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Fig. 9. A–E in A revision of dragon millipedes III: the new genus Gigaxytes gen. nov., with the description of three new species (Diplopoda, Polydesmida, Paradoxosomatidae)

Fig. 9. A–E. Photographs of live Gigaxytes gigas (Golovatch & Enghoff, 1994) gen. et comb. nov. A. ♂, specimen from Wat Tham Sue (Tiger Cave). B. ♂, specimen from Wat Tham Phra Phut. C. Parasitic?Leptus mites on ♂. D. ♀, specimen from Wat Tham Sue (Tiger Cave). E. Juvenile. F. Habitat.

Fig. 8 in A revision of dragon millipedes III: the new genus Gigaxytes gen. nov., with the description of three new species (Diplopoda, Polydesmida, Paradoxosomatidae)

Fig. 8. Gigaxytes fusca Srisonchai, Enghoff & Panha gen. et sp. nov., ³ paratype – right gonopod. A. Lateral view. B. Mesal view. C. Ventral view. D, F. Subdorsal view. E. Dorsal view.

Fig. 6 in A revision of dragon millipedes III: the new genus Gigaxytes gen. nov., with the description of three new species (Diplopoda, Polydesmida, Paradoxosomatidae)

Fig. 6. Gigaxytes fusca Srisonchai, Enghoff & Panha gen. et sp. nov., ³ paratype. A. Body rings 8–10. B. Paraterga of ring 10 (arrowhead points to ozopore). C–D. Last ring and telson. E. Hypoproct. F–G. Epiproct. H–J. Sternal lobe between coxae 4.

Fig. 5 in A revision of dragon millipedes III: the new genus Gigaxytes gen. nov., with the description of three new species (Diplopoda, Polydesmida, Paradoxosomatidae)

Fig. 5. Gigaxytes fusca Srisonchai, Enghoff & Panha gen. et sp. nov., ³ paratype. A. Anterior body part. B. Body rings 8–10. C. Posteriormost body rings and telson. D. Head and antenna. E. ♂ leg 5 (right). F. ♂ leg 6 (right). G. ♂ leg 13 (right). H. Midbody ring.

Fig. 23 in A revision of dragon millipedes III: the new genus Gigaxytes gen. nov., with the description of three new species (Diplopoda, Polydesmida, Paradoxosomatidae)

Fig. 23. Gigaxytes suratensis Srisonchai, Enghoff & Panha gen. et sp. nov., ³, paratype – right gonopod. A. Lateral view. B. Mesal view. C. Ventral view. D, F. Subdorsal view. E. Dorsal view.

Fig. 16 in A revision of dragon millipedes III: the new genus Gigaxytes gen. nov., with the description of three new species (Diplopoda, Polydesmida, Paradoxosomatidae)

Fig. 16. Gigaxytes parvoterga Srisonchai, Enghoff & Panha gen. et sp. nov., ³ paratype. A. Body rings 8–10. B. Paraterga of ring 10 (arrowhead points to ozopore). C–D. Last ring and telson. E. Hypoproct. F–G. Epiproct. H–J. Sternal lobe between coxae 4.

Fig. 4. A–C in A revision of dragon millipedes III: the new genus Gigaxytes gen. nov., with the description of three new species (Diplopoda, Polydesmida, Paradoxosomatidae)

Fig. 4. A–C. Photographs of live Gigaxytes fusca Srisonchai, Enghoff & Panha gen. et sp. nov. A. ♂ paratype, specimen from Phitsadarn Cave. B. ♂ paratype, specimen from Phrayarhtan Cave (Buddha Cave). C. ♀ paratype, specimen from Phitsadarn Cave. D–E. Phoretic histiostomatid mites. F. Habitat.

Fig. 7 in A revision of dragon millipedes III: the new genus Gigaxytes gen. nov., with the description of three new species (Diplopoda, Polydesmida, Paradoxosomatidae)

Fig. 7. Gigaxytes fusca Srisonchai, Enghoff & Panha gen. et sp. nov., ³ paratype – right gonopod. A. Mesal view. B. Lateral view. C. Ventral view. D. Dorsal view (arrowead points to sharp tip of lamina medialis).

Fig. 2 in A revision of dragon millipedes III: the new genus Gigaxytes gen. nov., with the description of three new species (Diplopoda, Polydesmida, Paradoxosomatidae)

Fig. 2. General body characters of Gigaxytes gen. nov. (G. fusca Srisonchai, Enghoff & Panha gen. et sp. nov., ♂ paratype) – SEM images. A–B. Anterior body part (arrowheads point to pleurosternal carinae). C. Collum. D. Body rings 9–10. E. Body rings 8–10. F. Telson. G. Posteriormost rings and telson. H. Body ring 10. I. Mouthparts, ventral view. J. ♂ leg 13. K. Sternal lobe between ♂ coxae 4. L, N. Tip of epiproct. M. Tip of tarsus and claw of leg 13.

Fig. 3 in A revision of dragon millipedes III: the new genus Gigaxytes gen. nov., with the description of three new species (Diplopoda, Polydesmida, Paradoxosomatidae)

Fig. 3. SEM images of right gonopod of Gigaxytes Srisonchai, Enghoff & Panha gen. nov. – Gigaxytes gigas (Golovatch & Enghoff, 1994) gen. et comb. nov., ³, specimen from Wat Tham Sue (Tiger Cave). A. Lateral view. B. Mesal view. C. Dorsal view. D. Ventral view. Colours: red = lamina medialis, yellow = solenomere, green = lamina lateralis, purple = seminal groove.

