Chilocorellus denspinulifer 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 denspinulifer Zhang & Wang sp. nov. Figures 2 , 4

Holotype.

Philippines: 1 male, Puerto Princesa, Palawan Is, sea level, secondary growth forest, IV 47.

Paratype.

1 female, Philippines, Puerto Princesa, Palawan Baker.

Diagnosis.

This species is similar to C. uncinacanthus , C. protuberans , C. tenuous , and C. seleuyensis by the strongly convex, yellow elytra having no spots. But unlike these species, its body is small, the anterior and apex of the penis is tubular with irregular dense tiny teeth. In C. uncinacanthus , the apex of the penis is hatchet-shaped and bears large teeth; in C. protuberans , the apex of the penis is curved and membranous, with many small teeth; in C. tenuous , the apex of the penis is straight and membranous, with many asymmetrical large teeth.

Description.

TL: 2.33-2.40 mm, TW: 2.26-2.28 mm, TH: 1.11-1.21 mm, TL/TW: 1.03-1.05; PL/PW: 0.37-0.47; EL/EW: 0.94-0.97 HW/PW: 0.53-0.55; PW/TW: 0.58-0.59; HW/TW: 0.31-0.32; Eye W/HW: 0.33-0.41.

Head yellow, with eyes silver-gray. Pronotum, scutellar shield, and elytra uniformly yellow, with tiny dense punctures. Underside yellow; prosternum, mesoventrite, metaventrite, and legs yellowish brown.

Body rounded, strongly convex (Fig. 2b, c ). Head small, 0.32 times elytral width (HW/TW = 1:3.2), with sparse pubescence. Eyes oval, widest interocular distance 0.37 times head width (eye W/HW = 1:2.7). Frons broad, punctures uniform and dense (Fig. 2c, d ).

Pronotum 0.59 times elytral width (PW/TW = 1:1.7), moderately transverse, punctures uniform (Fig. 2a, c ). Elytra with humeral angles, punctures uniform and dense (Fig. 2a-c ). Male genitalia (Fig. 2t-w ): penis guide wide at base in lateral view and uniformly narrowing to pointed apex; parameres obviously longer than penis guide, uniformly slender with densely distributed long setae apically (Fig. 2t, u ); penis tubular, extremely long, curved; flabellate part of penis capsule broad, anterior and apex of penis with irregular tiny dense teeth, and apex of penis nest-shaped (Fig. 2v, w ).

Distribution.

Philippines (Puerto Princesa).

Etymology.

The name denspinulifer is composed of the Latin word dens, meaning dense, and spinulifer, which refers to the part of the penis with spinulose appendage.

Figures

Figure 2. Chilocorellus denspinulifer sp. nov. a dorsal habitus b lateral habitus c frontal habitus d 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, v); 0.2 mm (d, l, n-q, t-u; f), 0.1 mm (h-k, x); 0.05 mm (g, 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. (■).