Hyleoglomeris nagarjunga Golovatch, 1987

Golovatch, Sergei I., Geoffroy, Jean-Jacques & Mauriès, Jean-Paul, 2006, Review of the millipede genus Hyleoglomeris Verhoeff, 1910 (Diplopoda, Glomerida, Glomeridae), with descriptions of new species from caves in Southeast Asia, Zoosystema 28 (4), pp. 887-915 : 894-897

publication ID	https://doi.org/ 10.5281/zenodo.4525415
publication LSID	lsid:zoobank.org:pub:3DA8E001-FE3C-418D-9AA1-3CB0BC6F5FD8
persistent identifier	https://treatment.plazi.org/id/03AE8781-FF9F-FFF0-F3BB-FE1A941BF921
treatment provided by	Felipe
scientific name	Hyleoglomeris nagarjunga Golovatch, 1987
status

Treatment

Hyleoglomeris nagarjunga Golovatch, 1987 View in CoL

MATERIAL EXAMINED. — Nepal. Langlang Valley, Syabrubesi, 1600 m, 15.IX.1984, leg. P. Beron & S. Andreev, 1 ♂ ( NMNHS).

REMARKS

This new material, which can be considered as near-topotypic, is in perfect agreement with the original description ( Golovatch 1987).

Hyleoglomeris robusta Attems, 1938 View in CoL ( Fig. 3 View FIG )

MATERIAL EXAMINED. — Vietnam. Lam Dong, Dalat, Peak Lang Bian, 1800-2000 m, secondary forest, 21.XII.1998, leg. L. Deharveng & A. Bedos, 1 ♂, 1 ♀ ( MNHN CC 161).

DESCRIPTION OF NEW MATERIAL

Length 13.5 (♂) and 15 mm (♀), width 7.0 (♂) and 7.2 mm (♀). Background coloration dark gray-brown to blackish, legs yellow to red-brown, telopods pale red-brown, markings on terga from yellow to gray-yellow.

Head above level of antennal sockets marbled reddish-brown to dark brown, antennae dark redbrown to blackish, antennomere 6 about 2.3-2.4 times longer than wide; ocelli 7 + 1 (♂) or 6 + 1 (♀), black, convex. Collum dark, with a transverse, central, marbled yellow-brown spot.

Body with a narrow axial stripe, latter obscure in anterior halves of terga but broadened into a clear subtriangular spot at caudal edge ( Fig. 3A View FIG ). In addition, thoracic shield with 1 +1 large,paramedian,distinctly marbled spots nearly (♀) or fully (♂) in touch anteromedially, both well removed from sides. Subsequent terga with similar but sublateral spots.Pygidium with a small median spot at caudal margin. Caudal and lateral margins of all terga broadly translucid.

Collum with two transverse striae.

Thoracic shield with a relatively narrow hyposchism slightly surpassing the caudal tergal contour; 10 (♂) or 9 (♀) transverse striae, of which 4 or 5 start above the schism and 8 or 7 cross the dorsum, respectively; last two striae abbreviated and positioned very far from schism, first stria never crossing the entire shield.

Pygidium regularly rounded in both sexes.

Male leg 17 ( Fig. 3B View FIG ) with a high outer coxal lobe; telopodite 4-segmented.

Male leg 18 ( Fig. 3C View FIG ) with an ogival syncoxital notch; telopodite 4-segmented.

Telopods ( Fig. 3D View FIG ) with a rather high and poorly emarginate central syncoxital lobe flanked by two simple setose horns pointed apically. Prefemur micropapillate laterally. Caudomedial outgrowth of tibia with a tubercle at base. Tarsus rather narrowly rounded apically.

REMARKS

This new material, which can be considered as strictly topotypic, is in good but not complete agreement with the original description ( Attems 1938). Thus, the size of the holotype female (16 mm long, 8.2 mm wide) appears to be somewhat larger than that of the topotypes. The colour of the legs was stated to be red-brown, whereas in the fresh material at hand the entire venter with legs is yellow to light red-brown. The colour pattern of the pygidium was described in a highly contradictory way, suggesting a mistake. First it was said to show a large, light, subquadrate spot flanked by two marbled fields with adjacent spots. Then, the same pygidium was stated as having a brown-yellow, subquadrate, median spot extending from the caudal margin up to 2/3 length of the pygidium. We can assume that in the first case Attems (1938) actually described the colour pattern of the thoracic shield, whereas in the second he was describing that of the pygidium proper. In the new samples, the patterns agree well with these descriptions, but the pale median spots seem to be smaller and subtriangular on all postcollar terga, including the pygidium. Moreover, the number of striae on the thoracic shield was said to be 11, of which 9 cross the dorsum, whereas in the new material there are 9 or 10 such striae, with only 7 or 8 crossing the entire shield.

The fresh material at hand allows not only the description of the male characters, but also the structure of the hyposchism, which was totally ignored by Attems.

In addition, this material provides further insights into the identity of two other congeners known from S Vietnam. The first of these is H. electa in the sense of Attems (1938, 1953). As noted above, Attems (1938) recorded and redescribed this species – originally described from a female from the Himalayas ( Silvestri 1917) – from Peak Lang Bian near Dalat, Vietnam, which is the type locality of H. robusta , and later ( Attems 1953) reported the same species from Laos.

