Limbodessus wilhelmina, Balke & Villastrigo & Hájek & Surbakti & Panjaitan & Hendrich, 2025

Balke, Michael, Villastrigo, Adrián, Hájek, Jiří, Surbakti, Suriani, Panjaitan, Rawati & Hendrich, Lars, 2025, A review of Limbodessus Guignot, 1939 from New Guinea, with description of eight new tropical-alpine species (Coleoptera, Dytiscidae, Bidessini), Alpine Entomology 9, pp. 5-28 : 5-28

publication ID	https://doi.org/10.3897/alpento.9.147831
publication LSID	lsid:zoobank.org:pub:15F39A4A-E56E-41F1-860B-90B05ABF06E8
DOI	https://doi.org/10.5281/zenodo.15603980
persistent identifier	https://treatment.plazi.org/id/460BBBAF-B21D-5AF4-823C-8CF0FE8FBA48
treatment provided by	Alpine Entomology by Pensoft
scientific name	Limbodessus wilhelmina
status	sp. nov.

Treatment

Limbodessus wilhelmina sp. nov.

Figs 2 A View Figure 2 , 7 C View Figure 7 , 10 A, B View Figure 10 , 11 C View Figure 11 , 12 A, B View Figure 12 , 13 D View Figure 13 , 14 View Figure 14 , 16 C View Figure 16

Type locality.

Mossy puddles in Alpine grassland, Lake Habbema, 3,200 m [4°07'77S, 138°40'77E], Papua, Indonesia.

Type material.

Holotype, male: “ Indonesia, Papua, Lake Habbema , pools, 3200 m, 19. x. 2011, 04.07. 772 S 138.40. 773 E, team UNCEN leg. ( PAP 06 ) ”, “ Holotype Limbodessus wilhelmina sp. nov. Balke et al. 2025 ” [red printed label] ( MZB) .

Paratypes (632): 182 exs., with the same label data as the holotype ( MZB, KSP, ZSM) ; 395 exs. “ IRIAN JAYA: Trikora Gebiet 19. - 20. 10. 1993, Habbema [Lake] and Kali Oue Tal [Valley] , ca. 138°43'E 04°13'S, 3450 m, leg. M. Balke (39) ” [IR 93 # 39] ( MZB, NHMW, KSP, ZSM) GoogleMaps ; 22 exs., “ Irian Jaya: 18. 10. 1993 Trikora Area Fuß des Mt. Trikora , ca. 138°43'E 04°13'S, 3200 m, leg. M. Balke (38) ” [IR 93 # 38] ( NHMW, ZSM) GoogleMaps ; 3 exs., “ Irian Jaya, Wamena E, Habbema lake , 4°07'S 138°40'E, 20. 1. 1999, leg. A. Weigel ” ( ZSM) GoogleMaps ; 27 exs., “ INDONESIA, Papua: Jayawijaya Distr., ca. 30 km W of Wamena, open wetland nr Habbema lake , 0 4°07.8'S, 138°40.7'E; 3330 m, J. Hájek & J. Šumpich leg., 5. ii. 2015 ” ( NMPC) GoogleMaps ; 2 exs., “ Indonesia, West Papua, Highland near Lake Habbema , Sphagnum-pools near the road, 3451 m, 4°06'32.8"S 138°38'54.2"E, 09. 06. 2022, N. Wendlandt leg. ” ( CNW, ZSM) GoogleMaps . All paratypes are provided with a red printed paratype label.

Measurements.

Holotype: TL = 1.8 mm; TL-H = 1.65 mm; MW = 0.85 mm. Paratypes: TL 1.7–1.9 mm, TL-H = 1.6–1.75 mm; MW = 0.85–0.9 mm.

Description.

Small, body oblong-oval, with distinct discontinuity in lateral outline between pronotum and elytron. Cervical or sutural line absent. Pronotal and elytral stria present and distinct (Fig. 2 A View Figure 2 ).

Color. Body chiefly black. Clypeus anteriorly, pronotum laterally slightly paler, castaneous brown. Antenna almost completely blackish. Legs dark ferruginous to blackish (Fig. 2 A View Figure 2 ). Ventral side chiefly black. Prosternum, epipleura and sternite 7 ferruginous.

Sculpture. Head comparably densely punctate; punctation apically sparse; with indistinct microreticulation of small polygonal meshes. Size of punctures corresponds to diameter of meshes. Pronotum shiny; rather sparse and fine punctation; slightly denser and coarser along fore-margin; without microreticulation. Elytron with moderately dense and evenly distributed punctation; size of punctures as on head or slightly larger; between punctures with large, indistinct polygonal meshes. Ventral side with few punctures, shiny; only sternite 7 with distinct microreticulation.

Structures. Metacoxal lines anteriorly diverge and do not reach posterior margin of metaventrite.

Male. Elytron shiny, without visible microreticulation between punctures. Antenna stout (Fig. 13 D View Figure 13 ). Median lobe as in Fig. 7 C View Figure 7 and parameres as in Figs 10 A, B View Figure 10 , 11 C View Figure 11 .

Female. Elytron shiny, without visible microreticulation between punctures. Antenna stout but without conspicuous modifications (Fig. 12 A, B View Figure 12 ).

Etymology.

Named after the highest peak in the type area, Mount Wilhelmina (the historic name of what is nowadays known as Mt. Trikora). The name is a noun in the nominative standing in apposition.

Distribution.

Only known from the Lake Habbema area, in the Central Highlands of Papua (Fig. 14 View Figure 14 ).

Differential diagnosis.

Limbodessus wilhelmina sp. nov. belongs to a group of smaller (TL = 1.55–1.9 mm) and almost blackish high alpine species. The new species is close to L. aipo sp. nov., L. aldente sp. nov. and L. elit sp. nov. but can be separated from them by the form of the female antennae, which is stout without any conspicuous modifications (Fig. 12 A, B View Figure 12 ), the form of the median lobe (Fig. 7 C View Figure 7 ), and the form of the parameres (Figs 10 A, B View Figure 10 , 11 C View Figure 11 ).