Megarthrus budai Liu and Cuccodoro, 2020
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 |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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