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Fig. 1 in Systematic revision of the Plectopylinae (Gastropoda, Pulmonata, Plectopylidae)

Fig. 1. Nomenclature of parietal (A–C) and palatal (D–F) lamellae and plicae of plectopylids. A. Chersaecia Gude, 1899 sp. with a single lamella. B. Chersaecia sp. with two lamellae. C. Plectopylis Benson, 1860 sp. D–E. Chersaecia spp. F. Plectopylis sp. The long arrow shows the order of counting of the plicae. Abbreviations: af = apertural fold; al = anterior lamella; ap = additional plica; ip = intermediate plica; l = lamella; ll = left leg; lp = lower plica; mp = main plica; p = peristome; pl = posterior lamella; rl = right leg; ub = upper branch. Arrows under the numbers indicate the direction of the aperture.

Fig. 11 in Systematic revision of the Plectopylinae (Gastropoda, Pulmonata, Plectopylidae)

Fig. 11. Radula of Chersaecia Gude, 1899. A, C. Central and first lateral teeth. B, D. Marginal teeth. A–B. C. dextrorsa (Benson, 1860) (UF 76385). C–D. C. reversalis sp. nov. (UF 347047). All images: B. Páll-Gergely.

Fig. 28 in Systematic revision of the Plectopylinae (Gastropoda, Pulmonata, Plectopylidae)

Fig. 28. Genitalia of Chersaecia shanensis (Stoliczka, 1873). A. Whole genitalia. B. Male genitalia (penis, epiphallus, vas deferens). C–F. Inner structure of genital organs (C = penis, D = epiphallus, E = vagina, F = diverticulum). G. Spermatophore found in the bursa copulatrix. Scales bars: A–B = 2 mm; C–G = 1 mm. A–E show Specimen 1, PL040, loc. 20091018B, (NHMUK 20170150), F–G show Specimen 2, PL033, loc. 20091018C (NHMUK 20170151). For abbreviations see Fig. 2. All photos: B. Páll-Gergely.

Fig. 19 in Systematic revision of the Plectopylinae (Gastropoda, Pulmonata, Plectopylidae)

Fig. 19. Shells of species of Chersaecia Gude, 1899. A. C. leiophis (Benson, 1860), holotype of P. degerbolae Solem, 1966 (ZMUC-GAS-485). B. C. leiophis from Thailand (UF 346988). C. C. leucochila (Gude, 1897) comb. nov., holotype (NHMUK 1922.8.29.39). Scale bar = 10 mm. Photos: B. Páll-Gergely (A), T. Deli (B), H. Taylor (C).

Fig. 8. A in Systematic revision of the Plectopylinae (Gastropoda, Pulmonata, Plectopylidae)

Fig. 8. A. Shell of Chersaecia densegyrata sp. nov., holotype (UF 347223). B–C. Shell and protoconch of C. reversalis sp. nov., holotype (UF 347046). Scale bars: A–B = 10 mm; C = 1 mm. Images: T. Deli (A–B) and B. Páll-Gergely (C).

Fig. 18 in Systematic revision of the Plectopylinae (Gastropoda, Pulmonata, Plectopylidae)

Fig. 18. Shells and protoconch of species of Chersaecia leiophis (Benson, 1860). A–C. Shells from Myanmar (NHMUK 1888.12.4.1526–1528, two different shells). D. Probable syntype of P. pseudophis Godwin-Austen, 1875 (NHMUK 1903.7.1.754). E. Syntype of P. kengtungensis Gude, 1914 syn. nov. (NHMUK 1903.7.1.750). Scale of shells = 10 mm. Images: B. Páll-Gergely (B–C) and H. Taylor (A, D–E).

