Peltocercyon rugosipennis Mai, Jia, Ryndevich

Mai, Zuqi, Jia, Fenglong, Ryndevich, Sergey K., Angus, Robert, Minoshima, Yûsuke N., Fikáček, Martin & Růžička, Jan, 2025, Taxonomic Revision and Phylogeny of the Genus Peltocercyon d'Orchymont, 1925 (Coleoptera: Hydrophilidae: Megasternini), Zootaxa 5671 (1), pp. 1-74 : 34-37

publication ID	https://doi.org/10.11646/zootaxa.5671.1.1
publication LSID	lsid:zoobank.org:pub:60D33D8C-BDC2-4C2A-B840-90014815E8CB
DOI	https://doi.org/10.5281/zenodo.16981918
persistent identifier	https://treatment.plazi.org/id/1032930E-FFA3-6B08-FF2C-23A8B581ECE0
treatment provided by	Plazi
scientific name	Peltocercyon rugosipennis Mai, Jia, Ryndevich
status	sp. nov.

Treatment

Peltocercyon rugosipennis Mai, Jia, Ryndevich , Angus & Fikáček sp. nov.

Figs 4C, D View FIGURE 4 , 17A–G View FIGURE 17 , 18A–F View FIGURE 18 , 38A, B, E View FIGURE 38

Type material examined. Holotype: male ( SYSU), “ China: Xizang Autonomous Region, Xigazê / Yadong County, Xiayadong Town , Pangda Village / forest behind the village / 2160 m / 27.3055°N, 89.0058°E / 26–28.VI.2023 / Zuqi Mai, Cheng Liang & Yuezheng Tu leg. // flight intercept trap in primary forest, with rotten jackfruits, bamboo shoots and mushroom around” GoogleMaps Paratypes: 1 male, 1 female ( NMP), same data as the holotype GoogleMaps ; 1 female ( SYSU), “ Xizang, Nyingchi City (= Linzhi ), Medog County / Forest behind the Renqingbeng Temple (仁ª崩*后Ɯ) / 2104 m / 29.3086°N, 95.3471°E / 18.VI.2023 / Zuqi Mai & Wenkai Kou leg. // Primary forest , flight intercept trap with rotten jackfruits, bamboo shoots and human shit around” GoogleMaps

DNA voucher. MZ23: 1 female ( NMP), “ China: Xizang, Nyingchi City (= Linzhi ), Medog County / Forest behind the Renqingbeng Temple (仁ª崩*后Ɯ) / 2104 m / 29.3086°N, 95.3471°E / 18.VI.2023 / Zuqi Mai & Wenkai Kou leg. // Primary forest , flight intercept trap with rotten jackfruits, bamboo shoots and human shit around // DNA isolate: DNA extraction: MZ23, DNA extract stored at Department of Entomology , National Museum, Prague” GoogleMaps

Diagnosis. Length 2.9–3.1 mm. Head and pronotum dark reddish brown; elytra reddish brown to black ( Fig. 17A View FIGURE 17 ). Pronotum with uniform ground punctures ( Fig. 18A View FIGURE 18 ). Elytra opaque ( Fig. 17A View FIGURE 17 ), spaces between ground punctation with microsculpture consisting of very fine dense dots ( Figs 4C, D View FIGURE 4 , 18B View FIGURE 18 ). Mentum with dense coarse punctures and microsculpture ( Fig. 18C View FIGURE 18 ). Posterior tentorial pits not distinctly depressed ( Fig. 18C View FIGURE 18 ). Prosternum tectiform medially; lateral portion without ridge, depressed lateral portions shagreened; prosternal process deeply notched posteriorly ( Fig. 18D View FIGURE 18 ).Antennal grooves of moderate size ( Fig. 18D View FIGURE 18 ). Mesoventral plate spindle-shaped ( Fig. 18E View FIGURE 18 ). Arcuate ridge of metaventrite fine, almost transverse ( Fig. 18E View FIGURE 18 ). Lateral areas of metaventrite with scattered coarse punctures ( Fig. 18E View FIGURE 18 ). First abdominal ventrite with short longitudinal sculpture basally. Male genitalia ( Fig. 17D–G View FIGURE 17 ): Paramere abruptly expanded and obliquely truncate apically; inner face of paramere without fringe of setae ( Fig. 17D, F View FIGURE 17 ). Median lobe slender, widest at the base and gradually narrowing apicad ( Fig. 17E View FIGURE 17 ).

Description. Form and Colour ( Fig. 17A–C View FIGURE 17 ). Total length 2.9–3.4 mm; maximum width 1.7–2.1 mm. Body broadly oval, not parallel-sided in the middle, moderately convex. Dorsum opaque, dark reddish black. Maxillary palpi and labial palpi yellowish brown; antennae yellowish brown with club dark brown. Ventral surface reddish brown to reddish black; ventral face of head, prosternum, epipleura, legs and posterior margins of ventrites are reddish brown, other areas dark reddish black.

