Penia pulla Arimoto, 2023

Arimoto, Kôichi, 2023, Taxonomic revision of the genus Penia Laporte (Coleoptera, Elateridae, Dendrometrinae) from Taiwan, Zootaxa 5375 (3), pp. 301-335 : 319-321

publication ID	https://doi.org/ 10.11646/zootaxa.5375.3.1
publication LSID	lsid:zoobank.org:pub:27D02F09-01B7-457A-8A99-D8644B7B6ADE
DOI	https://doi.org/10.5281/zenodo.10201488
persistent identifier	https://treatment.plazi.org/id/03AE8A2D-FFB4-CF70-FF47-EB8CFD31FCF8
treatment provided by	Plazi
scientific name	Penia pulla Arimoto
status	sp. nov.

Treatment

Penia pulla Arimoto sp. nov.

( Figures 12 View FIGURE 12 , 13 View FIGURE 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 View FIGURE 12 ); surface generally smooth; interspaces between punctures distinctly larger than fine puncture diameter ( Fig. 12A, B View FIGURE 12 ). 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 View FIGURE 12 ); frontal carina not complete ( Fig. 12C View FIGURE 12 ); frontal margin semicircular, broadly rounded apically in dorsal view ( Fig. 12D View FIGURE 12 ); frontoclypeal region protruding beyond base of labrum. Eyes relatively small, 0.2 x longer than interocular distance in dorsal view ( Fig. 12D View FIGURE 12 ). 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 View FIGURE 12 ); 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 View FIGURE 12 ). Apical maxillary palpomere securiform ( Fig. 12F View FIGURE 12 ), 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 View FIGURE 12 ), tallest medially ( Fig. 12G View FIGURE 12 ), 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 View FIGURE 12 ); 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 View FIGURE 12 ). Hypomeron with slight mesial projection ( Fig. 12H View FIGURE 12 : arrow); anterior angle nearly right angle; mesial edge weakly sinuate anteriorly and straight posteriorly; mesial and posterior margins with impunctate ridge ( Fig. 12H View FIGURE 12 ); 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 View FIGURE 12 ); anterior edge broadly rounded but almost straight apically in ventral view ( Fig. 12B View FIGURE 12 ). 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 View FIGURE 12 ), without subapical tooth; dorsal lobe roundly expanded ahead of apex in ventral view ( Fig. 12I View FIGURE 12 ); ventral lobe slightly and roundly expanded near base and then abruptly narrowed posterad in ventral view ( Fig. 12I View FIGURE 12 ); ventral margin weakly and roundly expanded medially in lateral view ( Fig. 12G View FIGURE 12 ); apex rounded in lateral and ventral views ( Fig. 12G, I View FIGURE 12 ). Pronotosternal sutures not grooved ( Fig. 12H View FIGURE 12 ), weakly sinuate in ventral view ( Fig. 12B View FIGURE 12 ), slightly opened anteriorly. Scutellar shield tongue-shaped ( Fig. 12J View FIGURE 12 ), 0.9 x longer than wide, widest anteriorly, narrowed posteriad, flat, inclined anterior-downwards, not visible in lateral view ( Fig. 12G View FIGURE 12 ); 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 View FIGURE 12 ); mesosternal process between mesocoxae lower than mesocoxae, not visible in lateral view ( Fig. 12G View FIGURE 12 ); posterior edge 0.15 x wider than total width of mesosternum, slightly emarginate ( Fig. 12K View FIGURE 12 ). Mesepisternum reaching mesocoxal cavity ( Fig. 12K View FIGURE 12 ). Metasternum sulcate medially and ahead of metacoxal cavities ( Fig. 12B View FIGURE 12 ). Metacoxal plate narrowed toward outer side, becoming like a parallel-sided bar at its outer 3/ 10 in ventral view ( Fig. 12B View FIGURE 12 ). 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 View FIGURE 12 ).

Abdomen. Ventrite V semicircular, rounded apically ( Fig. 12B View FIGURE 12 ), 0.4 x longer than wide. Tergite and sternite VIII yellow. Terigite VIII semicircular, 1.15 x longer than wide ( Fig. 13A View FIGURE 13 ). Sternite VIII (between base of spiculum ventrale and apex) semicircular, 0.7 x longer than wide ( Fig. 13B View FIGURE 13 ); spiculum ventrale 5.3 x longer than length between base of spiculum ventrale and sternite VIII apex ( Fig. 13C View FIGURE 13 ). Ovipositor 1.05 x longer than length of abdomen; coxites two segmented at ventral side ( Fig. 13D View FIGURE 13 ), with several setae each dorsally, ventrally, and apically; stylus with several setae around apex ( Fig. 13D View FIGURE 13 ). Vagina short; bursa copulatrix broken in holotype, without sclerotized structures ( Fig. 13C View FIGURE 13 ).