Hesperopenna bakeri Bezdek & Kopr, 2024

Bezdek, Jan & Kopr, David, 2024, Two new species of Hesperopenna Medvedev & Dang, 1981 (Coleoptera, Chrysomelidae, Galerucinae) from Singapore, ZooKeys 1192, pp. 45-56 : 45

Hesperopenna bakeri Bezdek & Kopr sp. nov.

Figs 1E-F , 3

Type locality.

Singapore, approx. 1°17'N, 103°51'E.

Type material.

Holotype: ♂ (USNM), "Singapore / Coll. Baker [printed white label]". Paratypes: 2 ♀♀ (USNM), same label as holotype. The specimens are provided with additional printed red label: "HOLOTYPUS, [or PARATYPUS] / Hesperopenna / bakeri sp. nov., / J. Bezděk & / D. Kopr det. 2023 [printed red label]".

Description.

Body length: ♂: 5.6 mm (holotype), ♀♀: 5.1-5.8 mm. Body elongate oval, moderately convex, and glabrous. Body orange brown, except darkened apices of mandibles. Antennomeres I-II orange, III-VI black, VII dark brown, VIII-XI brown. Legs brown with black tibia and first two tarsomeres.

Male (holotype, Fig. 1E-F ). Head with transverse rectangular labrum, with rounded anterior angles, anterior margin straight and shallowly emarginated in middle, surface with six pores in transverse row, each bearing long, pale seta. Anterior part of head slightly convex, lustrous and nearly glabrous, with several setae along anterior margin and close to eyes, anterior margin slightly concave. Interantennal space narrow, 0.71 times as wide as transverse diameter of antennal socket. Interocular space 1.35 times as wide as transverse diameter of eye. Frontal tubercles transverse, outer parts narrow and transverse, subtriangular medially, moderately elevated, lustrous, and separated by thin, shallow groove. Vertex glabrous, lustrous, impunctate, separated from frontal tubercles by shallow bent line. Antennae filiform, 0.80 times as long as body, length ratios of antennomeres in sequence from first equals 100-26-52-87-87-87-87-83-83-69-83 (100 = 0.6 mm). Antennomeres I-II almost glabrous, with several long setae, III-XI densely covered with short recumbent setae mixed with sparse longer setae.

Pronotum transverse, 1.35 times as wide as long, widest in middle. Surface lustrous, glabrous, covered with indistinct punctures, moderately convex, with shallow impressions from anterior angles parallel with anterior margin. Anterior margin straight, lateral margins rounded, posterior margin moderately rounded. Anterior margin unbordered, lateral and posterior margins distinctly bordered. Anterior angles distinctly swollen, posterior angles obtusely angulate, each angle with setigerous pore bearing long seta. Scutellum small, triangular with rounded apex, impunctate, and glabrous.

Elytra 1.60 times as long as wide (measured at widest, in posterior third) and 0.71 times as long as body. Surface glabrous except very scarce short setae on apical slopes and on lateral and apical margins, densely covered with very small, confused punctures. Humeral calli developed. Epipleura lustrous, glabrous, smooth, widest at anterior third, gradually narrowed towards elytral apex. Macropterous.

Procoxal cavities open behind. Last abdominal ventrite with well visible impressed furrows forming subtriangular plate, posterior margin of last abdominal ventrite nearly straight. Abdomen covered with sparse setae, plate on last abdominal ventrite with longer and denser setae (Fig. 3L ). All legs densely covered with short recumbent setae. Apices of meso- and metatibiae with spine. Protarsomere I elongated subtriangular, slightly wider than small and triangular protarsomere II, length ratio of protarsomeres I-III and V equals 100-66-66-111 (100 = 0.20 mm). Mesotarsomere I elongated triangular, as wide as triangular mesotarsomere II, length ratio of mesotarsomeres I-III equals 100-50-41 (100 = 0.25 mm) (mesotarsomere V missing). Metatarsomere I long, narrow, slightly wider apically, length ratio of metatarsomeres I-III and V equals 100-41-35-65 (100 = 0.4 mm). Claws appendiculate.

Penis (Fig. 3A-H ) elongate, parallel, 3.90 times as long as wide, dorsal side with two partly overlapping plates anteriorly forming two widely rounded processes. Apex triangular, strongly bent downwards. In lateral view, penis moderately bent. Penis with one long robust internal sclerite with apex bent upwards and covered with complicated structure.

Female. Last abdominal ventrite without impressed furrows forming subtriangular plate, posterior margin widely rounded with very small apical emargination (Fig. 3M ). Apex of pygidium with wide shallow emargination (Fig. 3N ). Spermatheca with spherical nodulus and C-shaped cornu, narrowed basally, terminated by wide appendix (Fig. 3K ). Sternite VIII shovel-like, with widely rounded apical margin, with setae cumulated on and along apical margin, tignum narrow, slightly bent, 1.33 times as long as sternite VIII (Fig. 3I ). Gonocoxae long, 9.50 times as long as wide, distinctly narrowed in middle part, with split apex, apical part with several long setae, base with two short thin processes (Fig. 3J ).

Differential diagnosis.

Having brown legs with black tibia and first two tarsomeres Hesperopenna bakeri sp. nov. is similar to H. tibialis (Kimoto, 1989) from Laos, Thailand and Peninsular Malaysia, and H. zofka Bezděk, 2013 from Indonesia (Java, Bali) from Hesperopenna medvedevi species group (see Bezděk 2013), and also to H. vietnamica (Medvedev, 2000), and some specimens of H. thailandica (Kimoto, 1989) with black tibia from Hesperopenna vietnamica species group (see Bezděk 2016). Hesperopenna tibialis and H. zofka are large species with body length more than 6.8 mm while the body length of H. bakeri sp. nov. is 5.6-5.8 mm. Hesperopenna bakeri sp. nov. has less transverse pronotum, 1.35 times as wide as long, while pronota of H. vietnamica and H. thailandica are more transverse, 1.75-1.85 times as wide as long. Penis of H. bakeri sp. nov. (Fig. 3A-H ) has dorsal side with two wide partly overlapping plates, the apex is triangular, strongly bent downwards, and endophallic sclerite is robust. Penis of H. tibialis and H. zofka is robust, with two endophallic sclerites (one very large, with spoon-like apex and distinct ridges ventrally, second thin, usually hidden inside the aedeagus - see figs in Bezděk 2013), and that of H. vietnamica and H. thailandica has two thin lateral processes with very deep incision between them, ventral side of penis apically with hook-like process, and endophallic sclerite thin (see figs in Bezděk 2016).

Distribution.

Singapore.

Etymology.

Dedicated to Charles Fuller Baker (1872-1927), an American entomologist, botanist and agronomist, who collected the type series.

Figures

Figure 1. Habitus, dorsal view A Hesperopenna temasek sp. nov., holotype, male B H. temasek sp. nov., holotype, labels C H. temasek sp. nov., paratype, female D H. temasek sp. nov., paratype, labels E H. bakeri sp. nov., holotype, male F H. bakeri sp. nov., holotype, labels.

Figure 3. Diagnostic characters of Hesperopenna bakeri sp. nov. A penis, dorsal view B penis, apical part C penis, lateral view D penis, ventral view E penis, dorsal view, drawing F penis, apical part, drawing G penis, lateral view, drawing H penis, ventral view, drawing I sternite VIII, female J gonocoxae K spermatheca L last visible abdominal ventrite, male M last visible abdominal ventrite, female N pygidium, female.