When one compares Attems’ description of H. electa with the above redescription of H. robusta , a good match is also evident. However, H. electa from Lang Bian differs in having a smaller body size (less than 10 mm long); a larger median spot on the pygidium; a higher number (12) of striae on the thoracic shield, of which only 3-5 cross it entirely; a lower outer coxal lobe of male leg 17; bifid syncoxital horns of the telopods and some other traits.

The other species to be compared is H. maior , known from two localities in S Vietnam ( Attems 1938), both lying not too far away from Dalat. Here the match is even more complete: ♂ 15 mm long and 7.0 mm wide, ♀ 17 mm long and 9.0 mm wide; a light, narrow, triangular, caudomedian spot present on most terga, including the pygidium; 8 striae on the thoracic shield, of which 6 cross the dorsum; the outer lobes of male leg 17 are very high; the tips of the syncoxital horns of the telopods are simple and acuminate.

Despite the differences, the above sample from Lang Bian is referred to H. robusta not only because of strict syntopy (shared as well with H. electa in the sense of Attems), but also in view of the similarities in body size, colour pattern, the total number of striae on the thoracic shield and of those crossing the shield entirely (closer to both H. robusta and H. maior , though quite comparable with H. electa as well), the conformation of male legs 17 and 19 (previously unknown in H. robusta , in some respects, such as the high outer coxal lobes and the simple and acuminate syncoxital horns, being more similar to H. maior , whereas in some other points, such as the shape of the syncoxital lobe, more like H. electa ).

In other words, though differing in several minor details, the new sample appears to somewhat bridge the gaps between the existing descriptions of H. robusta , H. maior and H. electa in the sense of Attems. However, only abundant additional material coming from various places in Indochina, combined with a restudy of the relevant types, topotypes or identified samples, can help resolve the riddle, if, at least in S Vietnam, we face a single polymorphic species, as suggested here, or there are indeed several distinct but closely related congeners involved. In any event, the serious doubts expressed by Golovatch (1987) as regards the conspecificity of material of H. electa from the Himalayas and Indochina remain.

Hyleoglomeris sinensis ( Brölemann, 1896) View in CoL ( Figs 4 View FIG ; 5 View FIG )

TYPE MATERIAL. — China. Tibet, Tat-Sien-Lou, leg. Oberthur, ded. Dolfuss, lectotype ♂ (here designated), paralectotypes 5 ♂♂, 2 ♀♀ ( MNHN CC 089). — Sichuan Province, Siao-Lou, leg. Oberthur, ded. Dolfuss, paralectotypes 7 ♂♂, 6 ♀♀ ( MNHN CC 089).

DIAGNOSIS. — Differs from congeners by the peculiar colour pattern, combined with the particularly strongly enlarged telopods with subtransverse and denticulate syncoxital horns.

DESCRIPTION

Length 8.5-9.5 (♂) or 9.75-10 mm (♀), width 5.5-6.0 (♂) or 5.5-6.5 mm (♀).

Lectotype ♂ 9.0 mm long and 5.5 mm wide. Background coloration of this once dried material, now in alcohol, rather uniformly dark brown to blackish, legs dark brown, antennae dark brown to blackish.

Colour pattern ( Fig. 5A View FIG ) usually traceable as a rather clear, wide, paler band along anterior edge of thoracic shield, often also as 1 + 1 vague, sublateral, strongly marbled spots on terga (2)3-11.

Antennomere 6 c. 2.8 times longer than wide; ocelli 6 + 1 to 7 + 1, black, convex.

Collum with two transverse striae.

Thoracic shield with a narrow hyposchism not reaching the caudal tergal contour; 10 or 11 transverse striae, of which 5 or 6 start above the schism and 6 or 7 in differing combinations cross the dorsum ( Fig. 4A View FIG ).

Male pygidium strongly emarginate medially at caudal margin ( Fig. 5A View FIG ).

Male leg 17 ( Fig.5B View FIG ) with a rather low to mediumsized, often irregularly rounded, outer coxal lobe; telopodite 4-segmented.

Male leg 18 ( Figs 4B View FIG ; 5C View FIG ) with a more or less broadly ogival syncoxital notch; telopodite 4-segmented.

Telopods ( Figs 4C, D View FIG ; 5D View FIG ) particularly strongly enlarged, heavily sclerotised, with a high, roundly subquadrate syncoxital lobe flanked by two denticulated horns directed (sub)mesad and each crowned with a harpoon-shaped structure ( Fig. 5E View FIG ). Caudomedial outgrowth of tibia with a tubercle at base. Tarsus rather subacuminate to narrowly rounded apically.

REMARKS

A lectotype is here selected from the syntype series from Tibet (original label reading “ Glomeris Oberthuri Brölemann n. sp., Chine, Thibet, Tat- Sien-Lou (Oberthur 1/2 Dolfuss)”), because, as clearly stated on Brölemann’s original drawings, only the dissected male served for the execution of the illustrations reproduced here as Figure 4A, C, D View FIG (Iconographie Brolemann, MNHN). The label name “Oberthuri” is a nomen nudum, since the species was published as sinensis .

To document that the other series of paralectotypes represents the same species, Figure 5 View FIG has been prepared. The original label reads “ Glomeris Oberthuri Brölemann n. sp., Chine, Province de Si-Tchouen, Siao-Lou (Dolfuss)”.