Glyphiulus costulifer, Golovatch & Geoffroy & Mauriès & Spiegel, 2007

Golovatch, Sergei I., Geoffroy, Jean-Jacques, Mauriès, Jean-Paul & Spiegel, Didier Van Den, 2007, Review of the millipede genus Glyphiulus Gervais, 1847, with descriptions of new species from Southeast Asia (Diplopoda, Spirostreptida, Cambalopsidae). Part 2: the javanicus-group, Zoosystema 29 (3), pp. 417-456 : 436

publication ID	https://doi.org/ 10.5281/zenodo.5393630
persistent identifier	https://treatment.plazi.org/id/B36487D8-FFD2-D52B-D2E2-FDA3FB81FA9E
treatment provided by	Marcus
scientific name	Glyphiulus costulifer
status	sp. nov.

Treatment

Glyphiulus costulifer View in CoL n. sp.

( Figs 14-16 View FIG View FIG View FIG )

TYPE MATERIAL. — Laos. Luang Prabang Prov., Nong Kiaw (Muang Ngoy), Tham Pha Kouang Cave , 102.68°E, 20.72°N, 29.XII.2000, leg. A. Bedos & L. Deharveng (LAO-099), holotype ♂ ( MNHN GA 049 About MNHN ) GoogleMaps ; paratypes 3 ♂♂, 2 ♀♀ ( MNHN GA 049 About MNHN ) GoogleMaps ; 1 ♂ ( SEM) ; 1 ♂, 1 ♀ ( ZMUM) ; 1 ♂, 1 ♀ ( ZMUC) ; 1 ♀ ( NMNHS) .

ETYMOLOGY. — To emphasize the normally carinate collum.

DIAGNOSIS. — Differs from congeners by the nearly typical carinotaxy pattern of the collum, coupled with highly unusual traces of both ventrolateral crests, the very little modified male coxae 1, the long but bare flagellum of the posterior gonopods, etc. (see also key below).

DESCRIPTION

Holotype with 56p+1a+ T, about 28 mm long and 1.8 mm wide; paratypes (♂, ♀) with 48-62p+3-1a+ T, length 23-35 mm, width 1.5-1.9 mm.

Coloration light yellow-brown to red-brown, tergal crests often dark castaneous brown. Greyish to red-brown, subtriangular eye patches with 7-9 ocelli each. Antennae usual ( Figs 14A View FIG ; 16A View FIG ), gnathochilarium (mentum divided, n = 3) oligotrichous ( Fig. 16B View FIG ).

Head width = segment 2 = 6 <collum = 7(8)> segment 3 = 5 <7 <8 <9 <10 <11 = midbody segments; body gradually tapering toward telson. Postcollar constriction evident ( Fig. 14B View FIG ).

Collum almost typically crested, only median crest (ma) unusually abbreviated; carinotaxy pattern typical of the granulatus -group (I-VI+7a+pc+ma+pc+7a+VI- I) ( Fig. 14A, B View FIG ). Subsequent metaterga evidently crested as well ( Fig. 14 View FIG A-E).Carinotaxy formula 2+I/ i+3/3+I/i+2, i.e. all dorsal crests subdivided ( Fig. 14C, D View FIG ), while both ventrolateral crests undivided, barely traceable as ribbons of micropunctate/shagreened texture ( Fig. 15B View FIG ). Ozoporiferous tubercles round, only slightly wider than high ( Fig. 15A, B View FIG ).

Tegument delicately alveolate-areolate, dull throughout. Fine longitudinal striations in front of stricture between pro- and metazona ventrolaterally, laterally and dorsally, remaining surface of prozona very delicately shagreened. Segments round in crosssection ( Fig. 15A View FIG ). Epiproct with a distinct, humplike ridge dorsally in distal 3/4 extent ( Fig. 14E View FIG ), in ventral view rounded and subtriangular in caudal part ( Fig. 14F View FIG ). Paraprocts flattened ventrally, with only a shallow but evident submarginal depression beside caudal edge, each with a row of about a dozen setae at medial margin ( Fig. 14F View FIG ). Hypoproct sublanceolate, very delicately and broadly emarginate caudomedially ( Fig. 14F View FIG ).

Ventral flaps behind gonopod opening on male segment 7 distinguishable as a low but clear transverse ridge ( Fig. 15C View FIG ).

Legs long, those on midbody segments about as long as segment diameter ( Fig. 14C View FIG ). Claw with a short but evident accessory spine at base ( Fig. 16 View FIG C-F).

Male legs 1 highly characteristic ( Fig. 16C View FIG ) in showing only slightly modified coxae with two low, paramedian, contiguous cones; telopodites 5-segmented, normal. Male legs 2 and 3 modified as usual ( Fig. 16D, E View FIG ).

Anterior gonopods ( Figs 15D View FIG ; 16G View FIG ) not notched, paramedian processes (d) high, telopodites evidently curved. Posterior gonopods ( Figs 15E, F View FIG ; 16H View FIG ) highly compact, typical of the group, flagella (f) high and bare.

REMARKS

Due to the nearly unmodified male legs 1, this species is probably among the basalmost in the genus.

In the absence of any troglomorphic traits, this species can only be considered troglophilic at most. This cave is known to support another congener, G. bedosae Golovatch, Geoffroy, Mauriès & Van den Spiegel, 2007 (see Golovatch et al. 2007). Interestingly, both species share the same, rather conspicuous structure of the telson.

MNHN	Museum National d'Histoire Naturelle
ZMUM	Zoological Museum, University of Amoy
ZMUC	Zoological Museum, University of Copenhagen
T	Tavera, Department of Geology and Geophysics