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| Format: | Recurso digital |
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Zenodo
2021
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| Online adgang: | https://doi.org/10.5281/zenodo.17880395 |
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Indholdsfortegnelse:
- <p><b><i>Trachys quadripennis</i> Peng, new species</b></p><p>zoobank.org/ urn:lsid:zoobank.org:act: 52F1B3D6-64A2-4043-BAC6-58E3497E7890</p><p>(Figs. 15–18)</p><p><b>Type Specimen.</b> Holotype (BPCQ), male, genitalia dissected, mounted on cover slip, and pinned with holotype, labeled: “Zuojiang, altitude 143 m, 22°19′N 107.08′E, Ningming, Guangxi, China, 21-VII-2019, Leg. Yongyi Yuan ”.</p><p><b>Description. Habitus</b> (Fig. 15): Length 2.8 mm, width 1.6 mm; surface uniformly bronze-brown, underside brown with bronze reflections; form very broad and rather quadrate. <b>Head:</b> Widely excavated between eyes; vertex transversely flattened, uniformly covered with dense brown-yellow pubescence with four transversely arranged white pubescent spots; frons depressed along midline, covered with dense, recumbent, brown-yellow pubescence; eyes reniform, genae very short; antennal sockets situated just above lower margins of eyes; clypeus bronze, metallic and shiny; anterior margin widely and deeply emarginate; clypeal suture nearly straight; lateral sides narrowed at midlength; antennae relatively long, reaching slightly past anterior margin of pronotum when laid alongside; antennal scape and pedicel cylindrical, 1.20 times as long as wide; antennomeres 3 <b>–</b> 6 cylindrical, much shorter than scape and pedicel and slightly shorter than remaining apical ones, 1.50 times as long as wide; antennomeres 7 <b>–</b> 11 serrate. <b>Pronotum:</b> 2.95 times as wide as long, widest at base, slightly wider than elytra at base but much narrower than at elytral humeri; lateral margins slightly diverging from base to basal third, then sharply converging to anterior angles; anterior margin semi-rounded without distinct median lobe; both inner and outer basal edges trisinuate, with angulate median lobe; extent of basal margin between outer and inner edges wide and transversely equal; disc convex medially, slightly depressed along basal margin; surface uniformly covered with ocellate sculpture, nearly uniformly clothed with brown-yellow pubescence mixed with nine irregular spots of white pubescence. <b>Scutellar shield:</b> Very small but clearly visible, triangular, smooth. <b>Elytra:</b> 1.30 times as long as wide, 3.90 times as long as pronotum, widest at humeri; anterior two-thirds of elytra rather quadrate; lateral margins slightly diverging from base to humeri, deeply emarginate from humeri to posterior third, then gradually and arcuately converging to apices; apices jointly arcuate without distinct apical and lateral denticles; elytral surface broad, slightly convex; humeri distinctly projecting beyond elytral outline; basal depressions indistinct; entire surface nearly uniformly clothed with brown-yellow pubescence mixed with white pubescent markings but with a transverse glabrous band at posterior third, wider near suture; ornamentation consisting of white pubescence arranged on each elytron as follows: three spots in basal third, an oblique zigzag band at midlength, two transverse bands on posterior half, first one zigzag, apical one transverse. <b>Lateral view</b> (Fig. 17): Thickest point lying at basal third of elytra; maximal thickness slightly exceeding length of head plus pronotum; curvature with angle of 115° between pronotal margin and subhumeral lobe; basal part of elytral margin obliquely straight with angulate angle above metaventrite; humeral carina short, arcuate but rather weak. <b>Underside</b> (Fig. 16): Nearly uniformly covered with short, pale pubescence; prosternal process 1.48 times as long as wide, widest at apical angles; lateral sides parallel in basal half, gradually diverging from midlength to apical angles; apical margin arcuate; surface slightly depressed, smooth, with dense and long, pale pubescence; anterior part of prosternum transverse, narrow, anterior margin slightly emarginate, lateral sides slightly oblique, posterior margin transversely oblique laterally; surface clothed with dense pale and brown-yellow pubescence; hypomeron with a reniform depressed marking on each side, covered with dense micro-wrinkles; metaventrite smooth centrally with ocellate sculpture, near sides with strong reticulate wrinkles, near anterior margin with two arcuate grooves on each side, anterior margin with V-shaped emargination; anterior two abdominal ventrites uniformly and densely covered with round or ocellate sculpture, remaining ventrites rather smooth, ocellate sculpture indistinct; posterior margin of anal ventrite arcuate. <b>Legs:</b> Procoxa and mesocoxa globular, metacoxa expanded as a transverse plate and covered with round ocellate sculpture; all trochanters small, nearly triangular; all femora moderately dilated; all tibiae slender with pale pubescence and soft yellow spines along inner sides; all tarsi bright yellow; each claw with a short, swollen tooth at base. <b>Aedeagus</b> (Fig. 18): Length 0.70 mm, width 0.20 mm; entirely yellow-brown; phallobase long, about 0.4 times the total length; basal knots small or inconspicuous; basal lobe greatly prolonged posteriorly; lateral sides of parameres gradually diverging from base to apical fifth, then very sharply tapering to apices, median lobe cylindrical, rather swollen and acuminate apically. <b>Sexual dimorphism:</b> Female unknown.</p><p><b>Differential Diagnosis.</b> This species is very similar to <i>Trachys taiwanensis</i> Obenberger, 1929, but differs in that the elytra are wider, more quadrate, and nearly uniformly covered with dense brown-yellow pubescence, while in <i>T. taiwanensis</i> the elytra are narrower, more attenuate posteriorly, and covered with only sparse brown-yellow pubescence.The prosternal processes of the two species are also rather different; in <i>T. quadripennis</i> the prosternal process diverges laterally in the apical half and the apical margin is arcuate, while in <i>T. taiwanensis</i> the entire lateral sides are subparallel and the apical margin is rather angulate.</p><p><b>Etymology.</b> The species name is an adjective derived from two Latin words, “quadratus” meaning square or quadrate, and “pennis” meaning wing, referring to the elytral shape of the new species.</p>