Chilocorellus fistulachaetodontus Zhang & Wang, 2020

Zhang, Xiaoning, Liang, Xinyue, Chen, Xiaosheng & Wang, Xingmin, 2020, Three new species of the genus Chilocorellus Miyatake (Coleoptera, Coccinellidae, Sticholotidini) from the Philippines, ZooKeys 937, pp. 115-127 : 115

Chilocorellus fistulachaetodontus Zhang & Wang sp. nov. Figures 3 , 4

Holotype.

Philippines: 1 male, Mt Makiling, Luzon, Baker.

Paratypes.

1 female, Mt Maklling, Luzon, Baker; 1female, Mt Banahaw, Philippines, Luzon, Baker; 1 female, Philippines, Luzon: Lagunas Mt Banahaw nr acool ca. 1 km from Kinabuhayan, 500 m, degraded rain forest, 28 Nov. 1998.

Diagnosis.

This species can be distinguished from the other species of the Chilocorellus by following characters: body is small; elytra are black with just yellow margin; apex of penis guide with a membranous triangular prominence; penis long, anterior part and apex of penis with teeth, and apex of penis simple.

Description.

TL: 2.20-2.37 mm, TW: 1.98-2.14 mm, TH: 1.19-1.21 mm, TL/TW: 1.10-1.11; PL/PW: 0.37-0.44; EL/EW: 1.01-1.02; HW/PW: 0.50-0.56; PW/TW: 0.61-0.65; HW/TW: 0.32-0.34; Eye W/HW: 0.55-0.56.

Head yellow, eyes black. Pronotum, scutellar shield, and elytral epipleuron yellow. Elytra black with yellow margin. Underside yellow; prosternum, mesoventrite, metaventrite, and legs dark brown.

Body approximately rounded, strongly convex (Fig. 3a-c ). Head small, 0.33 times elytral width (HW/TW = 1:3.0), with sparse pubescence. Eyes oval, widest interocular distance 0.56 times head width (eye W/HW = 1:1.8). Frons broad, punctures uniform and dense (Fig. 3c, d ).

Pronotum 0.63 times of elytral width (PW/TW = 1:1.6), moderately transverse, punctures uniform (Fig. 3a, c ). Elytra with black humeral angles, punctures uniform and dense (Fig. 3a-c ). Male genitalia (Fig. 3t-w ): penis guide wide, uniformly narrowing to pointed apex, apex of penis guide with a membranous triangular prominence. Parameres extremely slender, longer than penis guide, uniformly slender with densely distributed long setae apically (Fig. 3t, u ). Penis tubular, long, curved; flabellate part of penis capsule broad, anterior part and apex of penis with dense small teeth, and apex of penis simple (Fig. 3v, w ).

Distribution.

Philippines (Luzon).

Etymology.

The name fistulachaetodontus is composed of the word fistula, which refers to the penis shape, and chaetodontus, which refers to the anterior part and apex of penis with irregular short, dense teeth.

Figures

Figure 3. Chilocorellus fistulachaetodontus sp. nov. a dorsal habitus b lateral habitus c frontal habitus d head, ventral e head, ventral f antenna g labrum h left mandible i right mandible j maxilla k labium l prothorax, ventral m mesoventrite and metaventrite n metendosternite o front leg p mid leg q hind leg r male abdomen s female abdomen t tegmen, ventral view u tegmen, lateral view v penis, lateral w apex of penis x female genitalia (ovipositor). Scale bars: 0.5 mm (a-c, m, r-s); 0.2 mm (d-e, l, n-q, t-v); 0.1 mm (f, j-k, x); 0.05 mm (g, h-i, w).

Figure 4. Distribution map. C. luzonicus Miyatake, 1994 (♦); C. quadrimaculatus Wang & Ren, 2010 (); C. protuberans Wang & Ren, 2010 (●); C. tenuous Wang & Ren, 2010 (■); C. seleuyensis Wang & Ren, 2011 (▲); C. uncinacanthus Zhang et Wang, sp. nov. (▲); C. denspinulifer Zhang et Wang, sp. nov. (●); C. fistulachaetodontus Zhang et Wang, sp. nov. (■).