Orthomorpha sericata

Likhitrakarn, Natdanai, Golovatch, Sergei I. & Panha, Somsak, 2010, The millipede genus Orthomorpha Bollman, 1893 in Thailand. 1. Revision of the sericata - group, with descriptions of four new species (Diplopoda, Polydesmida, Paradoxosomatidae), Zootaxa 2361, pp. 23-45 : 45

Key to species of the sericata -group

1. At least surface of metaterga leathery, dull.................................................................................................................. 2.

- Dorsal surface shining ................................................................................................................................................ 4.

2. Only caudal parts of paraterga contrastingly light ( Figs 14 A–G, J–L). Paraterga less strongly developed, narrower, with only a small incision at best in front 1/3 extent ( Figs 14 A, C, E, J & L). No tergal setae borne on evident knobs/ tubercles ....................................................................................................................................................... O. sericata

- Entire paraterga contrastingly light, much broader, largely with an evident, dentiform incision in front 1/3 extent ( Figs 1 B, D & K, 7B & D). At least some tergal setae borne on evident knobs/tubercles .......................................... 3.

3. Surface of metaterga rough, microgranulate and rugulose ( Figs 1 B–H, K–M). Metatergal setigerous tubercles higher, present also on collum. Paratergal incisions especially prominent ( Figs 1 B–E, K & L). ....... O. enghoffi sp. n.

- Surface of metaterga nearly smooth, microgranulate ( Figs 7 B–H). Metatergal setigerous tubercles evidently smaller, absent from collum. Paratergal incisions evident, but not so prominent ( Figs 7 B & D) .................... O. alutaria sp. n.

4. Adults> 30 mm long and> 4 mm wide. Collum broadly rounded laterally ( Figs 12 B & C). Paraterga set high, at least some upturned above dorsum. Sternal cones between male coxae 4 isolated ( Figs 12 I & J). ............................... ..................................................................................................................................................... O. parasericata sp. n.

- Adults <30 mm long and <4 mm wide. Collum narrowly rounded to angulate laterally ( Figs 5 B &C, 9B & C). Paraterga set high, but remaining below dorsum even in male. Sternal cones between male coxae 4 fused basally into a single lamina ( Figs 5 I & J, 9I & J)............................................................................................................................ 5.

5. Bases of paraterga more broadly light ( Figs 5 A–H). Legs shorter, about 1.2 (male) or 1.0 times (female) as long as midbody height. Tip of solenophore like an elongate and undulate lobe ( Figs 3 C & D, 6) ................... O. subsericata

- Bases of paraterga more narrowly light ( Figs 9 A–H). Legs longer, about 1.5 (male) or 1.2–1.3 times (female) as long as midbody height. Tip of solenophore tridentate ( Figs 10 , 11 A & B). .............................................. O. asticta sp. n.

Figures

FIGURE 1. Orthomorpha enghoffi sp. n., male holotype (A) and paratype (B – J), and O. enghoffi sp. n., variety from Huay E Loet, male (K – M). A: habitus, live coloration. B & C: anterior part of body, dorsal and lateral views, respectively. D, E, K & L: segments 10 and 11, dorsal, lateral, dorsal and lateral views, respectively. F – H & M: posterior part of body, dorsal, ventral, lateral and dorsal views, respectively. I & J: sternal cones between coxae 4, subcaudal and sublateral views, respectively.

FIGURE 3. Orthomorpha enghoffi sp. n., holotype (A & B), O. subsericata Golovatch, 1997, male from Kholong Wan (C & D), and O. alutaria sp. n., male paratype from Khao Wong Phrachan Temple (E & F). A – F: right gonopod, mesal, lateral, mesal, lateral, mesal and lateral views, respectively. Scale bar: 0.5 mm.

FIGURE 5. Orthomorpha subsericata Golovatch, 1997, male from Kholong Wan. A: habitus, live coloration. B & C: anterior part of body, dorsal and lateral views, respectively. D & E: segments 10 and 11, dorsal and lateral views, respectively. F – H: posterior part of body, dorsal, ventral and lateral views, respectively. I & J: sternal lamina between coxae 4, subcaudal and sublateral views, respectively.

FIGURE 7. Orthomorpha alutaria sp. n., female paratype from Tham Khao Wong Temple (A) and male paratype from Khao Wong Phrachan Temple (B – J). A: habitus, live coloration. B & C: anterior part of body, dorsal and lateral views, respectively. D & E: segments 10 and 11, dorsal and lateral views, respectively. F – H: posterior part of body, dorsal, ventral and lateral views, respectively. I & J: sternal lamina between coxae 4, subcaudal and sublateral views, respectively.

FIGURE 9. Orthomorpha asticta sp. n., male paratype from Mt Kaki Bukit. A: habitus, live coloration. B & C: anterior part of body, dorsal and lateral views, respectively. D & E: segments 10 and 11, dorsal and lateral views, respectively. F – H: posterior part of body, dorsal, ventral and lateral views, respectively. I & J: sternal lamina between coxae 4, subcaudal and sublateral views, respectively.

FIGURE 10. Orthomorpha asticta sp. n., male paratype from Mt Kaki Bukit. A & B: right gonopod, mesal and lateral views, respectively. C – F: distal part of right gonopod, mesal, lateral, dorsal and suboral views, respectively. Scale bar: 0.1 mm.

FIGURE 11. Orthomorpha asticta sp. n., male paratype from Mt Kaki Bukit (A & B) and O. parasericata sp. n., holotype (C & D). A – F: right gonopod, mesal, lateral, mesal and lateral views, respectively. Scale bar: 0.5 mm.

FIGURE 12. Orthomorpha parasericata sp. n., male paratype. A: habitus, live coloration (photographed not to scale). B & C: anterior part of body, dorsal and lateral views, respectively. D & E: segments 10 and 11, dorsal and lateral views, respectively. F – H: posterior part of body, dorsal, ventral and lateral views, respectively. I & J: sternal cones between coxae 4, subcaudal and sublateral views, respectively.

FIGURE 14. Orthomorpha sericata Jeekel, 1964, male (A – I) and female (J – L) paratypes. A & B: anterior part of body, dorsal and lateral views, respectively. C, D, J & K: segments 10 and 11, dorsal, lateral, dorsal and lateral views, respectively. E – G & L: posterior part of body, dorsal, ventral, lateral and dorsal views, respectively. H & I: sternal cones between coxae 4, subcaudal and sublateral views, respectively.