A new species and some new records of millipedes (Diplopoda) from southern Vietnam Author Golovatch, S. I. text Russian Entomological Journal 2024 2024-09-30 33 3 407 413 https://doi.org/10.15298/rusentj.33.3.14 journal article 10.15298/rusentj.33.3.14 0132-8069 14683343 Touranella logunovi sp.n. Figs 4–13 . MATERIAL. Holotype ♂ ( ZISP ), Vietnam , Lam Dong Prov. , Durong Distr. , Bidoup – Nui Ba National Park, near field station, N 12º10′38.47″ , E 108º40′49.28″ , 1450–1500 m a.s.l. , mid-montane mixed tropical forest, 26.X–11.XI.2023 , D. Logunov leg. DIAGNOSIS. Based on the latest review of Touranella Attems, 1937 [ Nguyen et al. , 2023 ], the new species differs readily from all nine hitherto known congeners, including the sympatric T. hirsuta (see above), in the characteristic setation pattern of mostly four transverse rows of usually 5–6+5–6 long setae each on postcollum metaterga, combined with a roundly spatulform process on stalk between ♂ coxae 4, a very short and strong base of the gonopodal femorite supportmg an untwisted solenophore with an acuminate tip and only a little shorter solenomere, both latter similarly slender and strong ( Figs 4–13 ). DESCRIPTION. Length ca 13.5 mm , width of midbody pro- and metazona 0.9 mm and 1.2 mm , respectively ( ♂ ). Colouration dark chocolate brown with contrasting pale ozopore regions, tips of antennae, tergal setae, venter and basal podomeres; paraterga, tip of epiproct, strictures and distal podomeres lighter grey- to yellow-brown; gonopod telopodites yellow ( Figs 4–8 ). Body moniliform, tegument generally smooth and shining, only in places faintly rugulose. Antennae moderately long and slender, slightly clavate, reaching past ring 3 when stretched dorsally; in length, antennomere 3>2=4=5=6>1=7 ( Figs 4–7 ). Head setose nearly throughout, more sparsely so on vertex; epicranial suture faint; genae rounded. Interantennal isthmus ca 1.2 times as broad as diameter of antennal socket ( Figs 6, 7 ). Collum suboval, with four transverse rows of 5–6 setae each side, only fore and caudal rows being regular; paraterga roundly angular caudally and finely rimmed ( Fig. 5 ). In width, head = rings 5–16> 2=4> 3; body gradually and gently tapering caudally on rings 17–19 ( Fig. 4 ). Postcollum paraterga poorly developed, set at about half metatergal height, only a little thicker on pore-bearing rings than on poreless ones, with several indistinct, partly setigerous incisions at lateral margin, poorly delimited both dorsally and especially ventrally, faintly arcuate to nearly straight, on pore-bearing rings mostly drawn caudally into small, blunt to increasingly acute teeth produced past rear tergal margin only on rings 18 and 19. Ozopores visible from above, lying inside oblong grooves a little in front of caudal corners of poriferous paraterga ( Fig. 4 ). Metatergal transverse sulci starting with ring 4, but deep, strongly developed, mostly crescent-shaped, smooth and almost reaching the bases of paraterga on rings 5–18, clearly dividing each metatergum into two halves ( Fig. 4 ). A shallow, but largely evident axial sulcus or line visible on both halves of metaterga 5–19 ( Fig. 4 ). Strictures between pro- and metazona deep and narrow, clearly ribbed dorsally and laterally, smooth ventrally ( Figs 4–7 ). Most of postcollum metaterga with four transverse rows of 5–6 setae in each row, two rows each half and both fore and caudal rows usually being more regular and complete; setae long, ca 1/3 as long as metaterga, pattern clearly traceable at least through insertion points ( Figs 4, 5 ). Limbus thin and entire. Epiproct subtruncate, faintly concave at tip, with small papillae laterally ( Fig. 4 ). Hypoproct subtrapeziform, paramedian setigerous papillae at caudal margin small, but evident ( Fig. 7 ). Pleurosternal carinae small rounded crests visible only on rings 2–4. Figs 1–3. Touranella hirsuta Golovatch, 2009 , ♀ from Bidoup – Nui Ba National Park, habitus, dorsal, lateral and ventral views, respectively. Photographs by K.V. Makarov, not taken to scale. Рис. 1–3. Touranella hirsuta Golovatch, 2009 , ♀ иЗ национального парка Bidoup – Nui Ba, обЩий вид, соответственно сверху, сбоку и сниЗу. Фотографии К.В. Макарова, снЯто беЗ масштаба. Figs 4–8. Touranella logunovi sp.n . , ♂ holotype from Bidoup – Nui Ba National Park. 4–6 — habitus in dorsal, lateral and ventral views, respectively; 7 — anterior half of body, ventral view; 8 — caudal part of body, ventral view. Photographs by K.V. Makarov, not taken to scale. Рис. 4–8. Touranella logunovi sp.n . , голотип ♂ иЗ национального парка Bidoup – Nui Ba, 4–6 — обЩий вид, соответственно сверху, сбоку и сниЗу; 7 — переднЯЯ половина тела, сниЗу; 8 — ЗаднЯЯ часть тела, сниЗу. Фотографии К.В. Макарова, снЯто беЗ масштаба. Sterna with faint cross-impressions, sparsely setose, without modifications except for a conspicuous, long, apically rounded,setose process on stalk between coxae 4 ( ♂ ) ( Figs 6, 7 ). Legs very long and slender, densely setose, but devoid of tarsal brushes, about 2.5–3.0 times as long as midbody height, prefemora not swollen laterally ( Figs 5–7 ); only each femur 1 with a distinct, curved, rounded, ventro-parabasal adenostyle ( ♂ ); gonopores inconspicuous. In length, femora = tarsi> prefemora = postfemora = tibiae> coxae. Gonopods ( Figs 9–13 ) rather simple. Coxite ( cx ) subcylindrical, only slightly shorter than telopodite, with a distomesal cannula as usual. Prefemorite ( prf ) short, densely setose as usual. Femorite ( fe ) very strongly reduced, without process. Postfemoral region particularly long, slender, suberect and only slightly twisted, consisting of a rod-shaped solenomere ( sl ) and a slightly longer solenophore ( sph ), the latter acuminate on top and distally sheathing much of sl . Figs 9–11. Touranella logunovi sp.n . , ♂ holotype from Bidoup – Nui Ba National Park, left gonopod, dorsolateral, dorsal and mesal views, respectively. Photographs by K.V. Makarov, not taken to scale. Рис. 9–11. Touranella logunovi sp.n . , голотип ♂ иЗ национального парка Bidoup – Nui Ba, левый гонопод, соответственно сверху и сбоку, сверху и иЗнутри. Фотографии К.В. Макарова, снЯто беЗ масштаба. REMARKS. Sympatry among Touranella species is noteworthy. Thus, the Bidoup – Nui Ba National Park in southern Vietnam appears to support as many as three Touranella species : T. peculiaris Golovatch, 2009 , T. hirsuta Golovatch, 2009 , and T. logunovi sp.n. , while the Cat Tien National Park, also in southern Vietnam , harbours T. moniliformis Golovatch et Semenyuk, 2018 and T. cattiensis Golovatch et Semenyuk, 2010 (see Nguyen et al. [2023] ).