Strongylophthalmyia sivelli, Zhou & Evenhuis & Yang, 2024

Zhou, Jiale, Evenhuis, Neal L. & Yang, Ding, 2024, Taxonomic review of the Strongylophthalmyia ustulata group (Diptera: Brachycera: Strongylophthalmyiidae) from China, with the descriptions of three new species, Zootaxa 5403 (5), pp. 530-548 : 540

publication ID	https://doi.org/ 10.11646/zootaxa.5403.5.2
publication LSID	lsid:zoobank.org:pub:6BC79A0E-45A6-4685-AAD0-5B3133F098B4
DOI	https://doi.org/10.5281/zenodo.10562321
persistent identifier	https://treatment.plazi.org/id/266487E3-FFA6-4A00-FF2A-1EE9FAFFB7DE
treatment provided by	Plazi
scientific name	Strongylophthalmyia sivelli
status	sp. nov.

Treatment

Strongylophthalmyia sivelli sp. nov.

( Figs 15–20 View FIGURES 15–16 View FIGURES 17–20 , 28 View FIGURES 26–29 , 32 View FIGURES 30–33 )

Type material. Holotype. CHINA: ♂, Hebei, Chengde, Wulingshan, Shibatan , 12 Apr. 2019, Ding Yang leg. ( CAU) . Paratypes. CHINA. 3♀, same collection data as for holotype ( CAU) .

Diagnosis. Generally shining black ( Figs 15, 16 View FIGURES 15–16 ); face yellow, parafacial and apex of frons yellowish brown; antennal arista bicolorous, with yellowish brown basal two thirds and blackish brown apical third ( Fig. 28 View FIGURES 26–29 ); wing slightly infumate, with distinct large dark patch at apex and vague broad median transverse band interrupted along cell r 1 ( Fig. 32 View FIGURES 30–33 ); legs mostly yellow, with fore femur with large blackish brown spot dorsally in apical third, mid and hind femora blackish brown in apical third to half; phallapodeme finely curved inwardly in apical half ( Fig. 20 View FIGURES 17–20 ); distiphallus about 1.81 times as long as phallapodeme, with hook-shaped sclerotized apical “glans” ( Figs 19, 20 View FIGURES 17–20 ).

Description. Male and female ( Figs 15, 16 View FIGURES 15–16 ). Body length 4.2–4.5 mm, wing length 3.8–4.0 mm.

Generally shining black ( Figs 15, 16 View FIGURES 15–16 ). Face yellow; parafacial and apex of frons yellowish brown. Antenna yellowish brown with apical third of arista blackish brown ( Fig. 28 View FIGURES 26–29 ). Proboscis and palpus dark brown. Wing slightly infumate, with large distinct dark patch at apex and vague broad median transverse band at level of dm-m; median transverse band interrupted along cell r 1 ( Fig. 32 View FIGURES 30–33 ); wing veins brown to dark brown. Halter white with base slightly darkened. Legs mostly yellow; fore femur with large blackish brown dorsal spot in apical third ( Figs 15, 16 View FIGURES 15–16 ); mid and hind femora blackish brown in apical third to half ( Figs 15, 16 View FIGURES 15–16 ); tibiae largely dark brown in male ( Fig. 15 View FIGURES 15–16 ), slightly darkened in female with vague dark brown ring on hind tibia ( Fig. 16 View FIGURES 15–16 ); tarsi yellowish brown to dark brown.

Head with frons finely inflated; parafacial with dense silvery tomentose stripe; gena with silvery tomentose stripe along eye margin; postgena bulging. Head chaetotaxy: 1 inner vertical seta, 1 outer vertical seta, 3 fronto-orbital setae, 1 ocellar seta, 1 postocellar seta. Clypeus band-like in male, thick and bulbous in female; palpus elongate, with sparse long dark setulae. Antennal scape with scattered marginal setae and 1 dominant dorsal seta; pedicel with single strong seta dorsally; flagellomere ovate, wider than long, densely covered with short white setulae ( Fig. 28 View FIGURES 26–29 ).

Thorax with mesonotum covered with scattered short golden setulae, in dorsal view with distinct transverse suture. Anepisternum with short setulae on posterior half. Scutellum subtriangular, slightly inflated. Thoracic chaetotaxy: 1 anepisternal seta, 1 notopleural seta, 1 dorsocentral seta, 1 posterior supra-alar seta, 1 scutellar seta. Wing ( Fig. 32 View FIGURES 30–33 ) with R 4+5 and M 1+2 slightly convergent apically; apical section of M 1+2 clearly arched; M 4 reaching wing margin; CuA+CuP closely approaching wing margin; r-m located about basal 0.37 of cell dm; apical section of M 4 shorter than dm-m; alula relatively large; anal lobe slightly narrowed. Legs with dense white setulae.

Abdomen covered with dense long dark setae. Tergite 1 weakly sclerotized. Pregenital sclerites relatively weakly sclerotized.

Male genitalia: Epandrium ( Figs 17, 18 View FIGURES 17–20 ) short and broad, with dense long setae. Surstylus ( Figs 17, 18 View FIGURES 17–20 ) nearly parallel-sided in lateral view, with short stout setae on inner distal surface. Cerci ( Figs 17, 18 View FIGURES 17–20 ) narrow basally, distinctly expanded apically, with one rather long subapical seta and several shorter ones. Hypandrium ( Figs 19, 20 View FIGURES 17–20 ) strongly expanded laterally, with one pair of bifid anterior lobes. Phallapodeme ( Fig. 20 View FIGURES 17–20 ) long, finely curved inwardly in apical half. Pregonite ( Figs 19, 20 View FIGURES 17–20 ) long, narrow, band-like, basally fused to inner surface of hypandrium. Phallic plate ( Fig. 20 View FIGURES 17–20 ) thickened, divided into two articulating sclerites. Distiphallus ( Figs 19, 20 View FIGURES 17–20 ) long, about 1.81 times as long as phallapodeme, with hook-shaped sclerotized apical “glans”, membrane microtrichose. Ejaculatory apodeme ( Figs 19, 20 View FIGURES 17–20 ) relatively short, narrow.

Etymology. The specific epithet is dedicated to the English entomologist Duncan Sivell (The Natural History Museum, London, UK) for his kind support of our study on acalyptrate flies.

Distribution. China (Hebei).

Comparative notes. Strongylophthalmyia sivelli sp. nov. appears to be closely related to S. caliginosa Iwasa, 1992 ( Japan) by sharing the shining black body color and the similar color patterns on the femora. The new species differs from the latter by the following character states: antennal arista yellowish brown in basal two thirds and blackish brown in apical third (yellowish brown in basal third and blackish brown in apical two thirds in S. caliginosa ); palpus dark brown (yellow in S. caliginosa ); mesonotum smooth (coarse, finely wrinkled in S. caliginosa ); apical dark patch of wing relatively small, not reaching apex of R 2+3 and midpoint of apical section of M 1+2 (larger, reaching apex of R 2+3 and midpoint of apical section of M 1+ 2 in S. caliginosa ); median transverse band of wing indistinct, vanished in cell r 1 (well-developed, clearly present in cell r 1 in S. caliginosa ); surstylus less than half of width of epandrium in lateral view (more than two thirds of width of epandrium in S. caliginosa ).