Cordilura flavotibialis Ozerov et Krivosheina, 2023

Ozerov, A. L. & Krivosheina, M. G., 2023, A new species of Cordilura Fallén, 1810 (Diptera: Scathophagidae) from Russian Far East, Far Eastern Entomologist 475, pp. 1-5 : 2-4

Cordilura flavotibialis Ozerov et Krivosheina , sp. n.

https://zoobank.org/NomenclaturalActs/ 5124BB25-856A-4F1D-B0D1-3C587B7A1956

Figs 1–3

MATERIAL. Holotype – ♂, Russia: Khabarovsky Krai , Lososina, 49.01º N, 140.33º E, 11–13.VI 2022, leg. N. Vikhrev.

DESCRIPTION. MALE. Head. Frontal vitta black in upper half and yellow in lower half, whitish dusted; fronto-orbital plate black, whitish dusted. Ocellar triangle black. Face pale yellow with whitish reflections. Parafacial pale yellow and gena yellow. Postcranium black, whitish dusted. Setae: 2 orbitals, 2 frontals, 1 ocellar, 1 very long inner vertical, 1 small outer vertical and 1 small postocellar; 1 pair of strong vibrissae present. Antenna black. Postpedicel rounded apically, approximately 1.5–2 times as long as wide. Arista moderately pubescent in basal half. Palpus yellow, with a long apical seta.

Thorax black; scutum subshining, pleural sclerites thinly greyish dusted. Scutum with 2 postpronotal (dorsal about one half of ventral), 1+2 supra-alar (anterior postsutural seta about one half of posterior postsutural seta), 2 postalar, 1 scapular, 1+2 dorsocentral setae; acrostichal setulose in two rows, intra-alar setae absent. Proepisternum covered with pale hairs, without strong setae. Anepisternum with one strong black setae near posterior margin. Katepisternum with pale hairs in ventral corner and 1 strong black seta in posterodorsal corner. Anepimeron bare. Scutellum with a pair of strong lateral setae and a pair of apical setulae.

Legs completely yellow, only femora dorsally in apical half slightly darkened. Fore femur with a row of dorsal setae, and covered with long pale hairs on posterodorsal surface. Fore tibia with 1 posterodorsal, 2 anterodorsal, 2 posteroventral, 1 anterodorsal apical and 2 posterior apical setae. Mid femur with a row of thin anterior setae and with 1 posterior apical seta, additionally with 1 long hair basally on ventral surface. Mid tibia with 1 anterodorsal, 2 posterodorsal, 2 posterior setae, and with a ring of apicals. Hind femur with a row of anterodorsal setae, additionally with 1 long hair basally on ventral surface. Hind tibia with 2 posterodorsal, 3 anterodorsal, 1 anteroventral, 1 dorsal preapical setae, and apicals: posterior, anteroventral, and ventral.

Wing tinged with brownish; veins pale brown. Vein R 1 setulose on apical third of dorsal surface. Calypters, including margins, and halter whitish.

Abdomen cylindrical, blackish, thinly greyish dusted. Syntergite 1+2 with 3–4 lateral and with a row of marginal setae; tergites 3–6 each with a row of marginal setae.

Sternite 4 rectangular about 1.5 times as long as wide; sternite 5 bilobed covered with hairs on internal surface of each conical lobe ( Fig. 1 ). Epandrium, cerci and surstyli as in Figs 2 and 3 .

MEASUREMENTS. Length of body 3.9 mm. Length of wing 4.1 mm.

FEMALE. Unknown.

DIAGNOSIS and COMPARISON. This species is distinguished from congeners noted in Russia (Ozerov & Krivosheina, 2020, 2023) by the following combination of characters: postpedicel unicolor, completely black, approximately 1.5–2 times as long as wide; arista moderate pubescent, longest hairs exceeding greatest diameter of arista; scutellum with a pair of strong discal setae only, the apical scutellars weak, hair-like; legs completely yellow, only femora dorsally in apical half slightly darkened; fore coxa yellowish.

The new species is closely related to Nearctic species C. albicoxa James, 1955 in the structure of surstyli (compare Figs 3 and 4 ), but is distinguished from this species by the colour of antenna and legs. C. albixoxa has "first and second antennal segments brownish yellow, the second yellow above; third black, somewhat paler at the base" and "femora, and middle and hind tibiae black" ( James, 1955).

DISTRIBUTION. Russia: Khabarovsky Krai.

Figures

Figs 1–4. Cordilura flavotibialis sp. n. (1–3) and Cordilura albicoxa James (4), males: 1 – abdominal sternites 4 (lower) and 5 (upper); 2 – epandrium, cerci and surstyli, dorsal view; 3 – same, lateral view; 4 – surstyli, dorsolateral view. (Fig. 4 after James, 1955, fig. 15).