Fig. 1 in A revision of dragon millipedes III: the new genus Gigaxytes gen. nov., with the description of three new species (Diplopoda, Polydesmida, Paradoxosomatidae)

Fig. 1. Gigaxytes fusca Srisonchai, Enghoff & Panha gen. et sp. nov., ♂ paratype. Watercolour by Photchana Kriatpraprai.

Fig. 22 in A revision of dragon millipedes III: the new genus Gigaxytes gen. nov., with the description of three new species (Diplopoda, Polydesmida, Paradoxosomatidae)

Fig. 22. Gigaxytes suratensis Srisonchai, Enghoff & Panha gen. et sp. nov., ³ paratype – right gonopod. A. Mesal view. B. Lateral view. C. Ventral view. D. Dorsal view.

Fig. 24 in A revision of dragon millipedes III: the new genus Gigaxytes gen. nov., with the description of three new species (Diplopoda, Polydesmida, Paradoxosomatidae)

Fig. 24. Known distribution of all Gigaxytes gen. nov. species (black symbol = type locality, white symbol = other localities).

Fig. 21 in A revision of dragon millipedes III: the new genus Gigaxytes gen. nov., with the description of three new species (Diplopoda, Polydesmida, Paradoxosomatidae)

Fig. 21. Gigaxytes suratensis Srisonchai, Enghoff & Panha gen. et sp. nov., ³ paratype. A. Body rings 8–10. B. Paraterga of ring 10 (arrowhead points to ozopore). C–D. Last ring and telson. E. Hypoproct. F–G. Epiproct. H–J. Sternal lobe between coxae 4.

Fig. 19. A–E in A revision of dragon millipedes III: the new genus Gigaxytes gen. nov., with the description of three new species (Diplopoda, Polydesmida, Paradoxosomatidae)

Fig. 19. A–E. Photographs of live Gigaxytes suratensis Srisonchai, Enghoff & Panha gen. et sp. nov. A. ♂ paratype, specimen from Ban Song Phi Nong. B. ♂, specimen from Wat Satit Khirirom. C. ♀ paratype, specimen from Ban Song Phi Nong. D. Mating couple (paratypes). E. Juvenile. F. Habitat.

Fig. 18 in A revision of dragon millipedes III: the new genus Gigaxytes gen. nov., with the description of three new species (Diplopoda, Polydesmida, Paradoxosomatidae)

Fig. 18. Gigaxytes parvoterga Srisonchai, Enghoff & Panha gen. et sp. nov., ³ paratype – right gonopod. A. Lateral view. B. Mesal view. C. Ventral view. D, F. Subdorsal view. E. Dorsal view.

Fig. 6 in Middle Ordovician Drepanoistodus (Vertebrata, Conodonta) from Baltica, with description of three new species

Fig. 6. Light microscopy photographs of selected geniculate elements of species of Drepanoistodus, as outlined herein, from the Lynna River section, Russia. A–D. Drepanoistodus basiovalis (Sergeeva, 1963). A. LO 12476t, inner view, sample LY12-16, L. variabilis Zone. B. Same specimen as A in outer view. C. LO 12477t, inner view, sample LY12-9,L. antivariabilis Zone. D. LO 12478t, inner view, sample LY12-21b, L. variabilis Zone. E–H. Drepanoistodus iommii sp. nov. E. LO 12479T, holotype, inner view, sample LY12-16, L. variabilis Zone. F. Same specimen as E in outer view. G. LO 12480t, inner view, sample LY12-21b, L. variabilis Zone. H. LO 12481t, inner view, sample LY12-3, L. antivariabilis Zone. I–L. Drepanoistodus svendi sp. nov. I. LO 12482t, inner view, sample LY12-13, L. variabilis Zone. J–K. LO 12483T, holotype, inner and outer view, respectively, sample LY12-14, L. variabilis

Fig. 4 in Middle Ordovician Drepanoistodus (Vertebrata, Conodonta) from Baltica, with description of three new species

Fig. 4. Principal Component Analysis (PCA) biplot based on the correlation coefficient showing the position of conodont specimens (abbreviated names, see Table 1) and morphological characters/variables. The latter is represented by blue vector lines (see Table 2), the direction and length of which mark the relative importance of the various characters/variables. Each coloured field marks the position of a selected species grouping. Whereas 18.4% of the total variance is visible along the PC 1 axis, 16.1% is seen along the PC 2 axis. See main text for further explanation on the analyses performed, and consult Table 1 for data on sample numbers.

Fig. 3 in Middle Ordovician Drepanoistodus (Vertebrata, Conodonta) from Baltica, with description of three new species

Fig. 3. Geniculate Drepanoistodus basiovalis (Sergeeva, 1963) element demonstrating the essential morphological characteristics utilized in the present study. Two characters were measured quantitatively: Angle A between the median line (usually carina) of the cusp and the lower margin of the keel situated on the upper margin of the cusp (A); and the b/c ratio, which is the ratio between the length of the upper margin of the base (b) and the length of the free cusp (c).

Fig. 2 in Middle Ordovician Drepanoistodus (Vertebrata, Conodonta) from Baltica, with description of three new species

Fig. 2. The Middle Ordovician stratigraphy of the St. Petersburg region with Baltoscandian and global stratigraphy for comparison (modified from Lindskog et al. 2020, and references therein; additions after Pärnaste et al. 2013; Bauert et al. 2014; Gradstein et al. 2020). The pink area indicates the approximate stratigraphic range of the outcrop at the Lynna River, with ranges of selected Drepanoistodus species indicated. For more detailed information on the local conodont biostratigraphy and ranges of individual species, see Lindskog et al. (2020: fig. 6).