2 - pro- and mesocoxae; eps3 - metepisternum; gul - gular plate (gula); i.p1 - prosternal intercoxal process; l.d - pronotal longitudinal depression; l.i - lateral incisions of submentum; l.r - longitudinal ridge; msc - mesoscutum; mt - mentum; par - parietal; pl1 - propleurit; p.mt - prementum; p.t.p. - posterior tentorial pit; scl - scutellum; sct - mesoscutum; smt - submentum; s.scl - subocular suture; tr1 - protrochanter; tr3 - metatrochanter.

FIGURE 3. Genera of Ademosynidae family, habitual photos. 1, Gnathosyne akkolkensis Ponomarenko, 1969, holotype, PIN 2496/7 counterpart. 2, Ademosyne kirgizica Ponomarenko, 1969, holotype PIN 2096/1369. 3, 4, A. kirgizica Ponomarenko, 1969 paratype PIN 2555/1696 print and counterprint. 5, A. bacca Ponomarenko, 1969, holotype PIN 2240/310. 6, A. bacca Ponomarenko, 1969, paratype PIN 2240/294. 7, A. ellyptica Ponomarenko, 1969, holotype PIN 2240/224. 8, Cephalosyne capitata Ponomarenko, 1969 holotype PIN 2240/302. Scale bars equal 1 mm.

FIGURE 4. Genera of Ademosynidae family, line drawings. 1, Gnathosyne akkolkensis Ponomarenko, 1969, holotype, PIN 2496/7 counterpart. 2, Ademosyne kirgizica Ponomarenko, 1969, holotype PIN 2096/1369. 3 A. kirgizica Ponomarenko, 1969, paratype PIN 2555/1696 print and counterprint. 4, A. bacca Ponomarenko, 1969 holotype PIN 2240/310. 5, A. bacca Ponomarenko, 1969, paratype PIN 2240/294. 6, A. ellyptica Ponomarenko, 1969, holotype PIN 2240/224. 7, Cephalosyne capitata Ponomarenko, 1969, holotype PIN 2240/302. Scale bars: 1 mm.

Label abbreviations: c.e - compound eye; crd - cardo; cx.r - coxal rests; cx1, 2 - pro- and mesocoxae; ep - epipleura; epm2 - mesepimeron; fm1 - profemur; gul - gular plate (gula); i.p1 - prosternal intercoxal process; l.d - pronotal longitudinal depression; l.i - lateral incixions of submentum; l.r - longitudinal ridge; md - mandibles; msc - mesoscutum; mt - mentum; ms.p - mesosternal pit; o.f - occipital foramen; par - parietal; pd - pedicellus; pl1 - propleurite; p.mt - prementum; p.t.p. - posterior tentorial pit; sc - scapus; scl - scutellum; sct - mesoscutum; s.g - gular suture; s.l2 - longitudinal suture of mesoventrite; s.l3 - longitudinal suture of metaventrite; smt - submentum; s.pc - paracoxal suture.

FIGURE 5. Petrosyne Ponomarenko, 1969 and ademosynid beetles re-assigned to Polyphaga suborder, photos and line drawings. 1, 2 Petrosyne liassica Ponomarenko, 1969, holotype PIN 166/39. 3, 4 Ranis collevus Ponomarenko, 1969, holotype PIN 371/1755 and line drawing. 5, 6, R. ovalis Ponomarenko, 1969, holotype PIN 2066/2642. Scale bars equal 1 mm.

Label abbreviations: cx.r - coxal rests; msc - mesoscutum; tb1 - protibia.

FIGURE 6. Comparative morphology of †Ademosynidae, polyphagan beetles and stem group Coleoptera. 1, 2, Stenocyphon sasaji Lawrence, 2001. 3, 4, Epiphanis cornutus (Eschscholtz, 1829). 5, 6, Dolichosyne sulcata Ponomarenko, 1969. 7, 8 Gnathosyne akkolkensis Ponomarenko, 1969. 9, 10, Archosyne permiana Ponomarenko et al., 2014. 11, 12, Tecticupes heckeri Rohdendorf, 1961 (†Taldycupedidae). 13, 14, Permocupes sojanensis Ponomarenko, 1963 (†Permocupedidae). Scale bars equal 1mm. Label abbreviations: mb.c - membranous connection.

FIGURE 7. Strict consensus tree of 71 minimum length trees (NONA, ratchet, 1000 replicates, all characters unweighted and unordered), 91 steps, consistency index 0.43. Monopyhyly of †Ademosynidae supported by two unambiguous apomorphies: anterior pronotal margin convex and overlapping posterior part of head (18.1), anterolateral pronotal angles absent (19.1). Systematic position of †Ademosynidae and Archosyne ambiguous.