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FIGURES 31–32 in A survey of the Sumatran Ctenidae (Araneae). 4. A new species of Acantheis Thorell, 1891 with unique copulatory organs morphology

FIGURES 31–32. Collecting locality of Acantheis kazanstevae sp. nov. The frame on Fig. 31 refers to the content of Fig. 32.

FIGURES 1–4 in A survey of the Sumatran Ctenidae (Araneae). 4. A new species of Acantheis Thorell, 1891 with unique copulatory organs morphology

FIGURES 1–4. Habitus of Acantheis kazantsevae sp. nov., male (1–2) and female (3–4). 1, 3—dorsal; 2, 4—ventral. Scale: 2 mm.

FIGURES 25–30 in A survey of the Sumatran Ctenidae (Araneae). 4. A new species of Acantheis Thorell, 1891 with unique copulatory organs morphology

FIGURES 25–30. Acantheis kazanstevae sp. nov., epigyne, intact (25) and macerated (26–30). 25, 26, 29—ventral, 27, 30— dorsal, 28—posterior. Scale bar: 0.2 mm. Abbreviations: CO—copulatory opening, LT—lateral tooth, SS—septal stem, SB— septal base, CD—copulatory duct, ReI—receptacle's chamber I, ReII—receptacle's chamber II.

FIGURES 20–24 in A survey of the Sumatran Ctenidae (Araneae). 4. A new species of Acantheis Thorell, 1891 with unique copulatory organs morphology

FIGURES 20–24. SEM photographs of bulb (20), tegular apophysis (21), epigyne (22) and ventral spine's locking mechanism in female's femorae I (23–24) of Acantheis kazantsevae sp. nov. Scale: 20=0.3 mm; 21–22=0.1 mm; 23–24=0.02 mm. Abbreviations: AE—embolic arm, AT—anterior arm of tegular apophysis, C—conductor, CO—copulatory opening, ET— embolic tip, PT—posterior arm of tegular apophysis, St—subtegulum, TA—tegular apophysis, TC—cavity of tegular apophysis, TE—prolateral extension.

FIGURES 11–19 in A survey of the Sumatran Ctenidae (Araneae). 4. A new species of Acantheis Thorell, 1891 with unique copulatory organs morphology

FIGURES 11–19. Male palp (11–15) and bulb (16–19) of Acantheis kazantsevae sp. nov. 11, 16—prolateral; 12, 17—ventral; 13, 15, 18—retrolateral; 14—dorsal; 19—anterior. Scale: 0.2 mm. Abbreviations: AE—embolic arm, AT—anterior arm of tegular apophysis, C—conductor, E—embolus, ES—embolic spur, ET—embolic tip, PT—posterior arm of tegular apophysis, Sf—sperm duct, St—subtegulum, T—tegulum, TC—cavity of tegular apophysis, TE—prolateral extension, VB—ventrad bulge, VE—ventral extension, VTA—ventral tibial apophysis.

FIGURES 5–10 in A survey of the Sumatran Ctenidae (Araneae). 4. A new species of Acantheis Thorell, 1891 with unique copulatory organs morphology

FIGURES 5–10. Prosoma (5), cephalic part (6), chelicera (7), leg I (8), femur I (9) and spinnerets (10) of Acantheis kazantsevae sp. nov. 5—male, lateral; 6—ditto, anterior; 7—ditto, posterior; 8, 9—female, retrolateral; 10—male, ventral. Scale: 5=0.5 mm, 8=1 mm; 6–7, 10=0.2 mm. Abbreviation: v —ventral spines.

FIGURES 30–35 in A survey of the Sumatran Ctenidae (Araneae). 1. Two new Acantheis species

FIGURES 30–35. Terminal part of the embolus (30–31) and female genitalia (32–35) of Acantheis sergeimeshenini sp. n. (30), and A. andreimishenini sp. n. (31–35). 30, 31—retrolateral; 32—intact epigyne, ventral; 33—macerated epigyne, ventral; 34—endogyne, dorsal; 35—epigyne, posterior. Scale: 0.2 mm. Abbreviations: Cn—conductor, DB—dorsal branch of embolus, Em—embolus, ET—epigynal tooth, Fo—fovea, ME—membranous extension of embolus, RI—receptacle's chamber I, RII—receptacle's chamber II, Re—receptacle, SB—septal base, SH—septal hump, SS—septal stem, VB—ventral branch of embolus.

FIGURES 7–11 in A survey of the Sumatran Ctenidae (Araneae). 1. Two new Acantheis species

FIGURES 7–11. General appearance (7–8), cephalic part (9) and prosoma with legs (10–11) of Acantheis sergeimishenini sp. n. (7–9), and A. andreimishenini sp. n. (10–11). 7—male, dorsal; 8—ditto, ventral; 9—ditto, anterior; 10—ditto, lateral; 11—female, lateral. Scale: 7, 8, 10, 11=1 mm. Abbreviation: CS—cluster of stiff setae.

FIGURES 1–6 in A survey of the Sumatran Ctenidae (Araneae). 1. Two new Acantheis species

FIGURES 1–6. Habitus of Acantheis sergeimishenini sp. n. (1–2), and A. andreimishenini sp. n. (3–6). 1, 3—male, dorsal; 2, 4—male, ventral; 5—female, dorsal; 6—female, ventral. Scale: 2 mm.

FIGURES 22–29 in A survey of the Sumatran Ctenidae (Araneae). 1. Two new Acantheis species

FIGURES 22–29. Bulb of Acantheis sergeimishenini sp. n. (22–25), and A. andreimishenini sp. n. (26–29). 22, 26—prolateral; 23, 27—ventral; 24, 28—retrolateral; 25, 29—apical. Scale: 0.2 mm. Abbreviations: BP—basal process of embolus, Cn— conductor, DB—dorsal branch of embolus, EB—embolic base, Em—embolus, ES—embolic spike, ME—membranous extension of embolus, SD—sperm duct, SN—subtegular notch, St—subtegulum, TA—tegular apophysis, Te—tegulum, TP—tegular process, VB—ventral branch of embolus.

FIGURES 46–48 in A survey of the Sumatran Ctenidae (Araneae). 1. Two new Acantheis species

FIGURES 46–48. Collecting localities of A. sergeimishenini sp. n. (circle), A. andreimishenini sp. n. (square), and A. dimidiatus Thorell, 1890 (triangle). The frame on Fig. 48 refers to the content of Fig. 47 and the frame on Fig. 47 refers to the content of Fig. 46.

FIGURES 36–44 in A survey of the Sumatran Ctenidae (Araneae). 1. Two new Acantheis species

FIGURES 36–44. Habitus (36), whole palp (37–38), terminal part of the palp (39–42), bulb (43) and labels (44–45) of the holotype of Acantheis dimidiatus Thorell, 1890. 36, 42—dorsal; 37, 39—prolateral; 38, 41—retrolateral; 40, 43—ventral.

FIGURES 12–21 in A survey of the Sumatran Ctenidae (Araneae). 1. Two new Acantheis species

FIGURES 12–21. Male palp of Acantheis sergeimishenini sp. n. (12–16), and A. andreimishenini sp. n. (17–21). 12, 17—whole palp, retrolateral; 13, 18—terminal part of the palp, prolateral; 14, 19—ditto, ventral; 15, 20—ditto, retrolateral; 16, 21—ditto, dorsal. Scale: 12, 17=1 mm; 13–16, 18–21=0.5 mm. Abbreviations: RTA—retrolateral tibial apophysis.