Review of the millipede genus Eutrichodesmus Silvestri, 1910, in China, with descriptions of new cavernicolous species (Diplopoda, Polydesmida, Haplodesmidae) Author Golovatch, Sergei I. Author Geoffroy, Jean-Jacques Author Mauries, Jean-Paul Author VandenSpiegel, Didier text ZooKeys 2015 505 1 34 http://dx.doi.org/10.3897/zookeys.505.9862 journal article http://dx.doi.org/10.3897/zookeys.505.9862 1313-2970-505-1 7F1C641D389940BD8E9B1F812D4509D1 7F1C641D389940BD8E9B1F812D4509D1 Taxon classification Animalia Polydesmida Haplodesmidae Eutrichodesmus lipsae Golovatch, Geoffroy, Mauries & VandenSpiegel sp. n. Figs 3, 4 Type material. Holotype ♂ (MNHN JC 368), China, Guangxi Prov., Guilin County, Grotte des Squelettes, 22.VII.1992, leg. J. Lips (No. B1-2). Paratypes: 1 ♂ (SEM), 1 juv. (MNHN JC 368), same data, together with holotype. Name. In honour of Josiane Lips, the collector. Diagnosis. Differs from congeners by clearly elevated mid-dorsal regions of most metaterga, coupled with a slender, suberect gonopod telopodite which shows a rather narrowly gapped apical pincer (see also Key below). Description. Length of adults ca 7.0 mm, width 1.0 and 1.95 mm on midbody pro- and metazonae, respectively (♂). Coloration entirely pallid. All characters as in Eutrichodesmus triangularis sp. n., except as follows. Body with 20 segments (♂) (Fig. 3A), conglobation pattern typical of "doratodesmoids" , volvation apparently being complete because of strongly declivous and relatively narrow paraterga. Antennae short and clavate (Fig. 3I). Collum not covering the head from above, fore margin clearly lobulate, with 4-5 transverse rows of very flat tuberculations/bosses. Metaterga behind collum with three transverse, rather irregular, mixostictic rows of similarly flat, rounded, often obliterate, obviously setigerous bosses extending onto paraterga, usually about 9-10+9-10 per row (Fig. 3 A-G ); starting with segment 3, middle and caudal rows clearly enlarged and elevated mid-dorsad, increasingly clearly so towards segment 15 or 16 as well (Fig. 3 A-G ); caudomarginal lobulations evident across dorsum; limbus microcrenulate. Paraterga with evident shoulders anteriorly, strongly declivous, directed ventrolaterad at about 45° to only slightly less strongly declined sides above paraterga, broad, tips lying clearly below level of venter, usually vaguely bilobate laterally, without anterolaterals, but with well-developed rounded caudolaterals at and above base (Fig. 3 A-D , L). Paraterga 2 strongly enlarged, directed ventrad (Fig. 3A, B, I), lateral margin broadly rounded, with numerous, very small lobulations, caudal margin with a row of lobules extending across dorsum, both schism and hyposchism small. Tergal setae very short, 2-segmented, apical part phylloid (Fig. 3M). Pore formula normal, ozopores indistinct, located dorsally at about anterior 1/3 of paratergite and well removed from lateral margin (Fig. 3L). Hypoproct subtrapeziform (Fig. 3K). Figure 3. Eutrichodesmus lipsae sp. n., ♂ paratype; A habitus, lateral view B, E, I anterior part of body, lateral, dorsal and ventral views, respectively C, F, J midbody segments, lateral, dorsal and ventral views, respectively D, G, K posterior part of body, lateral, dorsal and ventral views, respectively H cross-section of a midbody segment, caudal view L poriferous midbody paratergite, lateral view M tergal seta, subdorsal view N both gonopods in situ, ventral view O, P right gonopod, mesal and ventromesal views, respectively Q tip of right gonopod, subventral view. Scale bars: 0.5 mm (A, E-G , I), 0.2 mm ( B-D , H, J, K), 0.1 mm ( N-P ), 0.05 mm (L), 0.02 mm (Q), 0.002 mm (M). Sterna usually with a rather deep, narrow depression between coxae (Fig. 3I, J). Legs long and slender, about 1.1-1.2 times as long as body height. Gonopods (Figs 3N-Q, 4) simple. Coxae subquadrate, large, micropapillate, but not setose, with only a small round lobe caudolaterally. Telopodite considerably longer than coxite, slender, suberect, setose over its basal 2/3 until base of a prominent, finger-shaped, poorly papillate, distofemoral process (dp), the latter situated in distal 1/4 of telopodite, more distally with a rather narrow, twisted, subacuminate, slightly longer acropodite forming a rather narrowly gapped pincer together with dp and showing a short, distoventral, subapical spine (s) and a small, distodorsal, subapical tooth (t); seminal groove terminating at base of s, devoid of a hairpad. Figure 4. Eutrichodesmus lipsae sp. n., ♂ holotype; A, B right gonopod, mesal and lateral views, respectively. Scale bar: 0.2 mm. Remark. More information on the location of the cave can be found at http://www.groupe-speleo-vulcain.com/explorations/expeditions-a-letranger/