Tylopus nodulipes (Attems, 1953)

Likhitrakarn, Natdanai, Golovatch, Sergei I. & Panha, Somsak, 2014, Three new species of the millipede genus Tylopus Jeekel, 1968 from Thailand, with additional notes on the species described by Attems (Diplopoda, Polydesmida, Paradoxosomatidae), ZooKeys 435, pp. 63-91 : 74-77

Taxon classification Animalia Polydesmida Paradoxosomatidae

Tylopus nodulipes (Attems, 1953) Figs 8, 9

Agnesia nodulipes Attems, 1953: 174 (D).

Agnesia nodulipes - Jeekel 1965: 98 (R).

Tylopus nodulipes - Jeekel 1968: 60 (M); Hoffman 1973: 371(M, D); Golovatch 1983: 182 (M); 1984: 69 (M, D); Golovatch and Enghoff 1993: 90 (M, D); Enghoff et al. 2004: 40 (R); Likhitrakarn et al. 2010: 25 (R, D); Nguyen 2012: 301 (R, D).

Lectotype

♂ (here designated) of Agnesia nodulipes (NHMW-3986), Laos, Luang Prabang, 1938-1939, leg. C. Dawydoff.

Lectotype designation proposed herewith is necessary to ensure the species is based on a complete ♂ coming from a certain locality, because (1) Attems (1953) provided no information on the number and sex of syntypes, and (2) he stated their provenance to have been both from Luang Prabang, Laos and Mount Fan-Si-Pan, Lao Cai Province, Vietnam. No paralectotype material could be traced in the Vienna Museum.

Redescription.

Lectotype ca 24 mm long, width of midbody pro- and metazonae 2.1 and 2.9 mm (vs 3.0 in width, as given in the available description ( Attems 1953)). Coloration of alcohol material after long preservation rather uniformly light reddish brown (Fig. 8 A–G) with light yellow antennae, paraterga, epiproct and legs (versus dark maroon with light yellowish brown mid-dorsal parts of prozonae, paraterga a little lighter, antennae light chestnut brown and legs yellow brown, as given in the original description ( Attems 1953)).

Clypeolabral region densely setose; vertex rather smooth, only faintly rugulose; epicranial suture distinct. Antennae rather long and slender (Fig. 8A, B), reaching behind body segment 3 when stretched dorsally. In width, head <segments 3 and 4 <collum <2 <5-16, gently and gradually tapering thereafter. Collum smooth, with three transverse rows of setae, 4+4 anterior, 2+2 intermediate, and 4+4 posterior; caudal corner of paraterga subrectangular, narrowly rounded (Fig. 8A, B), drawn behind rear tergal margin.

Tegument smooth and shining; metaterga rugulose, prozonae finely shagreened, surface below paraterga finely microgranulate. Metaterga 2-17 with two transverse rows of setae: 2+2 in anterior (pre-sulcus) row and 3(2)+3(2) in posterior (post-sulcus) one, setae being borne on very small tubercles growing a little larger laterally, metaterga 18 and 19 with two transverse rows of setae: 2+2 in anterior and 4+4 in posterior row. Tergal setae long, strong, slender, about 1/3 of metatergal length. Axial line visible. Paraterga very strongly developed (Fig. 8 A–G), subhorizontal, lying below dorsum, thin blunt blades in lateral view, a little thicker only on pore-bearing segments, on postcollum segments extending increasingly beyond rear tergal margin, nearly pointed to pointed, caudal tip on paraterga 18-19 clearly curved mesad. Calluses delimited by a sulcus only dorsally, rather narrow. Paraterga 2 broad, slightly upturned, anterior edge rounded, lateral edge with three small incisions in anterior half; posterior edge oblique (Fig. 8A, B). Anterior edge of postcollum metaterga broadly rounded, bordered and fused to callus, lateral edge with two small incisions in anterior half on poreless segments, with only one incision near front 1/3 on pore-bearing ones. Ozopores evident, lateral, lying inside an ovoid groove at about 1/3 of metazonital length. Transverse sulcus complete on metaterga 5-18, incomplete on metatergum 19, rather wide, reaching bases of paraterga, faintly beaded at bottom (Fig. 8A, C, F). Stricture between pro- and metazonae very wide, shallow, faintly beaded at bottom down to base of paraterga. Pleurosternal carinae complete crests only on segment 2 (Fig. 8B), with anteriorly bulged crests and a sharp denticle caudally on segments 3-8, thereafter only a small sharp caudal tooth on segments 9-15, onward missing (Fig. 8B & D). Epiproct (Fig. 8F, G) conical, flattened dorsoventrally, apical papillae evident; tip subtruncate; pre-apical papillae rather large, lying close to tip. Hypoproct (Fig. 8G) roundly subtrapeziform, setigerous knobs at caudal margin evident and well-separated.

Sterna sparsely setose, starting from segment 6 with a small cone caudally near each coxa, rear cones being a little larger than front ones; a rather large, linguiform, densely setose, sternal lobe between ♂ coxae 4 (Fig. 8H, I). Legs moderately long and slender, midbody ones ca 1.2-1.3 times as long as body height, legs of segments 8-18 with an evident adenostyle on each prefemur, postfemur and tibia, with two adenostyles on each femur (Fig. 9C); tarsal brushes present only until ♂ legs 4.

Gonopods (Fig. 9A, B) rather simple; prefemur densely setose, about 1/3 as long as femorite + “postfemoral” part. Femorite stout, expanded distad, slightly curved, showing a mesal groove; lobe l simple; solenophore long and slender, typically coiled, tip subtruncate; process h high, strongly twisted, tip bifid; process m rather long and spiniform, process z knife-shaped.

Remarks.

This is the type species of Tylopus Jeekel, 1968, originally recorded from two localities: Luang Prabang Province, Laos and Mount Fan-Si-Pan, Lao Cai Province, Vietnam ( Attems 1953). Golovatch (1984) redescribed and illustrated only a gonopod, but the locality remained unclear. So the lectotype is herewith selected for the sole type specimen still kept in the Vienna Museum.

This species has recently been reported from Nam Xay Commune (22°05'N, 104°05'E), 1,000 m a.s.l., Van Ban District, Lao Cai Province; Son Tay Commune, 600 m a.s.l., Huong Son District, Ha Tinh Province; and Chem Waterfall, 430 m a.s.l., Pu Mat National Park (18°46'-19°12'N, 104°01'-104°56'E), Nghe An Province, Vietnam ( Nguyen 2012).