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

description: Penia elongata Arimoto, sp. nov.
(Figures 8, 9)
Etymology. In reference to the elongated body.
Type material. Holotype. Male, Taiwan, Nantou County, Meifeng, 3 II–9 III 2004, C.-S. Lin and W.- T. Yang leg., by malaise trap [NMNST; PEA01].
Male. Diagnosis. This species is characterized by the following features: eyes 0.5 x longer than interocular distance in dorsal view; antennae extending beyond pronotum posterior lateral apices by antennomere VI, surpassing elytral half by antennomere XI; antennomeres II and III similar, short; IV 3.3 x longer than III, 1.8 x longer than II – III combined; aqpical maxillary palpomere 3.7 x longer than wide, longer than maximum eye length; pronotum roundly narrowed and distinctly constricted ahead of hind angles; posterior edge of pronotum without sublateral incisions; hind angles of pronotum acute, strongly protruding posterolaterad; hypomeron without mesial projection; anterior angle of hypomeron biangular, with mesial angle rounded, with outer angle nearly right angle; hind angle of hypomeron narrowly triangular; scutellar shield slightly longer than wide; mesosternal process between mesocoxae a little higher than mesocoxae, slightly visible in lateral view; posterior edge of mesosternal process 0.1 x wider than total width of mesosternum; elytron 5.5 x longer than wide, 5.5 x longer than pronotum length; abdominal ventrite V trapezoidal, rounded posterolaterally, truncate apically; phallobase 0.6 x longer than wide; preapical expansions of parameres claw-like shaped, protruding laterally beyond side of apex; apex of parameres beyond preapical expansions blade-like shaped; apex length 1.8–1.9 x width of parameres at expansions in ventral side.
This species is similar to Penia sucinea Schimmel 1996, which is known from northern Vietnam, in terms of long antennae, a large apical maxillary palpomere, the posterior edge of the pronotum lacking sublateral incisions, the biangular anterior angle of the hypomeron, a narrowly triangular hind angle of the hypomeron, the slightly longer scutellar shielde, the weak developmental mesosternal process between mesocoxae, the elongated elytron, a trapezoidal abdominal ventrite V, a claw-like preapical expansion of the parameres, and the blade-like shape of the apex of the parameres beyond the preapical expansions. It is distinguished from P. sucinea by the following contrasting characters (P. sucinea in parentheses): eyes 0.5 x longer than interocular distance in dorsal view (eyes 0.4 x longer than interocular distance in dorsal view); antennomeres II and III similar, short (antennomere III longer than II); antennomere IV 3.3 x longer than III, 1.8 x longer than II – III combined (antennomere IV 2.6 x longer than III, 1.5x longer than II – III combined), apical maxillary palpomere 3.7 x longer than wide (apical maxillary palpomere 2.7 x longer than wide); hypomeron without mesial projection (hypomeron with distinct mesial projection); anterior mesial angle of hypomeron rounded and anterior outer angle of hypomeron nearly right angle (anterior mesial and outer angles of hypomeron rounded); elytron 5.5 x longer than pronotum length (elytron 4.3 x longer than pronotum length); abdominal ventrite V rounded posterolaterally, truncate apically (abdominal ventrite V round-sided, slightly concave apically); phallobase 0.6 x longer than wide (phallobase 0.9 x longer than wide); apex of parameres beyond preapical expansions 1.7–1.9 x width of parameres at expansions in ventral side (apex of parameres beyond preapical expansions1.25 x width of parameres at expansions in ventral side).
Measurements. BL: 10.7, BW: 3.03, MAE: 1.41, MBE: 0.68, OI: 209, PL: 1.59, PML: 1.42, PW: 2.11, PAW: 1.45, PLI: 75.2, PWI: 145, EL: 8.67, EW: 1.58, EI: 547, BI: 546.
Description. Body elongated, widest behind elytral midlength (Fig. 8A); surface generally smooth but prothorax and abdomen with microstructures; interspaces between punctures distinctly larger than fine puncture diameter (Fig. 8A, B). Color. Body, antennae, and legs brown. External edge of mandible, posterior edges of pronotum, anterior edge of scutellum, anterior edges of elytra and median line of abdomen black. Body covered with long yellow setae.
Head. Frons depressed medially (Fig. 8C); frontal carina not complete (Fig. 8D); frontal margin trapezoidal, almost straight apically in dorsal view (Fig. 8C); frontoclypeal region protruding beyond base of labrum. Eyes protuberant, 0.5 x longer than interocular distance in dorsal view. Antennae extending beyond pronotum posterior lateral apices by antennomere VI, surpassing elytral half by antennomere XI; antennomeres longer than its wide; II obconical, shortest, 1.3 x longer than wide; III obconical, 1.4 x longer than wide, 1.2 x longer than II; IV–XI filiform; IV 4.2 x longer than wide, 3.3 x longer than III, 1.8 x longer than II–III combined (Fig. 8E); V 4.3 x longer than wide, slightly longer than IV; XI 7.5 x longer than wide, 1.1 x longer than X. Mandible bidentate (Fig. 8D). Apical maxillary palpomere elongated securiform, 3.7 x longer than wide (Fig. 8A), longer than maximum length of eyes; anterior edge rounded.
