Peiyuia Zhu & Shi, 2024

Zhu, Pingzhou, Shi, Hongliang, Liu, Shengdong & Liang, Hongbin, 2024, A new genus and a new species of Sphodrini (Coleoptera: Carabidae) from Changbai Mountain, China, with notes on the tribe, Zootaxa 5519 (1), pp. 90-102 : 93-94

Genus Peiyuia Zhu & Shi , gen. nov.

Chinese common name: 佩ľ±şǎ (Pèi Yù Bù Jiă Shǔ)

Figures. 1–8

Type-species: Peiyuia changbaiensis Zhu & Shi , sp. nov.

Diagnosis. BL = 8.4–8.9 mm. Body more or less depigmented ( Fig. 1 ). Third antennomere without pubescence. Mentum tooth bifid at apex. Pronotal laterobasal setae removed from side margins. Lateral bead of prosternal process absent. Parascutellar setae present. Elytra glabrous, interval 3 with 2 setigerous pores, intervals 5 and 7 without setigerous pores. Elytral microsculpture isodiametric. Metepisternum short. Male protarsomeres dilated. Lateral grooves present on metatarsomeres I–III. Aedeagus left side up in repose; median lobe apical disc absent; apical hook of right paramere present. Gonocoxite II with one ensiform seta at external margin and internal margin respectively; sensory pit absent .

Peiyuia gen. nov. is most similar to the genera Casaleius and Anchomenidius for the small body size, agonoid body shape, depigmented color and apical hook of right paramere, but different by the elytra striae distinct, interval 3 with 2 setigerous pores, pronotal laterobasal setae removed from side margins and parascutellar setae present. The new genus is also similar to Morphodactyla , but can be distinguished by the smaller size and the presence of apical hook on the right paramere.

Generic characters. BL = 8.4–8.9 mm, moderately convex; reddish-brown to dark brown, more or less depigmented. Microsculpture isodiametric on elytra.

Head with eye size typical, moderately prominent laterally; tempora oblique, half as long as eyes; two pairs of supraorbital setae present. Antennae pubescent from fourth antennomere. Labrum smooth, with six setae at anterior margin; mandibles moderately widened, glabrous on outer scrobe and dorsal ridge; terminal maxillary palpomeres and terminal labial palpomeres fusiform in both sexes, not expanded; ligula with apex nearly truncate, with two setae at anterior margin; paraglossae membranous, slightly longer than ligula, glabrous; mentum tooth bifid at apex; submentum with four setae, outer two very short and thin, sometimes unobservable or missed in some specimens.

Pronotum subcordate, glabrous, not beaded at margins. Lateral setae and basolateral setae one pair respectively, removed from side margins.

Elytra oval, glabrous, without humeral tooth. Parascutellar striae well developed and short, between suture and stria 1. Parascutellar pores present; interval 3 with 2 setigerous pores, at middle and apical 1/4 respectively, both adjacent to stria 2; intervals 5 and 7 without setigerous pores.

Ventral. Metepisternum short and wide, length subequal to its width. Prosternal process not marginally beaded.

Legs of typical length, neither markedly slender nor particularly robust. Male protarsomeres 1–3 distinctly dilated, with adhesive hairs well developed. Metacoxa with two setae; metatrochanter with one seta; tarsi without pubescence or wrinkles on dorsal surface, meso- and metatarsomeres I–III with lateral grooves distinct externally and indistinct internally. Claws distinctly pectinate.

Male genitalia. Aedeagus left side up in repose; median lobe apical disc absent ( Fig. 2 ); apical hook of right paramere present ( Fig. 4 ). Endophallus with a small area of fine scales present on left basal side ( Fig. 6 ).

Female genitalia. Gonocoxite II with one ensiform seta at external margin and internal margin respectively; sensory pit absent ( Fig. 7 ).

Distribution. Changbai Mountain, Jilin Province, China.

Etymology. The genus name is a Latinized noun derived from the first name of our esteemed teacher, as well as the first one to discover the type species, Professor Peiyu Yu, to whom this genus is dedicated in honor of her exceptional contributions to the taxonomy of Chinese Carabidae . The gender of this genus name is feminine.

Monophyly and relationships. The new species cannot be arranged to any extant genus, and there are not any certain synapomorphies with other sphodrine taxa. Thus, a new genus is described here. Molecular genetic studies, which include species from all the sphodrine genera may help to resolve these relationships within the morphologically described tribe.

Figures

FIGURE 1. Habitus of Peiyuia changbaiensis Zhu & Shi, gen. nov., sp. nov., Holotype. (A) dorsal view, (B) ventral view.

FIGURES 2–5. Male genitalia of Peiyuia changbaiensis Zhu & Shi, gen. nov., sp. nov., Holotype. 2. median lobe, (A) dorsal view, (B) left ventral view. 3. left paramere. 4. right paramere. 5. sternum IX.

FIGURES 6–8. Peiyuia changbaiensis Zhu & Shi, gen. nov., sp. nov., Paratypes. 6. male endophallus, (A) left ventral view, (B) right ventral view. 7. ventral view of right female gonocoxite II. 8. female reproductive system.