Formosargus berezovskiyi, Fachin & Hauser, 2022

Fachin, Diego Aguilar & Hauser, Martin, 2022, Revision of Formosargus James, 1939 (Diptera: Stratiomyidae): five new species in an otherwise rare genus and Amsaria Adisoemarto, 1974 as a generic synonym, Journal of Natural History 56 (37 - 40), pp. 1513-1562 : 1551-1552

publication ID	https://doi.org/ 10.1080/00222933.2022.2117107
publication LSID	lsid:zoobank.org:pub:A6F9B9FB-D3F9-49F2-8FC1-5E6A5E0AB3B1
DOI	https://doi.org/10.5281/zenodo.7324776
persistent identifier	https://treatment.plazi.org/id/561187CD-FFFE-3260-9B82-4DBFFE2F109D
treatment provided by	Plazi
scientific name	Formosargus berezovskiyi
status	sp. nov.

Treatment

Formosargus berezovskiyi View in CoL sp. nov.

( Figures 1 View Figure 1 , 4 View Figure 4 (a), 6(a), 7(e), 9(b), 15(c), 17(e–f), 19(b–c))

Diagnosis (female)

Dark brown pilosity on vertex area and ocellar tubercle ( Figure 6 View Figure 6 (a)); upper frons as wide as long, longer than frontal callus and lower frons combined. Scutal medial band broad, roughly as wide as one-third of scutum ( Figure 7 View Figure 7 (e)), only narrowing at level of transverse suture; mediotergite dark. Abdominal tergites marked with dark brown, a transverse proximal band on tergite 1 and subrectangular spots, narrowed medially, on tergites 2– 5 ( Figure 19 View Figure 19 (b)).

Material examined

HOLOTYPE, 1 ♀ (with puparium pinned beneath label), TAIWAN, Orchid Island, Chungui Bridge , 22.0°N 121.57°E, 20.iv–01.v.1997, V. Berezovskiy, coll. ( LACM) GoogleMaps . PARATYPES, 3 ♀ (1 ♀ with left wing slide-mounted, genitalia dissected and stored in microvial with glycerine) (each puparium pinned beneath label), same data as holotype ( LACM). Two females have an additional label mentioning that each adult emerged from the puparium on 21.v.1997. GoogleMaps

Additional material. 1 ♂, TAIWAN, Orchid Island, Lanyu Weather Station , - 22.037306°S 121.558333°E [Note: male specimen not collected; only known from photograph ( Figure 1 View Figure 1 )] GoogleMaps .

Description

Female. Length (n = 4): body mm, 5.0–6.0; wing mm, 5.0. Head ( Figures 4 View Figure 4 (a), 6(a)). Vertex area as long as ocellar tubercle, with medium dark brown pilosity. Upper frons as wide as long, slightly longer than lower frons; black lateral area of upper frons nearly as wide as ocellar tubercle width, with short dark brown pilosity; anterior margin of upper frons with median triangular extension slightly pointing towards antennal insertion. Fourth flagellomere rounded, as wide as each previous flagellomere. Face slightly shorter than lower frons. Thorax ( Figure 7 View Figure 7 (e)). Medial dark brown band over scutum broad, nearly as wide as one-third of scutum width, homogeneous in width along its entire extension, except for a narrowing at level of transverse suture; pleuron mostly yellowish, with only a small dark brown macula on anepisternum, mediotergite dark brown. Wing ( Figure 9 View Figure 9 (b)). R2+3 originating at r–m level, weakly curved on basal third, nearly straight on apical two-thirds. Abdomen. Tergite 1 with a dark brown transverse band proximally; tergites 2–5 with a pair of dark brown subrectangular spots; only spots of tergite 4 connected medially. Terminalia ( Figures 15 View Figure 15 (c), 17(e–f)). Genital fork equally wide on distal two-thirds, with a subtle widening at level of posterolateral process insertion; posterior, lateral and anterior margins projecting backwards; basal one-third abruptly narrowing into a wide and rounded anterior end; posterior bridge bilobed; posterolateral process wider on basal one-third, narrowing from midway to apex, nearly parallel on distal half; genital opening elliptical.

Male

Only known from a photograph ( Figure 1 View Figure 1 ).

Etymology

The specific epithet is a patronym dedicated to Vladimir V. Berezovskiy, a senior hymenopterist technician at the Entomology Research Museum in Riverside, USA, who first found the larva and identified the specimens in the LACM collection as belonging to Formosargus .

Geographic distribution

Oriental Region. Taiwan (Orchid Island) ( Figure 26 View Figure 26 ).

Comments

This new species is the second species from Taiwan, but it is only found on Orchid Island, while Formosargus kerteszi is reported from the southern tip of the main island, which is the type locality, and now also in the Philippines ( Figure 26 View Figure 26 ). The male of F. berezovskiyi sp. nov., only known from a photograph ( Figure 1 View Figure 1 ), is very similar in the colour pattern to the male of F. kerteszi , with a single medial scutal band, but one important difference, also present in the females, is the shape and width of the band. In F. berezovskiyi sp. nov. it is clearly narrowed at the level of the transverse suture and wider than in other species, as much as one-third the width of the scutum ( Figures 1 View Figure 1 , 7 View Figure 7 (e)), while in F. kerteszi , the scutal band is more linear and thinner ( Figures 7 View Figure 7 (a,b)). Besides these features, females of F. berezovskiyi sp. nov. can be separated from all the other one-striped females by the presence of a black mediotergite and abdominal tergites strongly marked with dark brown ( Figure 19 View Figure 19 (b)).