Eutrichodesmus incisus Golovatch, Geoffroy, Mauriès & VandenSpiegel, 2009

Golovatch, Sergei, Geoffroy, Jean-Jacques, Mauriès, Jean-Paul & VandenSpiegel, Didier, 2009, Review of the millipede family Haplodesmidae Cook, 1895, with descriptions of some new or poorly-known species (Diplopoda, Polydesmida), ZooKeys 7 (7), pp. 1-53 : 30-36

Eutrichodesmus incisus Golovatch, Geoffroy, Mauriès & VandenSpiegel , sp. n.

urn:lsid:zoobank.org:act:4AF07ABA-62FA-4753-A991-B39D2E44146F

Figs 22-26 .

Type material. China, Guizhou Prov., Qianxi County, Hong Lin Village, Tiao Shuz Dong Cave , 18.XI.2003, leg. L. Latella & G. Rossi, holotype ♂ ( MNHN JC 314 ), paratypes: 1 ♂, 1 juv. ( MNHN JC 314 ), 1 ♀ ( SEM) ; same locality and cave, 18.XI.2003, leg. L. Latella, D. Avesani & G. Rossi, 1 ♂, 5 ♀♀, 1 juv. ( MNHN JC 314 ), 2 ♀♀ ( SCAU) ; same locality, Liao Jing Ling Dong Cave , 16.XI. 2001, leg. L. Latella, 1 ♂, 1 ♀, 1 juv. ( MCSNV), 1 ♀ ( IZAS), 1 ♀ ( ZMUM), 1 ♀ ( ZMUC), 1 ♀ ( MNHN JC 314 ), 1 ♂ ( SEM) ; same locality, Shu Jia Yan Dong Cave , 16. XI.2001, leg. L. Latella & Berzacola, 1 ♀ ( MNHN JC 314 ) ; same locality, Da Kong Dong Cave , 12. XI.2003, leg. L. Latella, 1 ♀ ( MNHN JC 314 ) ; same locality, Luo Sai Dong Cave , 19. XI. 2001, leg. D. Avesani, L. Latella & S. Meggiorini, 1 ♀ ( MNHN JC 314 ) .

Name. To emphasize the deeply incised caudolateral lobulations on most metaterga.

Diagnosis. Differs from all congeners by the unusually deeply incised caudolateral and lateral lobulations on most of the metaterga, as well as the peculiar, biramous, multituberculate, midway, lateral process (dp) of the gonopod telopodite.

Description. Length of adults of both sexes ca 7-8 mm, width 1.1-1.2 mm, body broadest at segments 3 and 4. Holotype ca 7 mm long and 1.2 mm wide. Coloration rather uniformly whitish to light yellow, anterior body parts often a little infuscate, light yellow-brownish.

Adults with 20 segments ( Fig. 22A ), conglobation pattern typical of “ Doratodesmidae ”, complete. Head ( Fig. 23B ) basically as in preceding species, but tegument slightly rougher ( Figs 24A, B , D-F), antennae somewhat shorter ( Fig. 23B ), collum not covering head from above, regularly convex, with four rows of high, conical tubercles ( Figs 22B, E ). Metaterga behind collum with three transverse, rather regular rows of similarly high tubercles, most of which still retain very short, bisegmented setae ( Fig. 22 ; 24E, F ); limbus microcrenulate. Paraterga mostly directed ventrolaterad, strongly declivous, narrow, tips clearly surpassing the level of venter, unusually distinctly crenulate/lobulate laterally and caudolaterally, usually with characteristic, deep incisions between lobules ( Figs 22 ; 23E, F ); paraterga 2 strongly enlarged, subvertical, anterolateral and lateral margins both evidently trilobate, caudal margin above schism with 4-5 similarly evident lobules, both schism and hyposchism small; paraterga 3 and 4 slightly shorter than others, bilobate laterally ( Fig. 22B ), following paraterga broadly rounded and mostly evidently trilobate, overlap typical. Pore formula normal, ozopores located near base of ventrocaudal lobulation ( Fig. 23F ). Pleurotergal carinae wanting. Epiproct strongly flattened, dorsally also tuberculate, with several deep incisions at lateral edge, directed ventrocaudad, with the usual four cones just below tip; para- and hypoprocts as in Figs 23A, D .

