Chrysotus masunagai Negrobov, Kumazawa & Tago, 2016

Negrobov, Oleg P., Kumazawa, Tatsunori, Tago, Toshihiro & Fursov, Viktor N., 2016, Species of the genus Chrysotus Meigen, 1824 (Diptera: Dolichopodidae) from Japan, with descriptions of two new species, European Journal of Taxonomy 197, pp. 1-15 : 4-6

Chrysotus masunagai Negrobov, Kumazawa & Tago , sp. nov.

urn:lsid:zoobank.org:act:CA904F5D-F488-4B95-B043-0D598C014071

Figs 1 , 5A

Chrysotus sp. 2t – Tago 2010: 43.

Diagnosis

Face narrow; postpedicel small; lower postocular setae white; fore coxa with black hairs; femora mostly yellow; mid tibia with 2 anterodorsal and 2 posterodorsal setae; hind femur and with long setae, hind tibia with short hairs; phallus with two lateral processes on tip.

Etymology

The species is named after the famous dipterologist Dr. Kazuhiro Masunaga from Japan.

Material examined

Holotype

JAPAN: 1 Ƌ, Ibaraki Prefecture, Tsukuba, Yawara , 16 Jun. 1997, leg. V. Fursov ( ZIN, Russia).

Paratypes

JAPAN: 1 Ƌ, labeled, Saitama Prefecture, Misato City, Edogawa river bank, 13 Oct. 2008, leg. T. Tago; 4 ƋƋ, same data, 28 Apr. 2012, leg. T. Tago; 1 Ƌ, same data, 15 May 2010, leg. T. Tago ( OMNH, 2 paratypes VSU).

Description

Male

MEASUREMENTS. Body length: 1.3–1.4 mm, wing length: 1.4–1.5 mm.

HEAD. Frons green with purple tinge, without pollen. Face narrow, its width narrower than the width between ocellar bristles in lower part. Frons green at the top, with pollinosity at the bottom. Antenna black, postpedicel small, triangular, length 1.3 times greater than height. Arista subapical, with short hairs. Length of arista more than two times longer than length of postpedicel. Proboscis and palpus brown with black hairs without pollen. Lower postocular setae pale.

THORAX. Metallic green, scutum with bronze tinge and without pollen. Pleura with pollen, propleuron with 1–2 setae. 5 pairs of strong dorsocentral setae. Acrostichal setae long, irregular 6–7 pairs, arranged in two rows. Scutellum with 2 long and 2 short lateral setae.

LEG. Fore coxa yellowish brown, mid and hind coxa dark; femora mostly yellow, except dorsal surfaces of fore femur, middle part of the mid femur and apical third part of the hind femur dark; fore and mid tibiae yellow, hind tibia dark; tarsi yellow except hind tarsus and apical parts of fore and mid tarsus dark. All coxae with dark hairs and setae. Fore femur with long white anteroventral hairs, length approximately equal to the width of femur. Fore tibia with 1 anterodorsal seta and short posteroventral hairs. Ratio of fore tibia and tarsus (from 1 to 5) 2.6: 1.5: 0.6: 0.5: 0.3: 0.4. Mid femur with a short preapical seta. Mid tibia with 2 anterodorsal and 2 short posterodorsal setae. Ratio of mid tibia and tarsus (from 1 to 5) 3.4: 1.6: 0.8: 0.6: 0.4: 0.3. Hind femur with several long preapical setae and short anteroventral hairs on entire length femur. Hind tibia with 3–4 short anterodorsal setae and short erect anteroventral hairs, its length approximately equal to the diameter of tibia. First segment of hind tarsus with short erect hairs. Ratio of hind tibia and tarsus (from 1 to 5) 3.7: 1.2: 1.0: 0.6: 0.4: 0.3.

WING. Hyaline with dark veins; R 4+5 and M 1+2 parallel at apex. Length of costal section between R 4+5 and M 1+2 more than 2 times longer than that between R 2+3 and R 4+5; m-cu distinctly shorter than apical part of CuA 1. Halter and cilia on lower calypter yellow.

ABDOMEN. Metallic green, grey pollinose laterally, covered with black hairs. Epandrium oval in the basal part of the oval; apical part of surstylus bent. Apex of phallus with two short lateral processes, left process is rounded. Cercus with brown hairs, top of the left side with long processes.

Female

Unknown.

Addition to the key

In the key to the Palearctic species of Chrysotus ( Negrobov et al. 2000) , the new species Chrysotus masunagai sp. nov. runs to Chrysotus verralli Parent, 1923 and can be distinguished from the latter by following characters:

45. Femora almost yellow; dorsal side of fore femur, middle part of the mid femur and apical part of the hind femur dark. Hind trochanter yellow …………………………………………………… ……………………………………………… Ch. masunagai Negrobov, Kumazawa, Tago sp. nov.

– Femora dark. Hind trochanter black. England …………………………… Ch. verralli Parent, 1923

Figures

Fig. 1. Chrysotus masunagai Negrobov, Kumazawa & Tago sp. nov., Ƌ, paratype, coll. 28 Apr. 2012. A. Hypopygium, lateral view. B. Apex of surstylus, lateral view. C. Antenna. D. Apex of phallus, lateral view. E. Cerci, lateral view.

Fig. 5. Male habitus, lateral view. A. Chrysotus masunagai Negrobov, Kumazawa & Tago sp. nov., Ƌ, paratype, coll. 15 May 2010. B. Chrysotus saigusai Negrobov, Kumazawa & Tago sp. nov., Ƌ, paratype, coll. 8 Jul. 2012.