Head. Dorsal surface with uniform dense and coarse crescent-shape punctures; interstices smooth. Anterior margin of clypeus with a marginal bead. Eyes of moderate size, separated by ca. 5× the width of one eye. Mentum subtrapezoid, ca. 2.0× as wide as long, slightly depressed anteromedially; anterior margin of mentum slightly concave; with coarse punctures and transverse microsculpture ( Fig. 18C View FIGURE 18 ). Posterior tentorial pits not distinctly depressed ( Fig. 18C View FIGURE 18 ). Antennae with 9 antennomeres; antennal club (antennomeres 7–9) compact and densely pubescent. Maxillary palpomere 2 strongly swollen in apical half, longer than palpomere 3; palpomere 4 almost symmetrical, slightly longer than palpomere 3. Each maxilla with a sucking-disc shaped appendage in male.

Thorax. Pronotum widest posteriorly, gradually narrowed anteriad, with similar crescent-shape punctures as on head. Lateral margins of pronotum narrowly rimmed, the rim overlapping anterior and posterior corners, anterior and almost whole posterior margin without rim. Prosternum gradually raised at middle portion and tectiform medially, with sharp median carina; lateral portion without ridge and shagreened; prosternal process deeply notched posteriorly ( Fig. 18D View FIGURE 18 ). Antennal grooves in moderate size, outer lateral margin moderately convex ( Fig. 18D View FIGURE 18 ). Mesoventral plate spindle-shaped and elongate, surface slightly convex and shining; ca. 6× as long as wide, posterior apex overlapping the anterior ridge of metaventrite in a single point ( Fig. 18E View FIGURE 18 ). Scutellar shield triangular, longer than wide, with punctures finer than those on pronotum. Elytra widest at anterior third; each elytron with 10 rows of punctate striae, striae moderately impressed; striae 6, 8 and 9 not reaching anterior margin of elytron; stria 10 short, only ending at posterior third of elytron; intervals of striae flat, with fine ground punctures, intervals between punctures with very dense and tiny dots ( Fig. 4C, D View FIGURE 4 ). Epipleuron wedge-shaped and strongly oblique at anterior half of elytron. Central area of metaventrite uniformly punctate and bare, lateral areas of metaventrite densely pubescent and with some coarse punctures; anterior ridge of metaventrite only slightly bent backwards and forming an almost transverse ridge; metaventrite with complete femoral lines crossing the anterolateral arcuate ridges and reaching anterolateral corners of metaventrite ( Fig. 18E View FIGURE 18 ). Anterior ridge of metaventrite discontinuous with the arcuate ridge at the crossing point ( Fig. 18E View FIGURE 18 ).

Legs. Profemora bare ventrally, with very fine punctures; mesofemora with coarser setiferous punctures than those on metafemora. Tibiae with small lateral spines. Tarsi with sparse gold ventral setae, first metatarsomere about as long as metatarsomeres 2–3 combined.

Abdomen. Abdominal ventrites densely pubescent. First ventrite sharply carinate medially, with a series of very short longitudinal sculptures basally ( Fig. 18F View FIGURE 18 ).

Male genitalia. Paramere almost the same width from base to apical fourth; strongly expanded and obliquely truncate apically; inner face of paramere without fringe of setae ( Fig. 17D, F View FIGURE 17 ). Phallobase much shorter than parameres; nearly parallel sided, manubrium gradually narrowed and asymmetrical at the base ( Fig. 17D, F View FIGURE 17 ). Median lobe widest at the base, gradually narrowed anteriad; gonopore triangular, situated subapically ( Fig. 17E View FIGURE 17 ). Median projection of sternite 9 slender and rounded at the base; lateral struts slightly longer than median portion ( Fig. 17G View FIGURE 17 ).

Biology ( Fig. 38A, B, E View FIGURE 38 ). Peltocercyon rugosipennis occurs in high mountain forests. We found some living individuals in rotting bamboo shoots.

Etymology. The specific name is derived from the Latin rugosus (rugged) and penne (wing), referring to the rugged and dull elytra of this species.

Remarks. The new species is similar to the Peltocercyon vagus group from Japan in having dull elytra. Peltocercyon rugosipennis sp. nov. can be distinguished from the latter by intervals between elytral ground punctures with dense and very tiny dots ( Fig. 4C, D View FIGURE 4 ) (intervals microreticulate in P. vagus group ( Fig. 4E, F View FIGURE 4 )), paramere strongly expanded and obliquely truncate apically ( Fig. 17D, F View FIGURE 17 ) (paramere slightly expanded and rounded apically in the P. vagus group ( Fig. 29D, F View FIGURE 29 )).