Prionocyphon costipennis, Ruta, Rafał, 2010

Ruta, Rafał, 2010, Two new species of Prionocyphon Redtenbacher from Taiwan (Coleoptera: Scirtidae), with notes on Prionocyphon, Mescirtes Motschulsky and Prionoscirtes Champion from East and Southeast Asia, Zootaxa 2402, pp. 52-60 : 53-54

Prionocyphon costipennis sp. nov.

( Figs 1 , 4–9 )

Type material. Holotype, male ( HNHM): “ TAIWAN, Ilan county, / Fushan Botanical Garden. / at light, 21.I.2002. / leg. A. Kun & L. Ronkay” [printed label]; “ HOLOTYPUS / Prionocyphon / costipennis sp. n. / des. Rafał Ruta 2009” [red label, printed].

Diagnosis. Body is moderate in size, somewhat depressed, elytra bear distinct longitudinal carinae, antennae are bicoloured. Parameroids of penis are converging apically, tegmen has wide apices. Similar to P. macrodascilloides sp. nov., but smaller, with more distinct elytral carinae and different genital structures.

Description. Holotype, male. Measurements: TL 3.60, EW 2.20, EL 3.15, PW 1.35, PL 0.60, HW 1.15, greatest depth of body 1.20.

Body elongate, depressed, covered with suberect yellowish setae. Body uniformly testaceous, humeral region slightly lighter, yellowish, antennomeres 1–3 yellowish, 4–6 black (remaining antennomeres missing in the holotype). Body 1.6 times as long as broad.

Head 1.6 times wider than width of interocular space, with subtly rugose punctation, punctures separated by ca. 1.0 diameter, eyes large, finely facetted, strongly protuberant; tempora converging posteriorly. Scape subrectangular, with rounded anterodistal angle, with sharp anterior ridge, 1.5 times as long as wide, antennomere 2 globular, 3 reduced, ca. half as long as antennomere 2, antennomeres 4–6 elongated, of similar lengths, narrowly subtriangular, with somewhat rugose surface. Clypeus wide, transverse, anterior clypeal margin straight, anterolateral angles almost right-angled. Anteclypeus reduced, hardly visible. Labrum small, transverse, with broadly rounded anterolateral angles. Mandibles well developed, symmetrical, each with a sharp mesal denticle.

Pronotum transverse, 2.3 times as broad as long, widest at posterior angles, distinctly narrower than elytral base. Disc of pronotum with subtle granulate punctation (punctures separated by ca. 1.0–1.5 diameter). Posterior margin of pronotum arcuate. Anterior angles explanate, posterior angles almost obtuse, sides of pronotum short, almost straight.

Scutellum subtriangular, with similar punctation to that on pronotum. Angle between pronotum and elytra well marked in dorsal outline. Each elytron with 3 distinct longitudinal ridges, elytra 1.4 times as long as broad and 5.3 times as long as pronotum, sides subparallel in basal half, regularly rounded and converging to apex in posterior half. Humeri well marked. Punctation very strong, deep and dense, distance between punctures ca. 0.3–0.5 diameter. Epipleura narrowed behind metanepisternum, present towards apices. Hind wings fully developed.

Prosternal process lanceolate, ca. 3.5 times longer than wide. Mesocoxae separated by a narrow subparallel process, about 3.5 times as long as broad; metaventral discrimen almost complete, surrounding area somewhat concave. Ratio of ventrites’ lengths 1.0: 2.1: 2.1: 2.4: 2.9. Ventrite 5 regularly rounded, without emargination.

Penis ( Fig. 4 ; L 0.62, W 0.28) symmetrical with broadly oval pala and three processes, which are about as long as pala: mesal subtriangular centema and relatively wide lateral parameroids converging apically, which are slightly longer than centema; tegmen ( Fig. 5 ; L 0.68, W 0.50) large, wide, with long and broad parameres bearing several long setae on inner sides of apices and more numerous setae on outer sides; tergite 8 ( Fig. 6 ; L 0.40, W 0.50) very wide, transverse, with sparse and minute setation at apical margin, apodemes slightly shorter than apical portion; tergite 9 ( Fig. 7 ; L 0.50, W 0.37) with indistinct setae on apical margin, apodemes almost as long as membranous portion; sternite 8 ( Fig. 8 ; L 0.37, W 0.43) small, v-shaped; sternite 9 ( Fig. 9 ; L 0.52, W 0.33) relatively broad, elongate oval, with numerous setae in apical portion.

Female unknown.

Distribution. N Taiwan; known only from the locus typicus. Etymology. Name refers to the distinct longitudinal ridges on the elytra (latin costa = rib, penna = wing).

Figures

FIGURES 1 – 3. Dorsal view: 1) Prionocyphon costipennis sp. nov.; 2) & 3) Prionocyphon macrodascilloides sp. nov. Scale bar (for 1 & 2) = 1.0 mm.

FIGURES 4 – 9. Prionocyphon costipennis sp. nov.: 4) penis; 5) tegmen; 6) tergite 8; 7) tergite 9; 8) sternite 8; 9) sternite 9. Scale bar = 0.25 mm.