Coenosia wrangelensis, Sorokina, Vera S., 2012

Sorokina, Vera S., 2012, Two new species and new records of Muscidae (Diptera) from Wrangel Island, Russia, Zootaxa 3478, pp. 483-492 : 487-489

Coenosia wrangelensis sp. nov.

Figs 3 A–C

Type material: Holotype male, RUSSIA, Wrangel Island, middle part of the River Mamontovaya, 71º10’N 179º46’W, 8,20. vii.2006, О. Khruleva ( SZNM). Paratype male, same data as holotype ( SZNM).

Etymology: The species name is based on the type-locality, Wrangel Island.

Diagnosis: The species is very closely similar to the Holarctic Coenosia octopunctata (Zetterstedt, 1838) and to the Nearctic Coenosia alaskensis Huckett, 1965 . These two species differ only by the wide parafacial and strongly developed seta at the middle of hind tibia in C. alaskensis . The new species can be recognized as follows: very small species (3.0– 3.2 mm), hind tibia without any pd, one pair of strong presutural dc, mid and hind femora yellow on basal 1/3, all tibiae darkened, mid and hind tibiae seem brownish, scutum with 3 distinct brown narrow longitudinal vittae along dc and ac rows and brown dusted between dc setae, reaching the apex of scutellum, sternite 5 small, without long setae at the apex.

The new species can be incorporated into the key of Sorokina (2009a: 4) to Siberian Coenosia by the following couplets:

8 All femora black, at most with apices narrowly yellow........................................................ 9 - At least mid and hind femora yellow on basal 1/3........................................................... 12 9–11 Couplets as in Sorokina (2009)

12 At least apical half or third of hind femur black............................................................ 12a - All femora completely yellow; only one pair of presutural dorsocentrals......................................... 13 12a Two pairs of presutural dorsocentral setae, the anterior pair 1/2 or 1/3 as long as posterior pair; scutum with 2 distinct brown

narrow longitudinal vittae along dorsocentral setae, without brown dust; mid and hind femora yellow on basal 2/3, all tibiae

yellow........................................................................ C. octopunctata (Zetterstedt) - One pair of presutural dorsocentral setae; scutum with 3 distinct brown narrow longitudinal vittae along dc and ac setae, with

brown dust between dc; mid and hind femora yellow on basal 1/3, all tibiae darkened............. C. wrangelensis sp. nov. 13 Couplet as in Sorokina (2009)

Description: Male: body 3.0– 3.2 mm, wing 3.2–3.5 mm.

Head: Ground-colour black with dense whitish-grey pruinosity. In lateral view, facial edge insignificantly projecting beyond level of profrons. Frontal vitta black, with dense brown dust in frontal view, 3 times as wide as a fronto-orbital plate. Frontal triangle with dense brown dust, not reaching middle of frons by far. Frons with 2-3 pairs of strong frontal setae. Width of parafacial about as wide as postpedicel and becoming a little narrower at middle. Height of gena 2 times width of postpedicel. Antenna black, postpedicel ca. 1.5 times as long as wide. Arista black, short-pubescent, with longest individual hairs shorter than basal diameter of arista. Palpus brownish. Proboscis long, shining, without apical teeth.

Thorax: Black, grey-brownish dusted. Prosternum bare. Ground-setulae of postpronotal lobe setulose, not spinulose. Scutum with 3 distinct brown narrow longitudinal vittae along dc and ac rows and brown dusted between dc setae, reaching the apex of scutellum. Presutural ac in 2 uneven rows; 1 + 3 dc. Two proepisternal setae. Apical and basal scutellars well developed and equal in length.

Legs: Fore femur black with apex narrowly yellow, mid and hind femora yellow on basal 1/3, trochanters yellow; tibiae yellow-brownish, fore tibia lighter; all tarsomeres brown. Pulvilli elongate. Fore tibia with 1 strong long p. Mid tibia with 1 ad, and 1 longer pd at middle. Hind tibia with 1 strong av in apical half, 1 strong ad at middle and without any pd; av and ad not close together, preapical ad strong but only half as long as the strong preapical d, without strong preapical pd. Mid femur with a complete row of pv, one median pv much longer than the others, 3-4 weak av in basal half, with 1 strong a and 2 strong p preapical setae. Hind femur with a complete row of short strong pv and one much longer pd at middle, with row of short av in basal half and with 2-3 long av in apical half.

Wing: Light coloured, with a slight yellow tinge and white base. Costa with weak spinules. Calypters white; lower calypter no longer than upper one. Haltere light yellow.

Abdomen: Black with thick whitish-grey dust, elongate, cylindrical. Tergites 3–5 with indistinct rounded brown sports. Sternite 1 bare, sternite 5 as in Fig. 3C .

Terminalia: as in Figs 3A, B .

Female: unknown.

Habitat: Dry sites with a hummocky mixed grass-willow-moss-grassy ( Kobresia , Carex ) cover ( Fig. 2 B).

Method of capture: By sweep net.

Distribution: Russia, Wrangel Island.

Figures

FIGURE 2. Muscidae collecting localities on Wrangel Island, Russia. A. Tundra-steppe vegetation on southern slopes. B. Dry sites with a hummocky, mixed grass-willow-moss-grassy cover. C. Mixed grass-sedge tundra-steppe on a river terrace. D. South Plain of Wrangel Island.

FIGURE 3. A – C. Coenosia wrangelensis sp. nov., male. A. Terminalia, lateral view. B. Terminalia, posterior view. C. Sternite 5, ventral view. D. Coenosia sibirica Hennig. Terminalia, lateral view.