Prothorax. Pronotum hexagonal, 0.75 x longer than wide, roundly widening anteriorly and then roundly narrowed, distinctly constricted ahead of hind angles (Fig. 8A), widest across posterior lateral apices, tallest medially (Fig. 8F), without median longitudinal depression posteriorly; anterior edge weakly concave; anterior angles simple, acute; punctate lateral ridge extending from anterior angles to hind angles (Fig. 8A); hind angles simple, acute, strongly protruding posterolaterad; posterior edge without sublateral incisions, without carinae next to sublateral incisions (Fig. 8A). Hypomeron without mesial projection (Fig. 8G); anterior angle biangular, with mesial angle rounded, with outer angle nearly right angle; mesial edge almost straight; mesial and posterior margins with impunctate ridge (Fig. 8G); posterior margin with triangular projection between two large emarginations; hind angle narrowly triangular. Prosternum strongly incurved ventrally in lateral view; anterior lobe distinctly protruding beyond prosternal ventral line in lateral view (Fig. 8F); anterior edge broadly rounded in ventral view (Fig. 8B). Prosternal process slender, 2.0 x longer than procoxal cavity length, strongly curved dorsad from middle of procoxal cavities in lateral view, without subapical tooth; dorsal lobe roundly expanded ahead of apex in ventral view (Fig. 8H); ventral lobe moderately narrowed posterad toward apex in ventral view (Fig. 8H); ventral edge straight and then weakly curved posterad around apex in lateral view (Fig. 8G); apex rounded in lateral and ventral views (Fig. 8F, H). Pronotosternal sutures not grooved (Fig. 8G), sinuate in ventral view (Fig. 8B), slightly opened anteriorly. Scutellar shield tongue-shaped (Fig. 8I), 1.05 x longer than wide, widest anteriorly, narrowed posteriad but parallel-sided around midlength, flat, inclined anterior-downwards, visible in lateral view (Fig. 8F); anterior edge broadly rounded; posterior edge rounded. Mesosternum: borders of mesosternal cavity straight anteriorly and then curved obtusely ventrad in lateral view (Fig. 8F); mesosternal process between mesocoxae a little higher than mesocoxae, slightly visible in lateral view (Fig. 8F); posterior edge 0.1 x wider than total width of mesosternum, triangularly concave medially (Fig. 8H). Mesepisternum reaching mesocoxal cavity (Fig. 8H). Metasternum sulcate medially and ahead of metacoxal cavities (Fig. 8B). Metacoxal plate narrowed toward outer side, becoming like a parallel-sided bar at its outer 1/ 10 in ventral view (Fig. 8B). Elytron convex but flat in median area, with outer margin narrowly depressed, widest behind midlength, 5.5 x longer than wide, 5.5 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. 8J).
Abdomen. Ventrite V trapezoidal, rounded posterolaterally, truncate apically (Fig. 8B), 0.4 x longer than wide. Tergites and sternites VIII‒X yellow, but posterior part of sternite IX darker. Tergite VIII hexagonal, almost as long as wide, roundly narrowed posterad from around anterior 1/3 and then sub-parallel sided at posterior 1/4; posterior margin widely weakly rounded, but slightly emarginate medially (Fig. 9A). Sternite VIII posteriorly narrowly concave between two projections (Fig. 9B); posterior lateral angle protruding posterad. Tergite IX 1.3 x longer than wide; median notch 1/3 x total length of tergite IX (Fig. 9C). Tergite X longer than wide, rounded apically (Fig. 9C). Sternite IX 2.7 x longer than wide, constricted around anterior 1/3 (Fig. 9D), rounded apically. Aedeagus blackish brown, but apical parts of parameres yellow (Fig. 9E, F). Phallobase 0.2 x total length of aedeagus, 0.6 x longer than wide. Median lobe exceeding apices of parameres by apical 1/10; basal struts 0.2 x total length of median lobe. Parameres broad, not fused ventrally (Fig. 9F); preapical expansions claw-like shaped, protruding laterad (Fig. 9G); apex beyond preapical expansions blade-like shaped (Fig. 9G), strongly constricted behind preapical expansions, with two setae dorsally, with one seta laterally; apex length in ventral side 1.8–1.9 x width of parameres at expansions, 2.6–2.8 x width of parameres beyond constriction behind preapical expansions.
Distribution. Taiwan: Nantou 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 312-315, DOI: 10.11646/zootaxa.5375.3.1, http://zenodo.org/record/10200036