Grouvellinus andrekuipersi Freitag, Pangantihon and Njunjić, 2018

Freitag, Hendrik, Molls, Christian, Bouma, Aglaia M., Garces, Jhoana M., Rossato, Marzia, Cosentino, Emanuela & Delledonne, Massimo, 2019, Additional new species of Grouvellinus Champion 1923 (Insectaı Coleopteraı Elmidae) discovered by citizen scientists and DNA barcoded in the field applying a novel MinIONbased workflow, Journal of Natural History 53 (41), pp. 2593-2620 : 2597-2600

Grouvellinus andrekuipersi Freitag, Pangantihon and Njunjić, 2018

( Figure 2 )

Grouvellinus andrekuipersi ; Freitag et al. 2018: 13 – 19, figures 4, 9, 10 (orig. descr.).

Material examined. 13, 2exs. (SP) ‘ MALAYSIA: Sabah: Lucia River; rock surface, run; primary forest; ca. 4°28 ʹ 34 ʹʹ N, 117°55 ʹ 38 ʹʹ E, ca. 750 m a.s.l., leg. Taxon Expedition partici- pants 10.March.2018 (6g)M ’; Paratypes: 13 [H13], 2 exs. (SP) ‘ MALAYSIA: Sabah: Lucia River; root packs, riffle; primary forest; ca. 4°28 ʹ 34 ʹʹ N, 117°55 ʹ 38 ʹʹ E, ca. 750 m a.s.l., leg. Taxon Expedition participants 10.March.2018 (6h)M ’ ; 1 3 [H19], 1 ♀ (BOR/COL) ‘ MALAYSIA: Sabah: Maliau Basin: Giluk River; Cryptochorinae water plants, run; ca. 4° 44 ʹ 36 ʹʹ N, 116°52 ʹ 21 ʹʹ E, ca. 980m a.s. l. 01.X.2017, leg. H. Freitag, C.V. Pangantihon & I. Njunjić (GilR2r) ’.

Remarks

The specimens agree well with the type material from the Maliau Basin. The specimens from Tawau tend to be very slightly slenderer, 2.05 times as long as wide (CL/EW). From all other Bornean Grouvellinus species, it varies most conspicuously in the aedeagal character. Among the known species from Borneo, it is of medium size (1.7 – 1.8 mm CL), with distinct pronotal characters (moderately sparsely punctate; punctures very small and shallowly impressed; setae moderately long; interstices glabrous and flat; sublateral carinae very indistinct and short; oblique impression moderately deep and narrow, laterobasal impression indistinct). It belongs to an almost cryptic species group with two pairs of more or less conspicuous yellowish elytral spots.

The first mtDNA barcodes for the species are presented here ( LR738835 , LR738833 ). The species varies at least by 6.6% genetic distance (654bp CO1 barcode) from the most similar Bornean congener G. nigerquadratus sp. nov.

Distribution

Grouvellinus andrekuipersi is known only from Borneo Island ( Freitag et al. 2018), namely the upper Maliau Basin, Tawau Hills Park, and Crocker Range in Sabah and two sites in eastern Sarawak ( Figure 18 ).

Figures

Figure 18. Map of Sabah and Brunei (Borneo) with collecting site of Grouvellinus species with new species record in red fonts.

Figures 2–5. Habitus of the Grouvellinus species collected from the Tawan Hills Park. 2: G. andrekuipersi; 3: G. nigerquadratus, sp. nov. (paratype male from Tawau River); 4: G. nigerquadratus, sp. nov. (male from Lucia River); 5: G.cruxniger, sp. nov. (paratype male from Lucia River). Scale: 1 mm.