Eutrichodesmus latus 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 : 23-26

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

urn:lsid:zoobank.org:act:FE7F4D6B-F489-4D30-900B-9A3E4F3D1BB9

Figs 14-17 .

Type material. China, Guangxi Prov., Yachang Nature Reserve, Yan Wu Dong Cave , 31.05.2007, leg. L. Deharveng & A. Bedos ( CHI-GX07-31/01 ), holotype ♂ ( IZAS), paratypes: 2 ♂♂, 6 ♀♀ ( MNHN JC 312 ), 1 ♂ ( SEM) ; same locality, Xia Yan Dong Cave , 28.V.2007, leg. L. Deharveng & A. Bedos ( CHI-GX07-28/01 ), 5 ♂♂ ( SCAU) ; same locality, Xiao Shui Dong Cave , 2. VI. 2007, leg. F. Bréhier ( CHI-GX07-02/07 ), 4 ♀♀, 1 juv. ( IZAS) ; same locality, She Dong Cave , 30. V.2007, leg. F. Bréhier ( CHI-GX07-30/08 ), 2 ♂♂, 1 ♀, 1 juv. ( SCAU), 1 ♂, 1 ♀, 1 juv. ( ZMUM), 1 ♂ ( ZMUC), 1 ♂ ( NMNHS), 1 ♂ ( MCSNV) .

Name. To emphasize the broad paraterga.

Diagnosis. Differs from all congeners except E. similis sp. n. by the very broad and mostly only slightly declivous paraterga, such that volvation is apparently imperfect, from E. similis sp. n. by the collum bearing no row of peculiar teeth along its entire front margin, and the gonopods being less enlarged and simpler distally.

Description. Length of adults of both sexes ca 11-13 mm, width 2.4-3.0 mm, body broadest at segments 5-16. Holotype ca 12 mm long and 3.0 mm wide. Coloration uniformly yellow-brown to brownish, sometimes slightly marbled.

Adults with 20 segments ( Fig. 14A ), conglobation pattern typical of “ Doratodesmidae ”, but volvation apparently imperfect because of paraterga being too broad and mostly only slightly declivous, leaving small lacunae laterally even when body maximally enrolled. Head ( Figs 14F ; 15A ) and tegument ( Figs 15E, F ) basically as in preceding species, but antennae somewhat longer, antennomeres 3 and 6 of subequal length ( Fig. 14F ), collum not covering the head from above, slightly elevated frontolaterally, with 4-5 irregular rows of mostly flat tubercles/bosses, including a row of more distinct cones at caudal edge ( Figs 15A, B ). Metaterga behind collum with three transverse, rather irregular rows of similarly flat tubercles, most of which still retain short, bisegmented setae ( Fig. 15A, B , D-F); limbus microcrenulate. Paraterga with evident shoulders anteriorly, mostly directed laterad, only slightly declivous, very broad, tips about level with venter, very distinctly crenulate caudolaterally ( Figs 14 A-E; 15C, D); paraterga 2 rather strongly enlarged, directed ventrolaterad, lateral margin evidently quadrilobulate, both schism and hyposchism small; paraterga 3 and

4 slightly shorter than others, bilobate laterally ( Figs 14B ; 15B ), following paraterga more broadly rounded and quadrilobulate, overlap typical. Pore formula normal, ozopores located at base of ventrocaudal lobulation ( Fig. 15D ). 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 14 C-E.

Sterna usually with a rather deep, narrow depression between coxae ( Fig. 16A ), only those between coxae 7 and 9 much wider ( Fig. 16B ). Gonopod aperture transverse-oval, relatively small, far from reaching lateral sides of segment 7 ( Fig. 16B ). Legs very long and slender; femur somewhat longer than tarsus; several basal segments in ♂

microtuberculate; claw simple, very slightly curved ventrad; some setae very sparsely microdenticulate ( Figs 14F ; 15C ; 17A ).