Fig. 7 in Systematic revision of the Plectopylinae (Gastropoda, Pulmonata, Plectopylidae)

Fig. 7. Parietal (A, C, E, G, J, K, M) and palatal (B, D, F, H, I, L, N) plication in species of Chersaecia Gude, 1899. A–B. C. austeni (Gude, 1899) (1903.06.01.1014.1). C–D. C. densegyrata sp. nov. (UF 347223). E–F. C. dextrorsa (Benson, 1860) (UF 346181). G–H. Chersaecia dextrorsa (UF 76507). I–J. C. brachyplecta (Benson, 1863) comb. nov. (after Gude 1914b). K–L. C. smithiana (Gude, 1897) comb. nov. (NHMUK 1888.12.4.1555–1556, two different specimens). M–N. C. reversalis sp. nov., paratype from type locality (UF 347046). Arrows below the letters indicate the direction of the aperture. Not to scale.

Fig. 23 in Systematic revision of the Plectopylinae (Gastropoda, Pulmonata, Plectopylidae)

Fig. 23. Shells and protoconch of species of Chersaecia Gude, 1899. A. C. perrierae (Gude, 1898), holotype (NHMUK 1922.8.29.40). B. C. perrierae, loc. 20091019A, Specimen 2 (coll. PGB). C–E. C. refuga (Gould, 1846), lectotype (MCZ 169335). Scale bar: A–C = 10 mm. Images: B. Páll-Gergely (B–E) and H. Taylor (A).

Fig. 27 in Systematic revision of the Plectopylinae (Gastropoda, Pulmonata, Plectopylidae)

Fig. 27. Genitalia of Chersaecia scabra sp. nov. (NHMUK 20170149). A. Male genitalia. B. Cross sectional diagram of the penis. C. Distal genitalia. D–F. Inner structure of genital organs (D = vagina, E = vas deferens, F = diverticulum). Scale bars: A, D–F = 0.5 mm; C = 2 mm; B not to scale. For abbreviations see Fig. 2. All photos: B. Páll-Gergely.

Fig. 17 in Systematic revision of the Plectopylinae (Gastropoda, Pulmonata, Plectopylidae)

Fig. 17. Distribution of plectopylid species in Northern Thailand. Legends: circle = Chersaecia auffenbergi sp. nov.; triangle = Chersaecia leiophis (Benson, 1860) (empty triangle shows the type locality of Plectopylis degerbolae Solem, 1966); empty square = Chersaecia perarcta simplex (Solem, 1966); cross = Chersaecia perarcta perarcta (Blanford, 1865); filled square = Chersaecia scabra sp. nov.; rhomb = Chersaecia densegyrata sp. nov.; the upper filled triangle also shows the locality of Naggsia oligogyra sp. nov.

Fig. 14 in Systematic revision of the Plectopylinae (Gastropoda, Pulmonata, Plectopylidae)

Fig. 14. Shells and protoconchs of species of Chersaecia Gude, 1899. A–B. C. auffenbergi sp. nov., holotype (UF 345566). C. C. goniobathmos (Ehrmann, 1922) comb. nov., lectotype (SMF 150100a). D–E. C. goniobathmos, paralectotype (SMF 150100c). F. C. feddeni (Blanford, 1865) comb. nov., syntype (NHMUK 1906.1.1.730). G. C. feddeni, holotype of P. ponsonbyi (Godwin-Austen, 1888) syn. nov. (NHMUK 1913.3.14.9). Scale bars: A, C–D, F–G = 10 mm; B, E = 1 mm. Photos: T. Deli (A), B. Páll-Gergely (B–E), H. Taylor (F–G).

Fig. 13 in Systematic revision of the Plectopylinae (Gastropoda, Pulmonata, Plectopylidae)

Fig. 13. Genitalia of Chersaecia reversalis sp. nov. (UF 347047). A. Male genitalia (penis, epiphallus, vas deferens). B. Whole genitalia. C–G. Inner structure of genital organs (C = proximal part of penis; D = distal part of penis; E = epiphallus; F = vagina; G = diverticulum). Scale bars: A–B = 5 mm; C–G = 0.5 mm. For abbreviations see Fig. 2. All photos: B. Páll-Gergely.

