Penia pulla Arimoto 2023, sp. nov.
Creators: name: Arimoto, Kôichi
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Elateridae
Penia
Penia pulla

description: Penia pulla Arimoto sp. nov.
(Figures 12, 13)
Etymology. In reference to the dark-colored body than the other Taiwanese species.
Type material. Holotype. Female, Taiwan, Chiayi County, Alishan Township, Mt. Ali Shan, 2300 m, 29–31 V 2004, Jar. Dalihod and Jana Dalihodová Baštová leg. [NMNST; PPA01].
Female. Diagnosis. This species is characterized by the following features: eyes 0.2 x longer than interocular distance in dorsal view; antennae extending beyond pronotum posterior lateral apices by antennomere VIII, not reaching elytral half by antennomere XI; antennomeres III distinctly longer than II; IV 1.3 x longer than III, 0.8 x longer than II – III combined; apical maxillary palpomere 2.1 x longer than wide, shorter than maximum length of eye; pronotum straightly and slightly widening ahead of hind angles; posterior edge of pronotum with sublateral incisions; hind angles of pronotum broad, weakly protruding posterolaterad; hypomeron with slight mesial projection; anterior angle of hypomeron nearly right angle; hind angle of hypomeron broadly triangular; scutellar shield 0.9 x longer than wide; mesosternal process between mesocoxae lower than mesocoxae, not visible in lateral view; posterior edge of mesosternal process 0.15 x wider than total width of mesosternum; elytron 3.7 x longer than wide, 3.2 x longer than pronotum length; abdominal ventrite V semicircular, rounded apically; spiculum ventrale 5.3 x longer than length of sternite VIII; ovipositor longer than length of abdomen.
This species is similar to P. tsou in the feature of the basal antennomeres, the maxillary palpi, the pronotum, the anterior and hind angles of the hypomeron, and the abdominal ventrite V. It is distinguished by its eye size, antenna length, the degree of developments of the mesial projection of the hypomeron and mesosternal process between the mesocoxae, and the length-to-width ratios of the scutellar shield and elytron (see diagnosis of P. tsou).
Measurements. BL: 7.63, BW: 3.01, MAE: 1.28, MBE: 0.90, OI: 141, PL: 1.73, PML: 1.44, PW: 2.40, PAW: 1.42, PLI: 72.3, PWI: 169, EL: 5.53, EW: 1.51, EI: 365, BI: 319.
Description. Body broad, widest behind elytral midlength (Fig. 12A); surface generally smooth; interspaces between punctures distinctly larger than fine puncture diameter (Fig. 12A, B). Color. Body blackish brown. Mandible, labrum, lateral margin of pronotum, external margins of hypomeron and prosternum, and lateral margin of elytra orange, but external edge of mandible, lateral edges of pronotum and elytra, and posterior edge of prosternum blackish brown. Antennae and legs orange, but coxae, trochanters and femora tinged with blackish brown. Body covered with long and whitish yellow setae.
Head. Frons flatted medially (Fig. 12C, D); frontal carina not complete (Fig. 12C); frontal margin semicircular, broadly rounded apically in dorsal view (Fig. 12D); frontoclypeal region protruding beyond base of labrum. Eyes relatively small, 0.2 x longer than interocular distance in dorsal view (Fig. 12D). Antennae extending beyond pronotum posterior lateral apices by antennomere VIII, not reaching elytral half by antennomere XI; antennomeres longer than its wide; II obconical, shortest, 1.5 x longer than wide; III–XI filiform; III 2.6 x longer than wide, 1.5 x longer than II; IV 3.3 x longer than wide, 1.3 x longer than III, 0.8 x longer than II–III combined (Fig. 12E); V 3.4 x longer than wide, slightly shorter than IV; XI 4.15 x longer than wide, 1.1 x longer than X. Mandible bidentate (Fig. 12C). Apical maxillary palpomere securiform (Fig. 12F), 2.1 x longer than wide, shorter than maximum length of eye; anterior edge rounded.