Gonopods ( Figs 16 B-E; 17B, C) very simple. Coxae subquadrate, large, microtuberculate and abundantly setose ventrolaterally, with a conspicuous triangular lobe frontolaterally. Telopodite considerably longer than coxite, slender, setose not only in its basal half but also at base of a digitiform and conspicuously microtuberculate distofemoral process (dp) situated laterally at about midway of telopodite, more distally with a slightly folded acropodite devoid of a hairpad; seminal groove terminating subapically.

Remarks. This species seems to be especially close to the next species.

Figures

Figure 1. Eutrichodesmus basalis sp. n., ♀ paratype; A, habitus, lateral view; B, anterior part of body, lateral view; C, midbody segments, lateral view; D, posterior part of body, lateral view; E, midbody segments, dorsal view; F, posterior part of body, dorsal view. − Scale bars: A, 0.5 mm, B, C, D & F, 0.1 mm & E, 0.2 mm.

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 3. Eutrichodesmus basalis sp. n., ♀ paratype; A, enlarged paraterga with ozopores, lateral view; B, bisegmented seta; C, tegument texture; D, limbus and adjacent parts; E, claw. − Scale bars: A, 0.05 mm, B, D, E, 0.01 mm, C, 0.02 mm.

Figure 4. Eutrichodesmus basalis sp. n., ♂ paratype; A, leg 9, caudal view; B & C, left gonopod, mesal and lateral views, respectively (dp = distofemoral process). − Scale bar: A, 0.2 mm, B, C, 0.1 mm.

Figure 5. Eutrichodesmus armatocaudatus sp. n., ♂ paratype from cave 4; A, habitus, lateral view; B, midbody segments, lateral view; C, posterior part of body, lateral view; D, midbody segments, ventral view; E, posterior part of body, ventral view; F, telson, ventral view. − Scale bars: A, 1.0 mm, B, C, E, 0.2 mm, D, 0.5 mm & F, 0.1 mm.

Figure 6. Eutrichodesmus armatocaudatus sp. n., ♂ paratype from cave 4; A, anterior part of body, frontoventral view; B, cross-section of a midbody segment, caudal view; C, enlarged paraterga with ozopores, lateral view; D, paratergum with porostele, caudal view; E, porostele; F, texture of prozonite and limbus; G, cerotegument with a bisegmented seta. − Scale bars: A, B, 0.2 mm, C, D, 0.1 mm, E, G, 0.01 mm & F, 0.05 mm.

Figure 14. Eutrichodesmus latus sp. n., ♂ paratype from Yan Wu Dong Cave; A, habitus, lateral view; B, anterior part of body, lateral view; C, posterior part of body, lateral view; D, same, dorsal view; E, same, ventral view; F, anterior part of body, ventral view. − Scale bars: A, 1.0 mm, B, C, E, 0.2 mm, D, F, 0.5 mm.

Figure 15. Eutrichodesmus latus sp. n., ♂ paratype from Yan Wu Dong Cave; A & B, anterior part of body, front and dorsal views, respectively; C, cross-section of segment 6, caudal view; D, midbody paratergum with ozopore; E, texture of prozonite and limbus; F, metatergal cerotegument with a bisegmented seta. − Scale bars: A, C, 0.5 mm, B, 0.2 mm, D, 0.1 mm, E, 0.02 mm & F, 0.01 mm.

Figure 16. Eutrichodesmus latus sp. n., ♂ paratype from Yan Wu Dong Cave; A, midbody sterna, ventral view; B, gonopods, ventral view; C, same, ventral view; D, gonopod apices, ventral view; E, tip of distofemoral process of gonopods, ventral view. − Scale bars: A-C, 0.1 mm, D & E, 0.02 mm.

Figure 17. Eutrichodesmus latus sp. n., ♂ paratype from Yan Wu Dong Cave; A, leg 9; B & C, left gonopod, mesal and lateral views, respectively (dp = distofemoral process). − Scale bar: A, 0.1 mm; B & C, 0.2 mm.