Fig. 11 in Taxonomic review of the tree snail genus Amphidromus Albers, 1850 (Pulmonata: Camaenidae) in Laos, with the description of two new species

Fig. 11. Genitalia of Amphidromus (Syndromus) spp. A–B. Amphidromus areolatus (Pfeiffer, 1861) from Thad Fek, Attapeu, Laos showing the reproductive system and interior structures of the penis and vaginal chamber (CUMZ 7023). C–D. Amphidromus flavus (Pfeiffer, 1861) from Ban Na Deauy, Luang Phrabang, Laos showing the general characteristics of the genital system and the interior structures of the penis, atrium and vagina chamber (CUMZ 7027).

Fig. 12 in Taxonomic review of the tree snail genus Amphidromus Albers, 1850 (Pulmonata: Camaenidae) in Laos, with the description of two new species

Fig. 12. SEM images of the radula. A–C. Amphidromus flavus (Pfeiffer, 1861) from Ban Na Deauy, Luang Phrabang, Laos (CUMZ 7027). D–F. Amphidromus xiengensis Morlet, 1891 from Ban Na Deauy, Luang Phrabang, Laos (CUMZ 7037). G–I. Amphidromus fuscolabris Möllendorff, 1898 from Ban Phone, Sekong, Laos (CUMZ 7041). A, D, G = central tooth with the first to fifth or sixth lateral teeth; B, E, H = lateral teeth with the tricuspid marginal teeth transition; C, F, I = outermost marginal teeth. Numbers indicate the order of the lateral and marginal teeth. Central tooth indicated by 'C'.

Fig. 10 in Taxonomic review of the tree snail genus Amphidromus Albers, 1850 (Pulmonata: Camaenidae) in Laos, with the description of two new species

Fig. 10. Shells of Amphidromus (Syndromus) spp. A−C. Amphidromus areolatus (Pfeiffer, 1861) from Thad Fek, Attapeu, Laos (CUMZ 7022). D. Amphidromus begini (Morlet, 1886), syntype from Strung- Trang, Cambodia (MNHN-IM-2000-1832). E-G. Amphidromus flavus (Pfeiffer, 1861) from Tam Pou Kham, Vientiane, Laos (CUMZ 7029). H. Amphidromus flavus var. "indistinctus" Pilsbry, 1900, holotype (ANSP 31486). I–K. Amphidromus flavus var. "tryoni" Pilsbry, 1900. I. Lectotype (ANSP 31488). J. Paralectotype (ANSP 252745). K. Specimen from Ban Na Deauy, Luang Phrabang, Laos (CUMZ 7026). L–M. Amphidromus semitessellatus (Morlet, 1884). L. Lectotype (MNHN-IM-2000-1985). M. Specimen from Cambodia (NHMUK).

Fig. 3 in Taxonomic review of the tree snail genus Amphidromus Albers, 1850 (Pulmonata: Camaenidae) in Laos, with the description of two new species

Fig. 3. Aestivation sites of Amphidromus species. A–B. Amphidromus roseolabiatus Fulton, 1896 (shell height about 34 mm) from NamTurn Bridge, Bolikhamxay, Laos, aestivated. A. Inside sterile fronds of stag horn ferns, Platycerium Desv. B. In a small hole on a Jackfruit tree trunk, Artocarpus heterophyllus Lam., with other snails, Quantula Baker, 1941 and Durgella Blanford, 1863. C. Amphidromus givenchyi Geret, 1912 (shell height about 43 mm), hiding in a small hole of a dipterocarpus tree shell. D. Amphidromus syndromoideus sp. nov. (shell height about 28 mm) from the type locality, hiding in a hole of a tree, visible after removal of clusters of sterile fronds of the basket fern Drynaria (Bory) J. Sm.

