Hyleoglomeris hoanglien sp., 2019

Nguyen, Anh D., Eguchi, Katsuyuki & Hwang, Ui W., 2019, Two new pill millipedes (Diplopoda: Glomerida: Glomeridae) from high mountains of Vietnam, Journal of Natural History 53 (21), pp. 1369-1384 : 1370-1374

publication ID	https://doi.org/ 10.1080/00222933.2019.1646338
DOI	https://doi.org/10.5281/zenodo.3679865
persistent identifier	https://treatment.plazi.org/id/2C5787C9-3D7F-5A61-FE4F-33D17131FA71
treatment provided by	Valdenar
scientific name	Hyleoglomeris hoanglien sp.
status	sp.

Treatment

Hyleoglomeris hoanglien sp. nov.

( Figures 1 – 4 View Figure 1 View Figure 2 View Figure 3 View Figure 4 )

Material examined

Holotype. One male (IEBR-Myr 672H)ı Lao Cai Prov. ı Sa Paı Hoang Lien National Parkı short bamboo forestsı Fanxipan Mt. ı 2ı800 – 2ı 900 m alt.ı 103°52 ʹ 42 ″ Eı 22°21 ʹ 22 ″ Nı 23 September 2017ı leg. Anh D. Nguyen & K. Eguchi.

Paratypes. One maleı four females (IEBR-Myr 672P)ı with the same data as the holotype.

Diagnosis

A small-sized (2.3 mm wideı and 5.2 mm long) and black or blackish-brown body; ocelli 8 + 1; antennal tip with four large sensory cones; thoracic shield with eight transverse striae; telopods short and stout; syncoxital lobe bifid trapeziform; syncoxital horns highly elevatedı directed mesoventrally; tips of syncoxital horns with a long seta and a pointed spine; both prefemoral and femoral trichosteles present; femora condensedı with a ventrally directed process; tibia without modifications.

Etymology

Named after the localityı ‘hoanglien’ noun in appositionı where the type specimens were found.

Description

Size. Holotype male (IEBR-Myr 672 H). Width of second tergum 2.3 mm; body length 5.2 mm.

Colour. Generally black or blackish-brown except for a medial brownish-yellow spotı two distolateral marbled brownish-yellow oval spots and light yellowish lateral margins.

Head. Ocelli 8 + 1; lenses convexı black contrasting against to brownish background of head. Tömösváry organs transverse ovalı ca. 1.5 X wider than long. Antenna clavate apically; antennomere 6 largeı ca. 2.0 – 2.5 X longer than wide. Antennal tip with four largeı apical sensory cones.

Body. Collum semicircuları with a very large marbled brownish-black spot centrallyı and two transverse striae; other part of collum black. Thoracic shield (= tergum 2) with a narrow hyposchismı not reaching caudal margin; with 8 clearly distinct transverse striae of which all cross the dorsum. Other terga with 3 – 4 shortı vague transverse striae. Anal shield strongly roundedı emarginate mediocaudally.

Legs. Leg-pair 17 strongly reducedı 4-segmented; coxite with a rounded outer lobeı with a setiferous tubercle distomesally; podomere 1 with a small distomesal setiferous knob. Leg-pair 18 less strongly reducedı 4-segmentedı with a simple syncoxital notch.

Genitalia ( Figures 3–5 View Figure 3 View Figure 4 View Figure 5 ). Telopods shortı stoutı and incrassate. Syncoxital lobe bifid trapeziform. Syncoxital horns highly elevatedı directed mesoventrallyı with numerous setae; tips with a long seta and a pointed spine. Prefemur (pref) micropapillate laterally and posterolaterallyı with a longı prominentı finger-shaped trichostele (pret). Femora (fe) condensedı also with a longı prominentı finger-shaped trichostele (fet). Femoral process (fp) directed ventrally; base broadly enlarged; tip folded; posterior surface densely micropapillate. Tibia (ti) without modificationsı but the tibial process (tp) directed mesoventrally. Tarsus (ta) curvedı bearing an apical seta; inner side also densely micropapillate.

Variation. Width of second tergum 2.5 – 3.2 mm in the female; body length 5.2 – 6.7 mm in the female.

DNA barcode

COI barcode data (partial) is for the paratype uploaded to GenBank under the accession number MH248038. The new species shares the identity of 87% and 86% with Trachysphaera schmidtii and Glomeris connexa ı respectively.

Remarks

The new species is known as the smallest glomerid recorded in Vietnam. The previously smallestı troglobiotic speciesı H. spelaea ı has a width of the second tergum of ca. 3.0 mm. The new species seems to belong to the sinensis -group characterised by telopods being incrassate ( Golovatch et al. 2006). This group currently consists of two speciesı H. sinensis (Brölemannı 1896) and H. emarginata Golovatchı 1981 ı both from China. The new species differs from both species in its smaller size (2.3 mm wideı 5.2 mm long vs. 5.5 – 6.0 mm wideı 8.5 – 9.5 mm long vs 3.0 – 4.0 mm wideı 6.0 – 9.0 mm long)ı having 8 + 1 ocelliı and in the shape and direction of syncoxital horns. Syncoxital horns are highly elevatedı directed mesoventrallyı with numerous setae; tips with a long seta and a pointed spine in Hyleoglomeris hoanglien sp. nov.; directed mesally and denticulate in H. sinensis ; directed subventrally and lanceolate in H. emarginata .