Synchroa medogensis Pan & Wang, 2024

Pan, Zhao & Wang, Shaopeng, 2024, Synchroa medogensis, a new species of Synchroidae (Coleoptera) from Xizang, China, Biodiversity Data Journal 12, pp. e 122792-e 122792 : e122792-

Synchroa medogensis Pan & Wang sp. nov.

Materials

Type status: Holotype. Occurrence: recordedBy: Xinglong Bai; sex: male; lifeStage: adult; occurrenceID: 48E1E27E-7DBF-5D5C-9847-20D2253E3607; Taxon: kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Coleoptera ; family: Synchroidae ; genus: Synchroa ; taxonRank: species; verbatimTaxonRank: sp.; scientificNameAuthorship: Pan & Wang; nomenclaturalCode: ICZN; taxonomicStatus: accepted; nomenclaturalStatus: nov. sp.; Location: country: China; countryCode: China / CN; stateProvince: Xizang; county: Mêdog; locality: Baibung ; verbatimElevation: 754 m; verbatimCoordinateSystem: decimal degrees; decimalLatitude: 29.235938; decimalLongitude: 95.168368; geodeticDatum: GCJ 02; Identification: identifiedBy: Pan Z; Wang S-P; dateIdentified: 2024; Record Level: language: en; basisOfRecord: PreservedSpecimen

Description

Male: body (Fig. 1 A) shiny, completely reddish-brown, antennae and legs darker. Body elongate, slightly flattened, elytra strongly narrowed posteriorly. Body covered with yellowish decumbent long setae. Body length 16.0 mm, width (at humerus of elytra) 4.0 mm.

Head (Fig. 1 B) approximately as long as wide; punctation irregular, larger and denser basally and smaller and sparser apically; interspaces amongst punctures smooth. Eyes prominent, protruding from margin of head, interocular space approximately 1.5 × as wide as eye diameter. Vertex with longitudinal furrows along inner margin of each eye. Last maxillary palpomere subsecuriform. Antennae (Fig. 1 C) filiform, extending back to humerus of elytra, with 11 antennomeres; all antennomeres cylindrical and longer than wide; antennomere I slightly widened at apex, wider than other antennomeres; II shortest; XI longest, approximately 5.7 × as long as maximum width; length ratios of antennomeres I – XI: 1.51: 1.00: 1.79: 2.17: 2.00: 2.08: 1.94: 2.01: 1.92: 1.88: 3.33.

Pronotum (Fig. 1 B) approximately 1.5 × as wide as long, widest near base; punctures with similar size to that on head, gradually denser towards lateral sides; basal angles distinct, slightly projecting; anterior margin almost straight; lateral margins rounded and narrowing anteriad, distinctly bordered at basal 1 / 3 to 1 / 4 (Fig. 1 D); posterior margin bisinuate, with obtuse median lobe; disc with two subrounded impunctate smooth areas on sides of centre, one large shallow depression at centre of base and two deep depressions on sides of base. Elytra elongate, nearly 2.9 × as long as wide, as wide as pronotal width at humeri, narrowed posteriorly, apex rounded; disc covered with oval punctures, denser in lateral and basal part; interspaces wider than puncture diameter. Prosternal process long, bordered laterally, narrowed apically (Fig. 1 E). Mesosternum with shallow, oval mesosternal cavity, moderately punctate (Fig. 1 E). Legs slender; all tibiae and meso- and metatarsomere I with pectinate teeth along apical margin (Fig. 1 F); tibiae with 2 spurs at apex, spurs with micro-teeth along ventral margins (Fig. 1 F), metatibial inner spur approximately 0.3 × as long as metatarsomere I (Fig. 1 F); tarsomeres simple, length ratio of metatarsomeres as follows: 4.31: 1.87: 1.00: 1.56 (Fig. 1 F); pretarsal claws simple, ventral margin smooth (Fig. 1 F).

Abdominal ventrite V subtruncate, with lateral sides nearly straight to slightly rounded, slightly emarginate in middle of posterior margin; tergite VIII (Fig. 1 G) without median strut at apex, slightly emarginate in middle of posterior margin, moderately pubescent apically; sternite VIII (Fig. 1 H) concave in middle of posterior margin, forming two roundly angular lobes on both sides, moderately pubescent apically; sternite IX (Fig. 1 I) without spiculum gastrale on apex; tergite IX and X completely fused, posterior margin rounded and moderately pubescent (Fig. 1 I). Aedeagus (Fig. 1 J – K). Lanceolate; phallobase curved dorsally, lateral sides almost straight and subparallel on apical half, gradually narrowed basically; in dorsal view, parameres stout, approximately 1.1 × as long as phallobase and approximately 2.75 × as long as its maximum width, basal 5 / 6 fused, lateral sides slightly widened medially, gradually narrowed apically; median lobe elongate, tapered, strongly narrowed in apical half.

Female. Unknown.

Diagnosis

This new species resembles Synchroa elongatula Nikitsky, 1999 (from Vietnam and Laos) and S. melanotoides Lewis, 1895 (from Russia, Japan, Korea and China) in the pronotal configuration with lateral margins bordered in posterior 1 / 3 to 1 / 4. Their differential diagnosis is summarised in Table 1 .

Etymology

The name of this new species refers to its type locality, Mêdog County (Xizang, China).

Distribution

China: SE Xizang.

Figures

Figure 1. Synchroa medogensis sp. nov., male, holotype. A habitus, dorsal view; B head and pronotum, dorsal view; C antenna, right; D left side of pronotum, dorsolateral view; E pro- and mesosternum, ventral view; F metatibial apex and spurs and metatarsi, lateral view; G abdominal tergite VIII, dorsal view; H abdominal sternite VIII, ventral view; I abdominal sternite IX and fused tergite IX and X, dorsal view; J – K aedeagus: J dorsal view; K lateral view. Scale bars: 5 mm (A); 0.05 mm (D); 1 mm (others).