Penia alishanensis Arimoto, 2023

Arimoto, Kôichi, 2023, Taxonomic revision of the genus Penia Laporte (Coleoptera, Elateridae, Dendrometrinae) from Taiwan, Zootaxa 5375 (3), pp. 301-335 : 305-307

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.10201476
persistent identifier	https://treatment.plazi.org/id/03AE8A2D-FFA2-CF62-FF47-EA01FD31FE64
treatment provided by	Plazi
scientific name	Penia alishanensis Arimoto
status	sp. nov.

Treatment

Penia alishanensis Arimoto , sp. nov.

( Figures 2 View FIGURE 2 , 3 View FIGURE 3 )

Etymology. Specific epithet derived from Mt. Ali Shan, the type locality.

Type material. Holotype. Male, Taiwan, Chiayi County, Alishan Township, Mt. Ali Shan , 18 VIII 1977, Y. Watanabe leg. [ NMNST; PAA01 ].

Male. Diagnosis. This species is characterized by the following features: eyes 0.45 x longer than interocular distance in dorsal view; antennae surpassing elytral half by antennomere XI; antennomeres III distinctly longer than II; IV 1.4 x longer than III, 0.9 x longer than II – III combined; apical maxillary palpomere 2.3 x longer than wide, shorter than eye maximum length; hypomeron with distinct mesial projection; anterior angle of hypomeron biangular, with outer angle right angle, with mesial angle rounded; scutellar shield 1.2 x longer than wide; mesosternal process between mesocoxae lower than mesocoxae, not visible in lateral view; posterior edge of mesosternal process 0.1 x wider than total length of mesosternum; elytra 4.5 x longer than wide; abdominal ventrite V curved triangular, rounded apically; phallobase 0.7 x longer than wide; apex of parameres beyond preapical expansions elongated fan-shaped; apex length 2.7 x width of parameres at expansions in ventral side.

This species is similar to P. smetanai in features of the body shape, the eyes, the basal antennomeres, and the mesosternal process between mesocoxae. It is distinguished by the length-to-width ratios of the apical maxillary palpomere and scutellar shield, and the shapes of the hypomeron, abdominal ventrite V and apex of the parameres beyond the preapical expansions (see diagnosis in P. smetanai ).

Measurements. BL: around 7.3 (estimate value), BW: 2.31, MAE: 1.09, MBE: 0.58, OI: 188, PAW: 1.01, EL: 5.19, EW: 1.16, EI: 449.

Description. Body elongated, widest behind elytral midlength ( Fig. 2A View FIGURE 2 ); surface generally smooth; interspaces between punctures distinctly larger than fine puncture diameter ( Fig. 2A, B View FIGURE 2 ) but on elytra intermixed with larger and smaller punctures. Color. Body, antennae and legs orange. Head, median area of pronotum and elytral anterior half darker. External edges of mandible and scutellum, and anterior edge of elytra black. Metasternum and abdomen partly tinged with black. Body covered with long yellow setae.

Head. Frons slightly flatted medially ( Fig. 2C, D View FIGURE 2 ); frontal carina not complete ( Fig. 2C View FIGURE 2 ); frontal margin hexagonal, almost straight apically in dorsal view ( Fig. 2D View FIGURE 2 ); frontoclypeal region protruding beyond base of labrum. Eyes protuberant, 0.45 x longer than interocular distance in dorsal view ( Fig. 2D View FIGURE 2 ). Antennae surpassing elytral half by antennomere XI; antennomeres longer than wide; II globular, shortest, 1.35 x longer than wide; III weakly serrated, 2.3 x longer than wide, 1.8 x longer than II; IV weakly serrated, 3.1 x longer than wide, 1.4 x longer than III, 0.9 x longer than II–III combined ( Fig. 2E View FIGURE 2 ); V–XI filiform; V 3.35 x longer than wide, 1.1 x longer than IV; XI 8.85 x longer than wide, 1.1 x longer than X. Mandible bidentate. Apical maxillary palpomere semicircular ( Fig. 2F View FIGURE 2 ), 2.3 x longer than wide, shorter than eye maximum length; anterior edge rounded.