Fig. 2. Living snails. A–B. Amphidromus roseolabiatus Fulton, 1896. A in Taxonomic review of the tree snail genus Amphidromus Albers, 1850 (Pulmonata: Camaenidae) in Laos, with the description of two new species

Fig. 2. Living snails. A–B. Amphidromus roseolabiatus Fulton, 1896. A. Typical form from Ban Phavong, Khammouan, Laos (CUMZ 7012). B. Form with white lip from Tam Mung Korn, Bolikhamxay, Laos (CUMZ 7005). C. Amphidromus givenchyi Geret, 1912 from Thad Lor Waterfall, Salavan, Laos (CUMZ 7018). D. Amphidromus syndromoideus sp. nov., holotype from the type locality (CUMZ 7019).

Fig. 14 in Taxonomic review of the tree snail genus Amphidromus Albers, 1850 (Pulmonata: Camaenidae) in Laos, with the description of two new species

Fig. 14. Genitalia of Amphidromus (Syndromus) spp. A–B. Amphidromus xiengensis Morlet, 1891 from Luang Phrabang showing the reproductive system and interior structures of the penis and vaginal chamber (CUMZ 7035). C–D. Amphidromus fuscolabris Möllendorff, 1898 from Ban Phone, Sekong, Laos showing the general characteristics of the genital system and the interior structures of the penis, atrium and vaginal chamber (CUMZ 7041).

Fig. 9 in Taxonomic review of the tree snail genus Amphidromus Albers, 1850 (Pulmonata: Camaenidae) in Laos, with the description of two new species

Fig. 9. Living snails of Amphidromus (Syndromus) spp. A. Amphidromus areolatus (Pfeiffer, 1861) from Thad Fek, Attapeu, Laos (CUMZ 7023). B. Amphidromus flavus (Pfeiffer, 1861) from Ban Na Deauy, Luang Phrabang, Laos (CUMZ 7027). C–D. Amphidromus xiengensis Morlet, 1891 from Thad Kacham, Luang Phrabang, Laos (CUMZ 7035), the typical form, and var. "multifasciata" Fulton, 1896, respectively. E–F. Amphidromus fuscolabris Möllendorff, 1898 from Ban Phone, Sekong, Laos (CUMZ 7041–7042). E. Typical color form. F. Monochrome yellowish color form.

Fig. 13 in Taxonomic review of the tree snail genus Amphidromus Albers, 1850 (Pulmonata: Camaenidae) in Laos, with the description of two new species

Fig. 13. Shells of Amphidromus (Syndromus) spp. A−C. Amphidromus xiengensis Morlet, 1891. A. Lectotype (MNHN-IM-2000-5249). B. Specimen from Thailand (CUMZ 7050). C. Specimen from Tam Chiang Dao, Chiangmai, Thailand (CUMZ 7034). D−F. Amphidromus xiengensis var. "clausus" Pilsbry, 1900. D. Lectotype (ANSP 31496). E. Specimen from Ban Na Deauy, Luang Phrabang, Laos (CUMZ 7036). F. Specimen from Pha Tang, Prayao, Thailand (CUMZ 7052). G–H. Amphidromus xiengensis var. "multifasciata" Fulton, 1896 from Phu Nang National Park, Phayao, Thailand (CUMZ 7038). I−M. Amphidromus fuscolabris Möllendorff, 1898. I. Holotype (SMF 7641). J−M. Specimens from Ban Phon, Sekong, Laos (CUMZ 7041–7042). N. Amphidromus eudeli Ancey, 1897, syntype from Binh Dinh, Annam (RBINS 617427). O–P. Amphidromus haematostoma Möllendorff, 1898. O. Lectotype (SMF 7559). P. Paralectotype (SMF 7560). Q–R. Amphidromus haematostoma var. "varians" Möllendorff, 1898. Q. Lectotype (SMF 7561). R. Paralectotype (SMF 7562). S–T. Amphidromus xiengkhaungensis sp. nov. S. Holotype (CUMZ 7045). T. Paratype (CUMZ 7046).