Sterna usually with a rather deep, narrow depression between coxae ( Fig. 24C ), only those between coxae 6, 7 and 9 much wider ( Fig. 25A ). Gonopod aperture transverse-oval, relatively small, far from reaching lateral sides of segment 7. Legs rather short; femoral and tarsal segments equal and longest; several basal segments microtuberculate; claw simple, slightly curved ventrad; some setae very sparsely microdenticulate ( Fig. 24C ).

Gonopods ( Figs 25A, B ) relatively complex. Coxae subquadrate, large, microtuberculate and abundantly setose ventrolaterally, with a conspicuous triangular lobe frontolaterally. Telopodite considerably longer than coxite, unciform, rather slender, setose in its basal half, with a conspicuous, biramous, microtuberculate, distofemoral process (dp) laterally at about midway, more distally with a slightly folded acropodite bearing several small outgrowths, but devoid of a hairpad; seminal groove terminating subapically.

Remarks. Glyphiulus latellai Golovatch, Geoffroy, Mauriès & VandenSpiegel, 2007 is another millipede recorded from Tiao Shuz Dong and Shu Jia Yan caves ( Golovatch et al. 2007a), whereas Liao Jing Ling Dong Cave contains the subcosmopolitan Oxidus gracilis (C. L. Koch, 1847) ( Geoffroy and Golovatch 2004) .

Figures

Figure 2. Eutrichodesmus basalis sp. n., ♀ paratype; A, anterior part of body, frontodorsal view; B, head, front view; C, antenna; D, cross-section of a midbody segment, caudal view; E, posterior part of body, ventral view; F, legs, ventral view. − Scale bars: A, B, D, E, 0.1 mm & C, F, 0.05 mm.

Figure 22. Eutrichodesmus incisus sp. n., ♀ paratype from Tiao Shuz Dong Cave; A, habitus, lateral view; B, anterior part of body, sublateral view; C, midbody segments, lateral view; D, posterior part of body, lateral view; E, anterior part of body, frontodorsal view; F, midbody segments, dorsal view. − Scale bars: A, 0.5 mm & B-F, 0.2 mm.

Figure 23. Eutrichodesmus incisus sp. n., ♀ paratype from Tiao Shuz Dong Cave; A, posterior part of body, dorsal view; B, anterior part of body, subventral view; C, midbody segments, ventral view; D, telson, ventral view; E, cross-section of a midbody segment, caudal view; F, paratergum with ozopore, lateral view. − Scale bars: A-C, E, 0.2 mm, D, 0.1 mm & F, 0.05 mm.

Figure 24. Eutrichodesmus incisus sp. n., ♀ paratype from Tiao Shuz Dong Cave; A, texture of pro- and metazona; B, texture of metatergal tubercle; C, midbody legs and sterna, ventral view; D, microtexture of prozonum, sublateral view; E, microvilli and a bisegmented seta; F, same enlarged. − Scale bars: A, C, 0.05, B, 0.01, D, E, 0.005 mm & F, 0.002 mm.

Figure 25. Eutrichodesmus incisus sp. n., ♂ paratype from Liao Jing Ling Cave; A, gonopods, ventral view; B, distal parts of gonopods, ventral. − Scale bars: A, 0.1 mm & B, 0.05 mm.

Figure 26. Eutrichodesmus incisus sp. n., ♂ paratype from Tiao Shuz Dong Cave; A, leg 9, caudal view; B & C, right gonopod, mesal and lateral views, respectively (dp = distofemoral process). − Scale bar: A, 0.2 mm, B, C, 0.1 mm.