Prothorax with back half broken and lost ( Fig. 2A, G View FIGURE 2 ). Pronotum roundly widening anteriorly, with punctate lateral ridge; anterior edge concave; anterior angles nearly right angle. Hypomeron with distinct mesial projection ( Fig. 2H View FIGURE 2 : arrow); anterior angle biangular, with outer angle right angle, with mesial angle rounded; mesial and posterior margins with impunctate ridge. Prosternum incurved ventrally in lateral view; anterior lobe distinctly protruding beyond prosternal ventral line in lateral view ( Fig. 2G View FIGURE 2 ); anterior edge broadly rounded in ventral view ( Fig. 2B View FIGURE 2 ). Pronotosternal sutures not grooved, almost straight in ventral view ( Fig. 2B View FIGURE 2 ), slightly opened anteriorly. Scutellar shield tongue-shaped ( Fig. 2I View FIGURE 2 ), 1.2 x longer than wide, widest anteriorly, weakly constricted anteriorly and then narrowed posterad, flat, inclined anterior-downwards, not visible in lateral view; anterior edge slightly broadly rounded; posterior edge rounded. Mesosternum: borders of mesosternal cavity straight anteriorly and then moderately curved in lateral view ( Fig. 2G View FIGURE 2 ); mesosternal process between mesocoxae lower than mesocoxae, not visible in lateral view ( Fig. 2G View FIGURE 2 ); posterior edge 0.1 x wider than total length of mesosternum, weakly emarginate ( Fig. 2J View FIGURE 2 ). Mesepisternum reaching mesocoxal cavity ( Fig. 2J View FIGURE 2 ). Metasternum sulcate medially and ahead of metacoxal cavities ( Fig. 2B View FIGURE 2 ). Metacoxal plate narrowed toward outer side, becoming like a parallel-sided bar at its outer 1/ 10 in ventral view ( Fig. 2B View FIGURE 2 ). Elytron convex but flat in median area, but with outer margin narrowly depressed, widest behind midlength, 4.5 x longer than wide; apex rounded. Hind wings fully developed. Tibiae with paired spurs; relative tarsomere lengths: IV<III II<V<I; tarsomeres III and IV with lobe ventrally ( Fig. 2K View FIGURE 2 ).

Abdomen. Ventrite V curved triangular, rounded apically ( Fig. 2B View FIGURE 2 ), 0.65 x longer than wide. Tergites and sternites VIII‒X yellow. Tergite VIII 1.5 x longer than wide, trapezoidal, narrowed posterad; posterior margin weakly incurved ( Fig. 3A View FIGURE 3 ). Sternite VIII posteriorly widely concave between two projections ( Fig. 3B View FIGURE 3 ). Tergite IX 1.35 x longer than wide; median notch 0.4 x total length of tergite IX ( Fig. 3C View FIGURE 3 ). Tergite X longer than wide, triangular apically ( Fig. 3C View FIGURE 3 ). Sternite IX 3.2 x longer than wide, constricted anterior 2/5 ( Fig. 3D View FIGURE 3 ), rounded apically. Aedeagus yellow ( Fig. 3E, F View FIGURE 3 ). Phallobase 0.2 x total length of aedeagus, 0.7 x longer than wide. Median lobe exceeding apices of parameres by apical 1/20; basal struts 0.15 x total length of median lobe. Parameres slender, not fused ventrally ( Fig. 3F View FIGURE 3 ); preapical expansions protruding anterolaterad ( Fig. 3G View FIGURE 3 ); apex beyond preapical expansions elongated fan-shaped ( Fig. 3G View FIGURE 3 ), with a seta dorsally, with three setae ventrally; apex length 2.7 x width of parameres at expansions in ventral side.