Nepalmatoiulus weixi, Mikhaljova, 2020

Mikhaljova, Elena V., 2020, New data on the fauna of China, part I: the taxonomy of the millipede family Julidae (Diplopoda), Zootaxa 4729 (1), pp. 47-66 : 59-61

Nepalmatoiulus weixi new species

Figs 59–67

Material examined: Holotype: male ( ZMUM), China, Yunnan Province, N Weixi City, 2.95 km NW Xugongqingshangcun , 27°39´20´´ N, 99°20´55´´ E, H = 3080 m asl., 21.06.2015, leg. I. Belousov, I. Kabak, G. Davidian. Paratypes: 2 females ( ZMUM), same locality as in holotype, 21.06 2015, leg. I. Belousov, I. Kabak, G. Davidian ; 1 male ( ZMUM), China, Yunnan Province, SE Weixi City, 3.9 km SW Shanghuoshan Vil. , 27°40´58´´ N, 99°17´41´´ E, H = 3070 m asl., 18.06.2015, leg. I. Belousov, I. Kabak, G. Davidian.

Diagnosis. Differs from congeners mainly by the relatively short, moderately stout setose gonopod solenomere in couple with dentiform mesomeral process and sharply curved smooth apical margin of velum.

Description. Male holotype. Length 26–27 mm, vertical diameter about 1.0 mm, with 48 (–3), 48(–1) rings, excluding telson. Coloration in alcohol marbled brown with broad longitudinal light brown dorsal strip. Axial suture dark brown. Venter including basal parts of legs light brown. Distal parts of legs marbled brown. Collum with two large, transversely-oval, marbled brown spots. Head marbled brown excluding light brown anterior and ventral parts as well as dark brown strip between eyes. Antennae brown, eyes black. Head smooth, several setae on each lateral side (below of antenna), 2 epicranial setae, 4 supralabral setae, 22 labral setae. Eye patches almost oval, composed of about 40 ocelli. Antennae medium-sized, rather slender and clavate; length and width ratios of the antennomeres as in the majority of Nepalmatoiulus . Gnathochilarium with not less than 10 nonapical stipital setae. Mandibular stipite with subrectangular rounded smooth lobe; the lobe apical portion with well demarcated border; not less than 5 setae on each lamella linguales. Collum laterally with distinct lower striae of different length (one stria extending far forwards) at posterior margin not reaching to anterior margin, dorsally with distinct more short striae at posterior margin only. Length of the collum striae gradually decreasing toward dorsum. A transverse row of sparse setae at hind edge of collum. Body rings circular. Prozona smooth. Metazona with dense, regular, longitudinal striae reach- ing hind margin (11–12 striae in an approximate square with sides equal to metazonital length of a dorsal side of midbody ring). Limbus straight, smooth (of Type 1 in Enghoff 1987). A transverse row of thin setae at hind edge of metazonites, setae gradually growing denser toward telson. Ozopores small, lying behind suture dividing pro- and metazona, set off from the suture. Telson with caudal dorsal projection long, covered with setae and carrying at tip a claw-shaped small process directed caudad. Preanal ring setose, anal valves, and subanal scale densely setose. Legs relatively short and slender. Very delicately serrate ventral pads present on postfemur and tibia, starting from legs 2. Claw of all legs at base with a relatively long (longer than claw) setiform accessory claw ventrally but without accessory claw dorsally. Leg pair 1 forming hook, the distal ring not coming into close contact with the basal rings (“open hook” type in Enghoff 1987); postfemur with inflated scaly-rugose ventral surface, tip indistinctly wrinkled, coxa with one seta, distal ring without seta, with low tarsal remnant ( Fig. 59 ). Coxa 2 with one mesapical oral setae, gland opening positioned in apical and axial position ( Fig. 60 ) according to Enghoff (1987). Penis subtrapezoidal, about 1.3 times longer than wide, with apical excavation ( Fig. 61 ). Ventral margin of body ring VII with ventrad apically rounded lobes. Gonopods slightly protruding. Anterior gonopod flattened, with parallel margins, apically obliquely rounded, in posterior view apically excavated for accommodation of mesomeral process, distal margins of the excavation papillate, subcentrally with knoblike flattened rudimentary telopodite ( Figs 62–63 ). Flagellum slen- der, of medium length, covered with cuticular conical obtuse denticles in the distal part ( Fig. 65 ); basal part of the flagellum caudally covered with cuticular spikes ( Fig. 66 ). Opisthomere with dentiform mesomeral process, its apex devoid of papillae; margin of velum arcuate, smooth; additional membrane with a serrate edge ( Fig. 64 ). Solenomere densely spinose throughout (apex of a flagellum (f )) is visible in Fig. 64 ).

Female. Length 28–29 mm, vertical diameter about 2.5 mm, with 49 (–1), 50(–2) rings, excluding telson. Vulva as in Fig. 67 ; apical lobes of bursa well developed, posterior median plate with a little more than 10 setae arranged more or less regularly.

Etymology: The specific epithet refers to the type locality, a noun in apposition.

Figures

FIGURES 59–67. Nepalmatoiulus weixi sp. nov., male and female paratypes. 59, leg 1, front view; 60, coxae 2, front view; 61, penis, front view; 62, promere, caudal view; 63, apex of promere, caudal view; 64, opisthomere, mesal view; 65, distal part of promere flagellum; 66, basal part of promere flagellum; 67, vulva, caudal view; f, flagellum apex. Male: Figs 59–66. Scales: 10 μm (Fig. 65–66), 20 μm (Figs 59, 61, 63), 100 μm (Figs 60, 62, 64, 67).