Dryope decrepita ( Zetterstedt, 1838 )

Jia, Lei, Fu, Wanqin & Shi, Li, 2022, A genus and three species of Dryomyzidae newly recorded from China (Diptera), Zoological Systematics 47 (4), pp. 320-331 : 324-326

Dryope decrepita ( Zetterstedt, 1838) ( Figs 3−5 )

Dryomyza decrepita Zetterstedt, 1838: 737 ; Zetterstedt, 1846: 2085.

Dryope decrepita : Mathis & Sueyoshi, 2011: 207 (catalogue); Ericson & Hellqvist, 2013: 2; Hagenlund & Kvifte, 2015: 199; Zinchenko, 2021: 204.

Dryomyza dayi Cresson, 1920: 34 .

Dryomyza ferruginea Melander, 1920: 311 .

Description. Body length 6.1–6.3 mm in male, 6.1–6.2 mm in female; wing length 6.0– 6.4 mm in male; 5.4–5.5 mm in female. Body ( Figs 3A , 5A–B ) pale yellow to deep yellow.

Head ( Figs 3B–D ). Frons pale yellow hairy on anterior half and deep yellow on posterior half, wider than long, anterior frontal margin shallowly emarginated, exposing the lunule and antennal bases; two upper fronto-orbital setae retroverted, anterior fronto-orbital seta hair-like, shorter than posterior fronto-orbital seta. Ocellar triangle shining, ocellar setae developed, extending forward and close to frontal margin, divergent apically; postocellar setae parallel; rows of setulae scattering between anterior ocellar and postocellar setae. Face concaved medially. Gena three quarters height of eye, with several setulae, without genal setae. Antenna with short scape and pedicel, pedicel twice as long as scape, and first flagellomere brownish (sometimes brownish yellow at one-third base) and elongated oval; arista black with sparse rays twice as long as basal width of arista. Clypeus, palpus and proboscis pale yellow.

Thorax ( Figs 3E–F ). Mesonotum with a pair of brown slender medial stripes, a pair of pale brown triangular patch before transverse suture, and a pair of brown thin stripes beyond transverse suture, and 0+2 dorsocentral setae, postsutural intra-alar seta absent, 2 short setulae before supra-alar seta, 1 proepisternal seta, 3 katepisternal setae along upper margin of katepisternum. Scutellar suture thin black. Legs with apex of mid and hind femora pale brown, tarsomeres 1–2 brownish yellow and tarsomeres 3–5 dark brown. Fore tibia with 1 thin preapical dorsal seta and 1 thin apicoventral seta. Mid tibia with 2–3 strong posterior dorsal setae in male (absent in female), 1 preapical dorsal seta and a horizontal row of strong apicoventral setae. Hind tibia with a thin preapical dorsal seta, 1 apicoventral seta. Wing ( Fig. 3J ) pale yellow hyaline, with narrow brown spots on r-m and dm-cu, and R 1 without dorsal setulae along entire length, vein M 1+2 not curved forward in ultimate section and parallel with R 4+5.

Abdominal tergites ( Figs 3H–I , 5A ) 1 and 5 dark brown in the middle, and tergites 2–4 dark brown to black in dorsal view. Male genitalia ( Figs 4A–E ) with epandrium broaden, anterior epandrial process rod-shape, distinctly shorter than surstylus and bending outward distally; surstylus widen basally with 3 basal setae, narrow and bending inward apically; hypandrium being composed of two broaden sclerites separated each other, hypandrial apodeme absent; pregonite broad with 3 setae, postgonite broaden; distiphallus long, with densely hairy between basal one third and apical one third, and rough patches on apical one third of one side. Female terminalia ( Figs 5C–E ) with tergite 8 and sternite 8 fused like a circle, sternite 9 divided medially with sparse short spines at apex (similar structure occurred to the sternite 8 of the species Paradryomyza steyskali Ozerov & Sueyoshi, 2002 (figs 4a–b)); spermathecae rounded, 2+2.

Material examined. China, Inner Mongolia, Hulunbeir, Jinhe, Hanma National Nature Reserve , Ginamijima River , wetland, 1♂, Malaise-traping , 932 m, 19 October 2015, Shen, R. R. leg .; China, Inner Mongolia, Hulunbeir, Jinhe, Hanma National Nature Reserve , 200m stream plank road of central management station, 1♂ 2♀, Malaise-traping , 835 m, 28 August 2015, Shen, R. R. leg .

Distribution. China (Inner Mongolia), Russia, Finland, Norway, Poland, Sweden, Czech Republic, Slovakia, Austria, Germany, Switzerland, Netherlands, Belgium, Britain, Ireland, Canada, USA.

Remarks. Both the genus and the species are reported in China for the first time. The sequence of the cytochrome oxidase I (COI) of this species was uploaded to NCBI and deposited in GenBank under accessions OL851803 ( Dryope decrepita ).

Figures

Figure 3. Dryope decrepita (Zetterstedt, 1838), male (A–H) and female (I–J). A. Habitus, lateral view; B–D. Head, anterior, dorsal and lateral view; E–F. Thorax, dorsal and lateral view; G–H. Abdomen, dorsal and lateral view; I. Abdomen, lateral view; J. Wing. Scale bars=1mm.

Figure 4. Dryope decrepita (Zetterstedt, 1838), male genitalia. A. Syntergosternite, epandrial and phallic complex, lateral view; B. Epandrial and phallic complex, lateral view; C. Syntergosternite, epandrial and phallic complex, ventral view; D. Epandrial complex, posterior view. Scale bars=0.1mm.

Figure 5. Dryope decrepita (Zetterstedt, 1838). A–B. Habitus, lateral view, female and male; C–E. Female postabdomen, lateral, dorsal and ventral view. Scale bars: A–B=1mm; C–E=0.1mm.