The millipede genus Tylopus Jeekel, 1968 (Diplopoda, Polydesmida, Paradoxosomatidae), with a key and descriptions of eight new species from Indochina Author Likhitrakarn, Natdanai 442E2E6E-1CB3-47B2-9896-1A922CE509E1 Division of Plant Protection, Faculty of Agricultural Production, Maejo University, Chiang Mai 50290, Thailand. & Email: kongerrrr @ hotmail. com & urn: lsid: zoobank. org: author: 442 E 2 E 6 E- 1 CB 3 - 47 B 2 - 9896 - 1 A 922 CE 509 E 1 kongerrrr@hotmail.com Author Golovatch, Sergei I. 71532F45-BDD5-415D-BC54-86256E5D5D4A Institute for Problems of Ecology and Evolution, Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia. & Corresponding author: sgolovatch @ yandex. ru & urn: lsid: zoobank. org: author: 71532 F 45 - BDD 5 - 415 D-BC 54 - 86256 E 5 D 5 D 4 A & Corresponding author: sgolovatch @ yandex. ru & Corresponding author: somsak. pan @ chula. ac. th sgolovatch@yandex.ru&sgolovatch@yandex.ru&somsak.pan@chula.ac.th Author Panha, Somsak AC935098-D901-4F35-A414-4B0D4FE44E79 Animal Systematics Research Unit, Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand. & Corresponding author: somsak. pan @ chula. ac. th & urn: lsid: zoobank. org: author: AC 935098 - D 901 - 4 F 35 - A 414 - 4 B 0 D 4 FE 44 E 79 & Corresponding author: sgolovatch @ yandex. ru & Corresponding author: somsak. pan @ chula. ac. th somsak.pan@chula.ac.th&sgolovatch@yandex.ru&somsak.pan@chula.ac.th text European Journal of Taxonomy 2016 2016-05-10 195 1 47 journal article 21966 10.5852/ejt.2016.195 39071d6f-d900-4c81-ace1-dd03875018c5 2118-9773 3837846 4EEA9AD1-5762-4A93-A189-CF185F64CBAF Tylopus acuminatus sp. nov. urn:lsid:zoobank.org:act: C0DB482F-EE58-4385-9733-7D2E724DEFED Figs 12–15 , 26 Diagnosis Very similar to T. jeekeli Golovatch & Enghoff, 1993 and T. parajeekeli Likhitrakarn, Golovatch, Prateepasen & Panha, 2010 , especially in its gonopod conformation, but differs in process h being higher and more strongly flattened, pointed, while the sternal lobe between Ƌ coxae 4 linguiform and larger. Etymology To emphasize the acuminate processes h on the gonopod; adjective. Material examined Holotype LAOS : Ƌ, Ban Sin Chai , Boun Neua , Phongsali , 21°31'50" N , 101°51'45" E , ca 820 m a.s.l. , 15 Oct. 2014 , leg. C. Sutcharit & R . Srisonchai ( CUMZ ). Paratypes LAOS : 1 Ƌ, 1 ♀ , Phuthalang forest protected area, Boun Neua, Phongsali , 21°37'30" N , 101°55'55" E , ca 1125 m a.s.l., 16 Oct. 2014 ( CUMZ ); 1 Ƌ, 2 ♀♀ , Phufa, Boun Neua, Phongsali , 21°41'05" N , 102°06'35" E , ca 1470 m a.s.l, 16 Oct. 2014 ( CUMZ ); 1 ♀ , near Ban Borkhun, Boun Neua, Phongsali , 21°27'57" N , 101°47'20" E , ca 880 m a.s.l., 18 Oct. 2014 ( CUMZ ); 1 ♀ , Khoua, Phongsali , 21°11'55" N , 102°06'40" E , ca 840 m a.s.l., 15 Oct. 2014 ( CUMZ ); 1 Ƌ, 1 ♀ ( NHMW ), 1 Ƌ ( ZMUM ρ3059), Ban Na Thong, Namo, Oudomxay , 20°52'25" N , 101°47'00" E , ca 650 m a.s.l., 14 Oct. 2014 ; 1 Ƌ, Phagneung Phoukulom Waterfall, Sing, Luang Namtha , 21°07'15" N , 101°14'40" E , ca 900 m a.s.l., 13 Oct. 2014 , all leg. C . Sutcharit & R . Srisonchai ( ZMUC ). Description MEASUREMENTS AND COLOUR. Length 24.5–31.6 (Ƌ) or 24.3–31.5 mm ( ♀ ), width of midbody pro- and metazonae 1.98–2.6 and 2.95–3.6 mm (Ƌ) or 2.7–2.9 and 3.1–4.2 mm ( ♀ ), respectively. Live coloration dark brown ( Fig. 12A ); antennae and epiproct light brown; legs yellow-brown. Coloration of alcohol Fig. 12. Tylopus acuminatus sp. nov. , holotype, Ƌ. 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 cones between coxae 4, caudal and sublateral views, respectively. material after one year of preservation faded to brown to yellow-brown; head, antennae, epiproct light brown to yellow-brown, legs and venter yellow-brown to light yellow ( Fig. 12 B–J). HEAD. Clypeolabral region densely, vertex sparsely, setose; epicranial suture distinct. Antennae ( Fig. 12A ) short, surpassing body segment 2 (Ƌ, ♀ ) when stretched dorsally. In width, head <segment 3 <collum <segment 4 <2 <5–16 (Ƌ), or head <segment 3 <4 <collum <segment 2 <5–16 ( ♀ ); thereafter body gently and gradually tapering. Collum with three transverse rows of setae: 4+4 anterior, 1+1 intermediate and 2+2 posterior paraterga declined ventrad, with a small lateral incision at about midway; caudal corner very broadly rounded, not surpassing rear tergal margin ( Fig. 12C ). BODY. Tegument smooth and shining, prozonae finely shagreened, metaterga