Taxonomy and natural history of the myrmecophilous genus Clinterocera Motschulsky, 1858 (Coleoptera: Scarabaeidae: Cetoniinae) from China and adjacent regions: revision of the C. jucunda species group Author Xu, Hao Author Qiu, Jian-Yue Author Huang, Guo-Hua text Zootaxa 2018 2018-12-13 4531 3 301 352 journal article 27779 10.11646/zootaxa.4531.3.1 4d438ca0-e475-456e-98a1-d45aa4dab121 1175-5326 2614658 59544702-0856-4146-B2D8-A6E2B0BA0D41 Clinterocera jucunda species group Diagnosis. The members of this species group are characterized by elytra flat, without costae; propygidial spiracle distinctly produced; pygidial surface heavily punctate; body surface covered with distinct tomentum in most species; dorsal surface matt, with numerous setiferous punctures. Characterization of the Clinterocera jucunda species group (male). General: Body size small to middle (length 14.3–27.0 mm, width 5.7–10.0 mm). Body surface with dense or sparse, setiferous punctures; setae yellow, short or slender. Dorsal surface usually in orange, orange-red, red, and black; ventral surface black (except metasternum of C. bicolor dark red). Body surface of most species covered with more-or-less golden, khaki, or ashy tomentum; tomentum dull or light colored. Head: Clypeus apical margin raised, frons evenly convex; surface without tomentum or tomentous, with dense or sparse, fine, setiferous punctures; punctures elliptic behind clypeal apex, rounded in frons; setae yellow, short, stubble like. Antenna similar in all species. Antennal scapus strongly expanded, subflabellate; exterior surface tomentous with dense, minute, setiferous punctures; interior surface with many setiferous punctures in margins, setae yellow, slender. Mouthparts (similar in all species): Epipharynx rectangular, brown; lateral bristle crest brown, long ( Fig. 2 ). Mandibles with a cluster of brown, long setae in inner surface; outer surface with sparse, short setae ( Fig. 3 ). Maxillae strongly sclerotized, with several slender, long or short setae; galea curved, elongate, tapering; lacinia knife like; apical portion of cardo with dense, short setae; maxillary palpi dark brown, elongate ( Fig. 4 ). Prementum extremely expanded, scutellate; exterior surface matt, or tomentous with dense, semicircular, setiferous punctures; posterior margin of interior surface with sparse, yellow, long setae ( Fig. 5 ). Gula almost invisible, narrow, clad with sparse, brown, long setae on both sides. Pronotum: Subcircular, margins slightly raised; anterior margin almost straight, slightly convex in medial in dorsal view; disc with abundant to dense, minute, rounded, arcuate-striolate, setiferous punctures; setae yellow, short. Surface lightly, or heavily tomentous, lateral portion with or without a tomentous band. Scutellum: Subtriangular or nearly rounded hexagonal, tomentous. Surface with sparse, fine, arcuate-striolate, setiferous punctures; setae yellow, short. Elytra: Subrectangular; disc largely orange-red, or totally black; juxtascutellar area and elytral declivity black. Surface with abundant to sparse, fine, arcuate-striolae, setiferous punctures, denser in elytral declivity; setae yellow, short. Disc covered with tomentum, or without tomentum; elytral declivity with or without tomentous band; posthumeral portion and the middle of elytral declivity with or without tomentous spot. Metepisternum and metepimeron: More-or-less clad with tomentum in most of species; surface with dense, arcuate-striolate, setiferous punctures. Sternum: Preprosternal apophysis robust, slightly reflexed, with cluster of long setae on the apex. Mesometasternal process absent. Metasternum without tomentum, or with sparse tomentum; surface with dense, arcuate-striolate, setiferous punctures; punctures less dense in middle portion; disc flat. Abdomen: Shallow, longitudinal groove between abdominal sternites III–V. Abdominal sternites surface with dense, fine, arcuatestriolate, setiferous punctures; and sparse, fine, annulate-striolate, setiferous punctures. Surface with or without tomentum, sometimes only in posterior margin of some sternites. Propygidium surface punctate, heavily tomentous; terminal spiracla distinctly protruding. Pygidium: Distinctly convex. Surface with fine, round punctures; usually covered with tomentum. Legs: Mesocoxa almost touching. Surface with dense, fine, sinuous striolae and arcuate, setiferous punctures; setae yellow, short or slender. Tibiae usually slender, but thick in some species. Protibia with a small, external denticle in apical portion; a blunt protrusion near middle of outer margin; an apical tooth of inferior ridge elongate or short, tapering or blunt, curved downwards ( Figs. 28–38 ). Mesotibia and metatibia with a small, acute protrusion near middle of outer margin; three distinct, acute protrusions in distal portion; two spurs thick or slender, acute or blunt ( Figs. 39–61 ). Coxa, trochanter, anterior side of profemora, posterior side of mesofemora and metafemora, dorsal side of tibiae with sparse tomentum. Tarsi with 4 tarsomeres, slender or thick. Propretarsi short, acute. Parameres: Form simple, elongate, apex obtuse in apical view, interparameral split widened, or constricted; apex sharp in lateral view ( Figs. 62–83 ). Sexual dimorphism. Female similar to male, but abdominal sternites convex; terminal abdominal sternite wider; pygidium more convex; blunt protrusion near middle of outer margin of protibia larger; the apical tooth of inferior ridge short and extended distad; tarsi somewhat shorter ( Figs. 39–61 ). Distribution. Oriental Region. Remarks. In the most recent work on the genus Clinterocera , C. hercules Jákl, 2017 was described from Vietnam based on females and placed into the C. jucunda species group ( Jákl 2017 ). After study of external structures and male genitalia, we reassign this species to the C. discipennis species group.