Megarthrus budai Liu and Cuccodoro, 2020

Liu, Zhiping & Cuccodoro, Giulio, 2020, Megarthrus of China. Part 2. Megarthrus basicornis Fauvel, 1904 with description of a new species from Mount Emei (Coleoptera: Staphylinidae: Proteininae), Zootaxa 4895 (1), pp. 124-134 : 130-134

publication ID

https://doi.org/ 10.11646/zootaxa.4895.1.7

publication LSID

lsid:zoobank.org:pub:BF5B9C48-4F1D-4470-9D2A-E3A10193DE49

DOI

https://doi.org/10.5281/zenodo.4324265

persistent identifier

https://treatment.plazi.org/id/03E24614-6475-FF85-3B8F-FF259F8C3D5D

treatment provided by

Plazi

scientific name

Megarthrus budai Liu and Cuccodoro
status

sp. nov.

Megarthrus budai Liu and Cuccodoro View in CoL , sp. nov.

( Figs 8-9 View FIGURES 6-9 , 12-39 View FIGURES 10-13 View FIGURES 14-16 View FIGURES 17-26 View FIGURES 27-32 View FIGURES 33-38 View FIGURE 39 )

urn:lsid:zoobank.org:act:836693E2-8AB5-4D0C-99A7-F61FAE36CD25

Type material. Holotype, male “ China: Sichuan, Emei Shan , N29°33’00’’ E103°21’38’’, 28.v.2011, 1639m, sift08, V. Grebennikov ”( MHNG). GoogleMaps

Paratypes: same data as holotype, 1 male in SWUC GoogleMaps and 3 females, in MHNG ; “ China, Sichuan, Emei Shan , N29°33’04’’ E103°21’19’’, 25.v.2011, 1729m, sift05, V. Grebennikov ”, 1 male and 5 females in MHNG GoogleMaps and 1 female in SWUC .

Description. Habitus as in Figs 14-16 View FIGURES 14-16 . Combined length of head, pronotum, and elytra 1.7-1.9 mm; maximal pronotal width 0.9-1.1 mm. Body predominantly chestnut brown, with head darker and appendages slightly paler, and lateral portions of pronotum markedly paler. Dorsal pubescence fairly uniform, but denser on basal portion of elytra; pubescence on frons converging, with medial setae directed backward; metaventral setae shorter than proventral setae, becoming longer anteriorly; pubescence on abdominal tergites IV-VII parallel; sternites IV-VII with few longer setae posteromedially, but apparently lacking macrosetae. Frons and vertex finely granulate; pronotum and elytra granulo-fossulate; prohypomeron almost smooth ( Fig. 9 View FIGURES 6-9 ); metaventrite coarsely punctate laterally, almost smooth in middle.

Frons above clypeus forming sharp ridge, the latter very finely carinate; mesal portion of disc weakly convex in lateral view, evenly; U-shaped frontal impression shallow. Temples slightly expanded just behind eyes, then abruptly narrowed, almost smooth. Occipital ridge indistinct. Antenna ( Fig. 32 View FIGURES 27-32 ) with scape fairly conical, not compressed; short and dense pubescence present only on antennomeres 5-11; antennomere 11 rather ovoid, slightly compressed. Pronotum as in Fig. 8 View FIGURES 6-9 ; hypomera lacking transverse ridge ( Fig. 9 View FIGURES 6-9 ). Scutellum with anterior margin rounded. Elytral disc without notable relief.

Male. Frontoclypeal area, protarsomere 5, metaventrite, and abdominal sternites IV-VI unmodified. Protarsomere 1 possessing ventral patch of modified adhesive setae ( Figs 12-13 View FIGURES 10-13 ). Metatarsomere 1 about 1.3 times as long as combined length of metatarsomeres 2-4. Peg-like setae absent from protrochanter, metatrochanter, femur, and protibia; arranged in a row on mesotrochanter ( Fig. 19 View FIGURES 17-26 ); grouped in a field on mesotibiae ( Figs 23-24 View FIGURES 17-26 ) and metatibiae ( Figs 25-26 View FIGURES 17-26 ). Metaventrite markedly swollen in middle. Abdominal tergite VIII as in Figs 20, 22 View FIGURES 17-26 ; sternite VIII as in Fig. 17 View FIGURES 17-26 ; hemitergites IX as in Fig. 29 View FIGURES 27-32 ; sternite IX without subbasal medial protuberance. Aedeagus as in Figs 27-28, 30-31 View FIGURES 27-32 .

Female. Abdominal tergite VIII ( Figs 37-38 View FIGURES 33-38 ) forming a medioapical projection; sternite VIII as in Fig. 36 View FIGURES 33-38 . Genitalia as in Figs 33-35 View FIGURES 33-38 .

Comparisons and diagnostic notes. In the Palaearctic and Oriental regions Megarthrus budai is easily distinguished from its congeners by its deplanate pronotum in combination with the absence of a hypomeral ridge, the presence of short and dense pubescence only on the antennomeres 5-11, and the scape fairly conical and not compressed. Its sexual characters are also diagnostic. The new species possesses a ventral patch of modified adhesive setae on the male protarsomere ( Figs 12-13 View FIGURES 10-13 ), a feature uniquely shared in the genus by all the members of the M. depressus supergroup ( Cuccodoro 2011). However, neither the shape of its aedeagus nor the male modifications of the legs resemble any of the species currently included in this main lineage of Megarthrus , and thus its affinities remain unclear.

Distribution and natural history. Megarthrus budai sp. nov. is endemic to Mount Emei of Sichuan province in China ( Fig. 39 View FIGURE 39 ), where it was collected from sifted litter, at elevations ranging from approximately 1600 to 1750 m a.s.l.

Etymology. The new species is named after the tenth-century Buddhist monk Budai, famous for his representations with a laughing face and round stomach, with reference to the swollen metaventrite of the males of this species. Name in apposition.

MHNG

Museum d'Histoire Naturelle

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

SubFamily

Proteininae

Genus

Megarthrus

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