smooth and leathery ( Fig. 12B, D, F ); surface below paraterga microgranulate ( Fig. 12C, E, H ). Postcollum metaterga with an anterior transverse row of 2+2, mostly abraded setae; posterior row barely traceable as 4+4 insertion points, these being better visible on segments 17–19 ( Fig. 12F ). Tergal setae simple and slender, about 2/3 as long as metaterga. Axial line traceable on prozonae and anterior halves of metazonae. Paraterga well-developed ( Fig. 12 B–F, H), especially so in Ƌ, set rather high (at upper 1/3 of body height), slightly upturned, but lying below dorsum; anterior edge broadly rounded and narrowly bordered, fused to callus; caudal corner very narrowly rounded, drawn behind tergal margin, increasingly protruding and pointed starting with segment 16 ( Fig. 12F, H ). Paraterga 2 with two evident incisions at lateral edge in anterior 1/3. Paraterga 3 and 4 each with two similar incisions at lateral edge, one in anterior 1/3, the other about the middle. Following paraterga each with one evident lateral incision in anterior 1/3 and, in pore-bearing segments, a very small denticle in the middle ( Fig. 12B, D, F ). Calluses on paraterga delimited by a sulcus both dorsally and ventrally. Ozopores evident, lateral, lying in an ovoid groove at about 1/3 of metatergal length in front of posterior edge of metaterga. Transverse sulcus evident on metaterga 5–17, incomplete on metaterga 18, narrow, line-shaped, rather deep, ribbed at bottom, not reaching bases of paraterga ( Fig. 12B, D, F ). Stricture between pro- and metazonae evident, wide and deep, ribbed at bottom down to base of paraterga ( Fig. 12B, D – F ). Pleurosternal carinae complete crests with a sharp caudal tooth on segments 2 and 3 (Ƌ, ♀ ), increasingly reduced and remaining a strong, sharp, caudal tooth on segments 4–8, retained as a small sharp tooth on segments 9–16, a minute tooth on segment 17 (Ƌ), or an evident, sharp, caudal tooth on segments 4–15, then remaining a small rounded tooth on segment 16, thereafter missing ( ♀ ) ( Fig. 12C, E, H ). Epiproct ( Fig. 12 F–H) conical, flattened dorsoventrally, with two evident, rounded, apical papillae; tip subtruncate; lateral pre-apical papillae evident, lying close to tip. Hypoproct ( Fig. 12G ) roundly subtrapeziform, setigerous knobs at caudal edge small and well-separated. Fig. 13. Tylopus acuminatus sp. nov. , holotype, Ƌ, right gonopod. A–B . Lateral and mesal views, respectively. C . Leg 13. Scale bar: A–B. 0.5 mm; C = no scale bar. Abbreviations are explained in the text. Fig. 14. Tylopus acuminatus sp. nov. , holotype, Ƌ, right gonopod. A–B . Mesal and lateral views, respectively. C–F . Distal part, sublateral, submesal, subcaudal and suboral views, respectively. Scale bars = 0.2 mm. STERNA. Moderately setose and densely microtuberculate; cross-impressing shallow; an entire, linguiform, sternal lobe between Ƌ coxae 4 ( Fig. 12I – J ). A paramedian pair of conspicuous ridges in front of gonopod aperture. Legs rather long and slender, midbody ones ca 1.2–1.3 (Ƌ) or 1.0–1.1 ( ♀ ) as long as body height; Ƌ legs with prefemora distinctly swollen laterally, acropodites with particularly dense setae ventrally ( Fig. 13C ), but tarsal brushes absent. Fig. 15. Tylopus acuminatus sp. nov. , paratype, Ƌ, from Phufa ( A–B ), paratype, Ƌ, from Phuthalang forest protected area ( C–D ), paratype, Ƌ, from forest near road ( E ), paratype, Ƌ, from Ban Na Thong ( F ), paratype, Ƌ, from Phagneung Phoukulom waterfall ( G–H ). A–H . Distal part, sublateral, submesal, dorsal, subdorsal, dorsal, subdorsal, ventral and dorsal views, respectively. Scale bars = 0.2 mm. Red colour shows process h. Green colour shows spine z . GONOPOD. Rather simple ( Figs 13A – B , 14 – 15 ); coxa slightly curved caudad, sparsely setose distoventrally. Femorite slightly curved and stout, with an evident mesal groove and a clear distolateral sulcus demarcating a postfemoral part; process h prominent, evidently curved, pointed, with a small, but evident dorsal tooth and sometimes with a small ventral denticle ( Fig. 13A – B ); spine z pointed, sometimes small ( Fig. 15G ); solenophore ( sph ) large, expanded, flattened and typically coiled. Remark This species shows slight variations in gonopod structure, process h often being rather narrow to slightly broader, while spine z small to slightly broader ( Fig. 15 ).