Rhyparus flavohirtus, Anichtchenko & Minkina & Vasiljeva & Medina, 2021

Anichtchenko, Alexander, Minkina, Łukasz, Vasiljeva, Anastasija & Medina, Milton Norman D., 2021, A review of the genus Rhyparus in the Philippines, with descriptions of two new species from Mindanao (Coleoptera: Scarabaeidae: Aphodiinae), Acta Entomologica Musei Nationalis Pragae 61 (1), pp. 99-111 : 100-102

Rhyparus flavohirtus sp. nov.

( Figs 2a–c , 8 , 14 , 20 , 26a–b )

Type material. Hඈඅඈඍඒඉൾ:J, labelled:ʻMindanao, Lake Holon, vi.2019 ʼ ( DUBC).

Description. Large species, body length 7.0 mm. Body surface matt, only pygidium with slightly shiny elevated area; black, except for brown or reddish-black preapical glandular area, more densely covered with yellow setae dorsally compared to other species ( Figs 2a–c ).

Head as observed dorsally and frontally ( Figs 2c and 8 , respectively): Clypeus anteriorly not sinuate, with indistinct teeth on sides, laterally distinctly emarginated and next with widely rounded angle, separated by rather small emargination from distinctly protruding, rounded genae; clypeal disc distinctly convex, ringed by deep groove, with pair of distinct, rounded tubercles. Frons with four short, blunt, posteriorly vanishing longitudinal costae, median pair shorter than lateral pair and separated one from another by narrow, deep furrow, distance between neighboring median and lateral costae twice as broad as that between two median costae. Head covered with irregularly spaced fine punctures bearing small setae. Epipharynx as in Fig. 14 .

Pronotum subquadrate, 1.13 times as wide as long; with six distinctly (but not sharply) convex costae and seven longitudinal intercostae, surface densely covered with yellow setae. Lateral margin with moderately protruding two lobes, anterior lobe triangular, median lobe obtusely angled, slightly wider than anterior lobe. Costae on anterior part present anteriorly as rounded swellings with dense concentration of setae; costae 1 (paramedian pair), 3 and 4 (lateral pairs) – continuous, costae 2 widely interrupted by transverse depression with deep caviform fossae, and another fossa in middle of third furrow at base of costae. First (median) inter-costa covered with distinct medium-sized punctures, very densely concentrated in middle to form elongated depression; lateral intercostae 1–3 abundantly punctured only in anterior part, intercostae 2 and 3 smooth in basal two thirds.

Elytra ( Figs 2a–c , 20 ), elongate, 1.73 times as long as wide, each with five costae of similar height and width from elytral base to apex, and one very long, well defined accessory costa present between costae 3 and 4, terminating posteriorly before preapical depressed area; costae slightly shiny on top, covered with yellow setae: costae 1 (sutural) with one row of setae in middle, costae 2 and 3 bordered by row of setae on each side. Intercostae 1 and 2 flat with 3 rows of punctures, with punctures in lateral rows larger than punctures in median row, punctures of intercostae 3a, 3b and 4 arranged in two rows, distances between neighboring punctures not uniform, but larger than or approximately equal to puncture diameter. Apical bulbous area of second costa densely covered with yellow macrosetae. Caudal bulbs weakly developed. Internal and median protrusion of caudal bulbs connected; external protrusion moderately developed.

Pygidium with elevated area at base, extended as costa to pygidial apex, areas on each side of costa being strongly depressed.

All legs sturdy, matt, covered with small punctures and triangular short setae (except for simple and smooth area along outer margin), greatest quantity of setae on mesotibia. Profemora strongly expanded, widest near basal third, with deep groove anteriorly; surface with medium-sized punctures throughout. Protibiae slenderer than mesotibiae, only slightly dilated apically and noticeably incurved apically; apex of protibiae with three small teeth. Mesofemora slightly narrower than profemur, posterior margin bilobed, surface punctate throughout, punctures smaller compared to those on profemora. Mesotibiae narrow at base, gradually expanded from base to about one third of length, and then narrowed to apex; apex of mesotibiae with large projection and tooth (larger than protibiae apical teeth). Metafemora long, slightly narrower than mesofemora; narrow at base, gradually expanded, apical part narrowed; punctures as on mesofemora. Metatibiae larger than mesotibiae, but similar in shape, but not narrowed preapically, only slightly widened to apex.

Venter matt, black. Prosternum with long anterior process with rounded apex and hastate posterior process. Mesoventrite with shallow setigerous punctures and small setae. Meso-metaventral plate with distinct, shallow medi- an impression; surface otherwise with irregular medium- sized setigerous punctures. Abdomen with six abdominal ventrites, all separated by impressed sutures; surface punctate-setose. Ventrites 3–5 triangularly grooved on each lateral broadened area, groove noticeably large on ventrite 5; ventrites 5–6 fused, medially with costae.

Aedeagus as in Figs 26a–b .

Differential diagnosis. The new species can be distinguished from all Rhyparus species worldwide based on the combination of very long accessory costa, dense setation of dorsal surface, and number of rows of punctures on intercostae.

Etymology. The specific epithet is composed of the Latin adjectives flavus, - a, - um and hirtus, - a, - um, and alludes to the dense covering of yellow setae on the dorsum of body.

Distribution. Species known only from type locality in Mindanao Island, the Philippines.

Figures

Fig. 2. Habitus of Rhyparus flavohirtus sp. nov., male, holotype: a – dorsal view; b – right dorsolateral view; c – right lateral view. Scale bar = 1.0 mm.

Figs 7–12. Head of Rhyparus species, frontal view: 7 – R. barclayi Masumoto, Ochi & Ho, 2019; 8 – R. flavohirtus sp. nov.; 9 – R. gracilis Arrow, 1905; 10 – R. helophoroides Fairmaire, 1893; 11 – R. mindanaoensis sp. nov.; 12 – R. philippinensis Arrow, 1905. Scale bar = 1.0 mm.

Figs 13–18. Epipharynx of Rhyparus species: 13 – R. barclayi Masumoto, Ochi & Ho, 2019; 14 – R. flavohirtus sp. nov.; 15 – R. gracilis Arrow, 1905; 16 – R. helophoroides Fairmaire, 1893; 17– R. mindanaoensis sp. nov.; 18 – R. philippinensis Arrow, 1905. Scale bar = 0.5 mm.

Figs 19–24. Elytra of Rhyparus species, oblique apico-dorsolateral view: 19 – R. barclayi Masumoto, Ochi & Ho, 2019; 20 – R. flavohirtus sp. nov.; 21 – R. gracilis Arrow, 1905; 22 – R. helophoroides Fairmaire, 1893; 23 – R. mindanaoensis sp. nov.; 24 – R. philippinensis Arrow, 1905. Scale bar = 1.0 mm.

Figs 25–30.Aedeagus of Rhyparus species, a – lateral view, b – dorsal view. 25 – R.barclayi Masumoto, Ochi & Ho, 2019; 26 – R. flavohirtus sp. nov.; 27 – R. gracilis Arrow, 1905; 28 – R. helophoroides Fairmaire, 1893; 29 – R.mindanaoensis sp. nov.; 30 – R.philippinensis Arrow, 1905. Scale bar = 0.5 mm.