Cordilura richterae Ozerov & Krivosheina

Ozerov, A. L. & Krivosheina, M. G., 2015, Two new species of the genus Cordilura Fallén, 1810 (Diptera, Scathophagidae) from the Russian Far East, Zootaxa 4040 (4), pp. 489-493 : 491-492

Cordilura richterae Ozerov & Krivosheina , sp. nov. ( Figs. 2–4 )

Material examined. Holotype male, Russia: Sakhalin Oblast, Kuril Islands, Iturup I., Rybaki (45.2076824N 147.8485107E), 23.VI.1968 V. Richter (in ZISP). The holotype is pinned; the left hind leg is missing but otherwise it is in good condition. Paratype male, Russia: Sakhalin Oblast, Kuril Islands, Iturup I., Kurilsk (45.2252N 147.8754E), 25.VI.1968, V. Richter (in ZMUM).

Description. Male. Length of body 6.3–6.4 mm. Length of wing 5.5–5.6 mm.

Head. Frontal vitta yellow, matt; fronto-orbital plate black in upper half and yellow in lower half, whitish dusted. Ocellar triangle black. Face and parafacial whitish. Gena yellow-whitish dusted. Postcranium black, thinly greyish dusted, with black setae in upper third and pale hairs in lower part. Setae: 2 orbitals, 4 frontals, 1 ocellar, 1 inner vertical, 1 outer vertical (approximately 0.5 times as long as inner vertical in paratype and subequal in holotype), 1 small postocellar; 1 pair of strong vibrissae and 1–2 pairs of subvibrissae present. Antenna yellow. Postpedicel rounded apically, approximately 1.5 times as long as wide. Arista yellow, plumose in basal third and the rest bare. Palpus, clypeus and proboscis yellow. Palpus with a long apical seta.

Thorax black, scutum subshining, thoracic sclerites greyish dusted. Acrostichal hairs in two rows, dorsocentrals 3+3 (first presutural short and directed anteriorly), intra-alars 1+1, supra-alars 1+2, 2 postpronotals, 2 notopleurals (the posterior approximately 0.5 times as long as anterior), 2 postalars. Proepisternum with pale hairs and 1–2 black or yellow setae near ventral margin. Proepimeron with 1 yellow seta ventral to spiracle. Anepisternum with a few pale hairs in posterior half and 2 black setae near posterior margin. Katepisternum with black hairs in ventral corner and posterior half, also with 1 strong long black seta in posterodorsal corner. Anepimeron bare. Scutellum with a pair of strong lateral setae and a pair of apical setulae.

Legs. Ground-colour yellow. Coxae of mid and hind legs black, mid and hind tibiae darkened. Fore femur with a row of anterior setae in apical half, additionally with long hairs on ventral surface. Fore tibia with 1 posterodorsal, 1 anterodorsal, 2 posteroventral, 1 dorsal preapical setae, and apicals: ventral, anterodorsal, posterodorsal, anteroventral and posteroventral. Mid femur with an anterodorsal preapical seta, additionally with a long hair basally on ventral surface. Mid tibia with 0–1 anterodorsal, 2–3 posterodorsal, 1–2 posterior, 0–1 anterior setae, and with ring of apicals. Hind femur with 2–3 long hairs ventrally and 1 dorsal preapical setae. Hind tibia with 2–3 posterodorsal, 3–4 anterodorsal setae, 1 dorsal preapical seta, and apicals: anterodorsal, posterodorsal, 0–1 posteroventral (present in holotype and absent in paratype) and anteroventral.

Wing tinged with brownish; veins pale brown. Vein R1 bare. Calypters, including margins, and halter whitish.

Abdomen cylindrical, black, thinly greyish dusted. Syntergite 1+2 with rows of discal and marginal setae, longer on lateral sides; tergites 3–6 each with a row of marginal setae, longer on lateral sides. Male sternites 4 and 5 as in Fig. 2 . Epandrium, cerci and surstyli as in Figs 3, 4 .

Female unknown.

Etymology. The species is named in the honour of the late Russian dipterist Dr. Vera Andreevna Richter, the collector of type specimens, who has made substantial contributions to the study of Asilidae and Tachinidae .

Distribution. Russia: Primorskiy Kray.

Comparisons. The new species resembles Cordilura sidorenkoi Ozerov & Krivosheina, 2012b in the structure of the genitalia and abdominal sternite 5. These species can be distinguished from each other as follows:

1. Coxae of mid and hind legs black, mid and hind tibiae darkened; thorax completely black; apex of wing not darkened; lobes of sternite 5 ( Fig. 2 ) and upper lobe of surstylus ( Figs 3, 4 ) with strong setae ...................................................... C. richterae sp. nov.

- Legs completely yellow; anepimeron and katepisternum yellow; apex of wing darkened; lobes of sternite 5 ( Fig. 5 ) and upper lobe of surstylus ( Figs 6, 7 ) without strong setae ........................................................... C. sidorenkoi Ozerov & Krivosheina, 2012

Within the species known in the Far East of Russia, this new species belongs to the group of species that is characterized as follows: 1) scutellum with a pair of strong basal scutellar setae and a pair of short and thin (setula-like) apical scutellar setae, 2) vein R1 bare, 3) postpronotum with 1–2 setae, and 4) femur of at least mid and hind legs black or blackish.

Cordilura richterae sp. nov. differs from other species of this group as follows:

1. Postpronotum with 1 seta. Palpus black or dark brown .................................................................................................................... 3 - Postpronotum with 2 setae. Palpus yellow ........................................................................................................................................ 2 2. Fore femur yellow. Postpedicel yellow .............................................................................................................. C. richterae sp. nov. - Fore femur black. Postpedicel blackish .................................................................................................... C. zaitzevi Gorodkov, 1974 3. Fore coxa black ................................................................................................................................... C. kakaberrans Ozerov, 1997 - Fore coxa white or yellowish ....................................................................................................................... C. remmi ( Elberg, 1972) Acknowledgements. We are very grateful to Dr. Ol'ga Ovchinnikova and Mrs. Galina Suleymanova for the help with the collection during our work in ZISP. We appreciate the useful suggestions of two anonymous reviewers. The research trip to the Zoological Institute (St. Petersburg) was supported by RFBR, research project No.13-04-01638a. Morphological studies and illustrations for this work were made on equipment purchased with the support of RSF, research project No.14-50-00029.

Figures

FIGURES 2 – 7. Cordilura richterae Ozerov & Krivosheina sp. nov. (2 – 4) and Cordilura sidorenkoi Ozerov & Krivosheina, 2012 (5 – 7): 2, 5 — male sternites 4 (lower) and 5 (upper); 3, 6 — epandrium, cerci and surstyli, dorsal view; 4, 7 — same, lateral view. [Figures 5 – 7 after Ozerov & Krivosheina (2012: Figures 1 – 4)].