Bolbelasmus (Kolbeus) guangdongensis Liao & Wu 2024, sp. nov.

Bolbelasmus (Kolbeus) guangdongensis Liao & Wu sp. nov. Materials Type status: Holotype. Occurrence: individualCount: 1; sex: male; lifeStage: adult; preparations: whole animal; disposition: in collection; occurrenceID: 9BB93E1A-84F7-5623-AA5F-03D9508A752A; Taxon: kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Coleoptera; family: Geotrupidae; genus: Bolbelasmus; subgenus: Kolbeus; specificEpithet: guangdongensis; taxonRank: species; Location: country: China; countryCode: CN; stateProvince: Guangdong; county: Zhanjiang; locality: Huguangyan National Geopark; verbatimElevation: 26 m; verbatimLatitude: 21.13916 N; verbatimLongitude: 110.28635 E; Identification: identifiedBy: Liao wei-qi, Wu zheng-wei; Record Level: language: en; basisOfRecord: PreservedSpecimen Type status: Paratype. Occurrence: individualCount: 2; sex: 1 female, 1 male; lifeStage: adult; preparations: whole animal; disposition: in collection; occurrenceID: 08BF84F3-2B92-56A9-942C-037EB86557A8; Taxon: kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Coleoptera; family: Geotrupidae; genus: Bolbelasmus; subgenus: Kolbeus; specificEpithet: guangdongensis; taxonRank: species; Location: country: China; countryCode: CN; stateProvince: Guangdong; county: Zhanjiang; locality: Huguangyan National Geopark; verbatimElevation: 26 m; verbatimLatitude: 21.13916 N; verbatimLongitude: 110.28635 E; Identification: identifiedBy: Liao wei-qi, Wu zheng-wei; Record Level: language: en; basisOfRecord: PreservedSpecimen Description Male: Body length 9.5 mm, maximum width 6.8 mm. Form ovate, sides parallel (Fig. 1 A). Colour: dorsum reddish-brown, glossy (Fig. 1 A and C-D). Head: covered with punctures evenly distributed, except on the mandible (Fig. 2). Labrum slightly convex on both sides of the anterior margin, notched on lateral margins, surface rugulate-punctate (Fig. 2). Clypeus trapezoidal, protrusion at basal angle (Fig. 2). Clypeofrontal suture clear, slightly curved, adjacent to the frontal punctate augmentation. Ocular canthi rounded, encircling the eye incompletely, surface rugulate-punctate (Fig. 2). Antennae form lamellalate, orange (Fig. 2). Pronotum: disc maxiumum width approximately 0.7 x as long as body length, anteriorly concave, anterolateral pronotal process rounded, inconspicuous (Fig. 1 A); posterolateral pronotal process transverse, forming a ridge (Fig. 1 A and C). Surface coarsely punctured, banded across the disc, concentrated on the lateral margins, extending towards the middle, gradually thinning out (Fig. 1 A and C). Basal fovea conspicuous (Fig. 1 C). Scutellum: elongate, approximately 0.74 x as wide as long, the lateral margins anteriorly are nearly parallel, posteriorly forming a pinched, sharp angle; surface with scattered nearly invisible punctures (Fig. 1 A). Elytron: semispherical, elytral sutural intervals distinctly convex, thirteen punctate striae distributed on each elytron, uniformly distributed transversely (Fig. 1 A and C). Male genitalia: small , length 1.2 mm, capsule like (Fig. 3 A-C). Phallobase approximately 2.6 x as long as paramere; ventral side evenly sclerotised, with two bands, dorsal side weakly sclerotic, membranous (Fig. 3 B-C). Parameres diverging from each other, subtrapezoidal in shape; basal expansion and lateral margin strongly sclerotised, curving ventrally in a hook-like fashion (Fig. 3 A-C). Median lobe: evenly sclerotised, trilobed, ventral apical part with a half-circular opening (Fig. 3 B-C). Female: length 9.7 mm; maximum width 7.7 mm. Similar to the male, except that the frontal punctate augmentation of the head is replaced by a transverse punctate ridge (Fig. 1 B). Diagnosis Bolbelasmus guangdongensis sp. nov. belongs to the subgenus Kolbeus by pronotal base imarginate (marginate in Bolbelasmus) and scutellum elongate (usually short in Bolbelasmus) (Krikken 1977). This new species resembles Bolbelasmus coreanus, (Kolbe, 1886) (from Korea and China (Krikken 1977, Li et al. 2008)); Bolbelasmus meridionalis Krikkeni Nikolajev, 1979 (from Indonesia, Thailand, China and Vietnam (Krikken 1977) and Bolbelasmus chifengi Wang & Li, 2024 (from China (Li and Wang 2024)) in the body longer, 9 mm (Krikken 1977, Li et al. 2008, Li and Wang 2024) and the frontal tubercle located in junction of clypeofrontal suture (Li and Wang 2024). Their diagnostic characters are summarised in Table 1. Etymology The new species is named after the place where it was collected. Distribution Guangdong Province, China.