Beris fuscipes Meigen, 1820

Lee, Junho & Suh, Sang Jae, 2022, First record of the soldier fly genus Beris Latreille (Diptera, Stratiomyidae) from Korea, with designation of two new synonyms, Biodiversity Data Journal 10, pp. 80487-80487 : 80487

Beris fuscipes Meigen, 1820

Beris fuscipes Meigen, 1820 - Meigen 1820: 8 (Type-locality: England). ♂ Holotype [MNHN].

Beris sachalinensis Pleske, 1926 - Pleske 1926: 408 (Type-locality: Russia). ♂ Lectotype [ZMAS], synonymised by Pleske 1930.

Beris fuscotibialis Pleske, 1926 - Pleske 1926: 409 (Type-locality: Russia). ♂ Lectotype [ZMAS], synonymised by Nartshuk and Rozkošný 1976.

Beris sychuanensis Pleske, 1926 - Pleske 1926: 411 (Type-locality: China). ♂ Lectotype [ZMAS], synonymised by Nartshuk and Rozkošný 1976.

Beris petiolata Frey, 1961 - Frey 1961: 80 (Type-locality: Japan). 4♀ Syntypes [UZMH], synonymised by Nagatomi and Tanaka 1972.

Materials

Type status: Other material. Occurrence : individualCount: 1; sex: 1 male; lifeStage: adult; Taxon : scientificName: Beris fuscipes; Location : country: Republic of Korea; stateProvince: Gangwon-do ; locality: Pyeongchang-gun , Jinbu-myeon , Jangjeon-ri, Mt. Gariwangsan, 37°28'29"N, 128°31'59"E ; Identification: identifiedBy: J Lee; dateIdentified: 2021; Event: samplingProtocol: malaise trap; eventDate: V/30/2020; Record Level: language: en; institutionCode: KNU; basisOfRecord: PreservedSpecimen Type status: Other material. Occurrence : individualCount: 4; sex: 4 males; lifeStage: adult; Taxon : scientificName: Beris fuscipes; Location : country: Republic of Korea; stateProvince: Gangwon-do ; locality: Pyeongchang-gun , Daegwallyeong-myeon , Hoenggye-ri, Seonjaryeong, 37°41'45"N, 128°45'15"E ; Identification: identifiedBy: J Lee; dateIdentified: 2021; Event: samplingProtocol: malaise trap; eventDate: VI/04/2021; Record Level: language: en; institutionCode: KNU; basisOfRecord: PreservedSpecimen

Description

Male. Body length (excluding antennae): 6.5-7.4 mm; wing length: 5.5-6.1 mm. Head: Black and somewhat sub-shining; compound eyes densely covered with pale brown hairs; occiput and vertex with pale brown recumbent hairs; postocular areas towards lower margin of eye slightly pale pollinose; face black pilose; lower frons with short dark brown to black hairs; antennae short, extreme apex of pedicel slightly tinged with yellowish-brown; flagellum 1.3-1.4 times as long as scape and pedicel combined; flagellomeres 1-2 abruptly swollen, about 1.6-1.8 times wider than pedicel (Fig. 1 B). Thorax: Metallic green, scutum tomentose with pale brown hairs; postpronotal lobe tinged with brown; anepisternum, except anterior and posterior part, lower part of katepisternum and anepimeron, nearly bare. Legs: Mainly yellowish-brown, but the following parts tinged dark brown to black: all coxae, extreme apex of mid-femur, apical half of hind femur, except extreme apex, mid-tibia, except base, middle portion of hind tibia and tarsi (base of fore tarsus slightly paler); hind tarsomere 1 about 1.8-1.9 times wider than hind tibia (Fig. 1 A). Wings: Tinged with dark brown; base of M1 and M2 convergent (Fig. 1 C). Abdomen: Dark brown to black, lateral margin of tergites with conspicuous long yellowish-brown to brown hairs; sterna partly with recumbent pale yellow to yellowish-brown hairs densely; epandrium broad, semi-circular-shaped, posterior margin practically straight; surstyli inserted posterolaterally, feebly curved inwards; cerci parallel-sided and straight; proctiger nearly triangular, apex somewhat rounded (Fig. 1 E); gonocoxite wider than long, posteromedian projection not well-developed, only slightly protruding; gonostyli blunt, not tapering (Fig. 1 D); phallus slender, tripartite; lateral lobes slightly divergent from and slightly longer than median lobe (Fig. 1 F and G).

Female: Specimen unavailable.

Diagnosis

This species can be distinguished from other congeners by the following key diagnostic characters: flagellum short, basal flagellomeres 1-2 (or 1-3) abruptly swollen in both sexes (Fig. 1 B), posterior margin of epandrium with well-developed surstyli (males) (Fig. 1 E); frons about 1/5 to 1/4 of head-width (females) in anterior view ( Rozkošný and Nartshuk 1980:416). This species is particularly similar to the nominate Palearctic species, B. chalybata (Forster, 1771) and B. strobli Dusek & Rozkosny, 1968, but the flagellum of the latter two species is long and not thickened basally, male genitalia without surstyli and the width of frons in the female is about 1/3 of head-width ( Rozkošný 1982).

Distribution

Korea (new record: Gangwon-do), China (Sichuan, Ningxia, Gansu), Japan (Hokkaido, Honshu), Russia (Far East: Siberia), Mongolia, Europe, Canada and USA.

Taxon discussion

According to literature, this species has been reported to have intraspecific variation in the ground colour of antennal segments, hairs on head and thorax, parts of the legs and in wing venation and shape of surstylus ( Woodley 1981, Rozkošný 1982, Woodley 1995). In the Korean specimens, these features are as follows: antennae black, but extreme apex of pedicel yellowish-brown; hairs on frons, face and scutum mainly pale brown to black; M1 and M2 touching proximally, M3 invisible; basal part of femora and tibiae tinged with yellow; surstyli not straight, but curved inwards.

Notes

This Holarctic species is widely distributed in large regions of the Palearctic, Europe to Asia and Nearctic realms, North America. The distributional ranges are as follows: Palearctic: Europe [Central: Austria, Czech Republic, Germany, Hungary, Poland, Slovakia, Switzerland; Northern: Finland, Norway, Sweden; Southern: Italy; Western: France, UK, Ireland; Eastern: Georgia, Roumania, Ukraine] and Asia [Central: Kazakhstan; East: China, Japan, Mongolia, Russia (Far East)]; Nearctic: Canada and USA ( Rozkošný 1982, Woodley 2001).

Figures

Figure 1. Beris fuscipes Meigen, 1820: A. Male habitus, lateral view; B. Male head, lateral view; C. Male wing; D. Genital capsule, dorsal view; E. Epandrium, cerci and proctiger, dorsal view; F. Phallus, dorsal view; G. Ditto, lateral view. Scale bars: A = 1.0 mm; B, C = 0.5 mm; D-G = 0.1 mm.