Colilodion colongi, Hlaváč & Vondráček & Mohagan, 2018

Colilodion colongi View in CoL sp. nov.

Fig. 2–4 View FIGURE 2 View FIGURE 3 View FIGURE 4

Type locality. The Philippines, Mindanao island, Davao Oriental prov., Mt. Hamiguitan.

Type material. HOLOTYPE, ♂: PHILIPPINES: Mindanao isl., Davao Or. prov., Mt. Hamiguitan, Lantawan , alt. 1250–1300m, N6°42'46.92'' E126°11'21.03'', 20.ii.2017, sifting moss on ground & branch in mossy forest, Damaška, Hiřman, Šípek, Vondráček lgt. NMPC GoogleMaps . PARATYPES: 1 ex: PHILIPPINES: Mindanao isl., Davao Or. prov., Mt. Hamiguitan, Camp 4, alt. 940–960m, N6°43'51.4'' E126°10'02.2'', 21–22.ii.2017, sifting leaf litter in montane forest, Damaška, Hiřman, Šípek, Vondráček lgt. PHPC GoogleMaps . 1 ex, 1 ♀: PHILIPPINES: Mindanao isl, Davao Or. prov., Mt. Hamiguitan, Research Base , alt. 390–440m, N6°44'07.44'' E126°08'30.14'', 16–17.ii.2017, sifting leaf litter in secondary dipterocarp forest, Damaška, Hiřman, Šípek, Vondráček lgt. NMPC GoogleMaps .

Description. Length 2.15–2.50 mm, maximum width 0.80–0.95 mm. Body and appendages reddish brown ( Fig. 2 View FIGURE 2 ). Pubescence of body almost absent, short and recumbent only on appendages and composite tergite. Head ( Figs 2 View FIGURE 2 , 3A, 3B View FIGURE 3 ) about 1.6–1.7 times as long as wide. Vertex strongly raised dorsally, narrowed towards eyes, surface of raised area densely and roughly punctate, with setae in punctures, lateral area finely punctate, strongly constricted, with four well-defined, posteriorly-oriented dorsolateral and dorsomedian trichomes; posterior edge of vertex narrowed to become keel-like, bearing well-defined trichome. Frons sparsely but roughly punctate with fine pubescence on sides. Eyes laterally prominent, each eye composed of about 22 facets. Two post-ocular carinae present. Ventrally, head convergent to posterior part, gular ridge broad, about 0.25 of width of maximum width of head, thickened at middle, surface smooth.

Antennae ( Figs 2 View FIGURE 2 , 3C View FIGURE 3 ) three-segmented; scape visible in dorsal view, about as long as transverse antennomere II, strongly broadened throughout length, with impressed dorsal surface which is divided in four smooth fields, peripheral edge with short, dense pubescence, with longer macrosetae on rounded apex.

Pronotum ( Figs 2 View FIGURE 2 , 3A, 3B View FIGURE 3 ) trapezoidal, 1.2–1.3 as long as head, gradually narrowed apically, twice wider at posterior part than at base; apical portion broadly notched, notch deeper in middle; median groove narrow and of even width, born on posterior margin of notch, not reaching pronotal base; anterior corners with triangular anteriorly projecting trichomes, posterolateral angles distinct, lateral sides keeled on entire length, pronotal base with sharp, long, median process; dorsal anterior edge with short and thin trichomes oriented anteriorly.

Elytra ( Figs 2 View FIGURE 2 , 3D View FIGURE 3 ) wider than long; elytral disc flattened, densely microsculptured; elytra lacking foveae, each elytron with three wide and deep striae, sutural and external striae entire, central stria about ¾ of length of elytron; anterior margin round, humeri absent, posterior angles sharp, posterior margin of each elytron with median trichome.

Venter with prosternum with diamond process rising from anterior margin, and large vertical bifurcate process rising from posterior margin; median area with several setae, lacking obvious trichome. Anterior mesoventral edge slightly raised, pointed in middle, lateral areas with big and shallow punctures and fine setae. Metaventrite ( Figs. 2B View FIGURE 2 , 3E View FIGURE 3 ) raised in middle, declining in posterior part, with almost indistinct punctuation and setation, posterior metaventral process concave.

Abdomen ( Figs 2 View FIGURE 2 , 3F–G View FIGURE 3 ) transverse with composite tergite broadly and deeply impressed at base, impression on sides bearing trichome, sparsely punctate with short setae placed in punctures. First three visible paratergites well-defined. Second visible tergite more densely punctured. First (III) visible sternite with coarse punctation and dense microsculpture, setae fine; second visible sternite (IV) long, punctation fine, setae fine; following sternites very short, similarly microsculptured and with short setae.

Tibiae distinctly sculptured, narrowed at basal third, apical two-thirds abruptly thickened; mid and hind tibiae bearing conspicuous rows of erect setae on dorsal side.

Aedeagus ( Fig. 4 View FIGURE 4 ) long, almost three times as long as wide, basal bulb 2.7 times as long as slender, pointed apical lobe, parameres short, slightly exceeding basal bulb, with three preapical and two apical setae.

Sexual dimorphism. None apparent.

Differential diagnosis. Colilodion colongi is very similar to C. schulzi Yin & Cucccodoro, 2016 , species recently described from Palawan, the Philippines. Both species are readily separated from all other Colilodion species by the shape of antennomere III broadened throughout entire length, with impressed dorsal surface, which is divided in four smooth fields. From C. schulzi the new species differs by 1) absence of rows of thick, erect golden setae on apical margin on the composite tergite, 2) absence of erect golden setae on visible tergite II, 3) absence of conspicuous rows of erect setae on hind tibiae, 4) prosternal anterior process not triangular, posterior process bifurcate, and 5) metaventrite and second visible sternite with much less distinct punctation.

Biology. All four specimens were collected by sifting leaf litter or moss at different altitudes with different vegetation types. Two specimens were collected in lowland secondary dipterocarp forest (alt. 400–950m) on the border with agro-ecosystem (lowland) formation (alt. 300–450m). Both zones experienced logging in 1980s. Dominant species of trees are Shorea spp., Medinilla spp. and Smilax spp. as well as several species of ferns (e.g. Cyathea contaminas ). Third specimen was caught in surroundings of Camp 4, which is located in montane forest (alt. 900–1250m) usually dominated by Falcatifolium gruezoi , Shorea polysperma , or Agathis philippinensis . This region was still affected by logging in 1980s. Last specimen was collected in mossy forest (alt. 1200–1500m) with dominant species Dacrydium elatum and Calophyllum blancoi . This specimen was sifted from moss.

Etymology. Patronymic, the species is named after Mr. Ruel D. Colong (DENR-XI’s Protected Area Superintendent of Mt. Hamiguitan Range Wildlife Sanctuary) who was greatly supportive during the expedition on Mt. Hamiguitan in February 2017.

Distribution. The Philippines, island Mindanao.