Prothorax. Pronotum hexagonal, 0.7 x longer than wide, roundly widening anteriorly and then straightly and slightly widening ahead of hind angles, widest just ahead of posterior lateral apices (Fig. 12A), tallest medially (Fig. 12G), without median longitudinal depression posteriorly; anterior edge strongly concave; anterior angles simple, nearly right angle; punctate lateral ridge extending from anterior angles to hind angles (Fig. 12A); hind angles simple, broad, weakly protruding posterolaterad; posterior edge with a sublateral incision near each hind angle, without carinae next to sublateral incisions (Fig. 12A). Hypomeron with slight mesial projection (Fig. 12H: arrow); anterior angle nearly right angle; mesial edge weakly sinuate anteriorly and straight posteriorly; mesial and posterior margins with impunctate ridge (Fig. 12H); posterior margin with rectangular projection between two large emarginations; hind angle broadly triangular. Prosternum weakly incurved ventrally in lateral view; anterior lobe distinctly protruding beyond prosternal ventral line in lateral view (Fig. 12G); anterior edge broadly rounded but almost straight apically in ventral view (Fig. 12B). Prosternal process broad, 1.7 x longer than procoxal cavity length, concave between procoxae, strongly curved dorsad from the middle of procoxal cavities in lateral view (Fig. 12G), without subapical tooth; dorsal lobe roundly expanded ahead of apex in ventral view (Fig. 12I); ventral lobe slightly and roundly expanded near base and then abruptly narrowed posterad in ventral view (Fig. 12I); ventral margin weakly and roundly expanded medially in lateral view (Fig. 12G); apex rounded in lateral and ventral views (Fig. 12G, I). Pronotosternal sutures not grooved (Fig. 12H), weakly sinuate in ventral view (Fig. 12B), slightly opened anteriorly. Scutellar shield tongue-shaped (Fig. 12J), 0.9 x longer than wide, widest anteriorly, narrowed posteriad, flat, inclined anterior-downwards, not visible in lateral view (Fig. 12G); anterior edge broadly rounded; posterior edge rounded. Mesosternum: borders of mesosternal cavity nearly straight anteriorly and then obtusely curved ventrad in lateral view (Fig. 12G); mesosternal process between mesocoxae lower than mesocoxae, not visible in lateral view (Fig. 12G); posterior edge 0.15 x wider than total width of mesosternum, slightly emarginate (Fig. 12K). Mesepisternum reaching mesocoxal cavity (Fig. 12K). Metasternum sulcate medially and ahead of metacoxal cavities (Fig. 12B). Metacoxal plate narrowed toward outer side, becoming like a parallel-sided bar at its outer 3/ 10 in ventral view (Fig. 12B). Elytron generally moderately convex, but with outer margin widely depressed, widest behind midlength, 3.7 x longer than wide, 3.2 x longer than pronotum length; apex rounded; elytral striae defined by lines of elongated punctures. Hind wings fully developed. Tibiae with paired spurs; relative tarsomere lengths: IV<III II<V<I; tarsomeres III and IV with lobe ventrally (Fig. 12L).
Abdomen. Ventrite V semicircular, rounded apically (Fig. 12B), 0.4 x longer than wide. Tergite and sternite VIII yellow. Terigite VIII semicircular, 1.15 x longer than wide (Fig. 13A). Sternite VIII (between base of spiculum ventrale and apex) semicircular, 0.7 x longer than wide (Fig. 13B); spiculum ventrale 5.3 x longer than length between base of spiculum ventrale and sternite VIII apex (Fig. 13C). Ovipositor 1.05 x longer than length of abdomen; coxites two segmented at ventral side (Fig. 13D), with several setae each dorsally, ventrally, and apically; stylus with several setae around apex (Fig. 13D). Vagina short; bursa copulatrix broken in holotype, without sclerotized structures (Fig. 13C).
Distribution. Taiwan: Chiayi County (Fig. 1).
description: Published as part of Arimoto, Kôichi, 2023, Taxonomic revision of the genus Penia Laporte (Coleoptera, Elateridae, Dendrometrinae) from Taiwan, pp. 301-335 in Zootaxa 5375 (3) on pages 319-321, DOI: 10.11646/zootaxa.5375.3.1, http://zenodo.org/record/10200036