Orthocladius ( Eudactylocladius ) musester, Ole & Saether, A., 2004

Orthocladius ( Eudactylocladius) musester View in CoL sp. n.

( Figs 3 View FIGURES 1 – 4 , 10, 17 View FIGURES 8 – 17 )

Type material

Holotype ɗ, NORWAY: Hordaland, Bergen, Museum of Zoology, on the window of the preparation room, 14 vii 1987, Ø. A. Schnell ( ZMBN Type No. 396).

Diagnostic characters: The male imago differs from other species of the subgenus except most O. ( E.) fuscimanus by having two well defined lobes on the gonocoxite. It differs from O. ( E.) fuscimanus by having the inferior volsella (apical lobe) sharply delimited and with weak apical microtrichiae, a broad and short cibarial pump and no sensilla chaetica on tarsi.

Etymology: From Latin, museum, and – ester, belonging to, referring to the place of collection.

Male imago (n =1)

Total length 3.81 mm. Wing length 2.30 mm. Total length/wing length 1.66. Wing length/length of profemur 2.67. Coloration yellowish with dark brown thoracic markings. Wing pale greyish clouded with squama dark.

Head. AR 1.25. Ultimate flagellomere 605 m long. Temporal setae 13, including 5 inner verticals, 4 outer verticals, and 4 postorbitals. Clypeus with 13 setae. Cibarial pump ( Fig. 10 View FIGURES 8 – 17 ) very broad and short. Tentorium ( Fig. 10 View FIGURES 8 – 17 ) 195 m long, 47 m wide. Stipes ( Fig. 10 View FIGURES 8 – 17 ) 161 m long, 79 m wide. Palpomere lengths (in m): 38, 56, 131, 139, 203.

Thorax. Antepronotum with 3 setae. Dorsocentrals 13, acrostichals 12, prealars 4. Scutellum with 12 setae.

Wing. VR 1.09. Costal extension 53 m long. R with 10 setae, R1 with 1 seta. Squama with 18 setae.

Legs. Spur of front tibia 56 m long, spurs of middle tibia 30 and 26 m long, of hind tibia 75 and 34 m long. Width at apex of front and middle tibia each 45–47 m, of hind tibia 54 m. Pseudospurs present on ta1 and ta2 of mid and hind leg, 26–30 m long. Sensilla chaeticae absent. Lengths (in m) and proportions of legs:

Hypopygium ( Fig. 3 View FIGURES 1 – 4 ). Tergite IX with 20 setae, laterosternite IX with 10 setae. Anal point 68 m long. Phallapodeme ( Fig. 17 View FIGURES 8 – 17 ) 83 m long; transverse sternapodeme ( Fig. 17 View FIGURES 8 – 17 ) semi­circular, 109 m long, oral projections well developed. Gonocoxite 289 m long, with two distinct lobes, posterior lobe bluntly triangular with apical microtrichiae. Gonostylus 105 m long; crista dorsalis apical, truncate; megaseta 15 m long. HR 2.75, HV 3.63.

Comments

Specimens of this species previously could have been regarded as forms of O. ( E.) fuscimanus . A slightly cloudy wing with darker squama also is found in at least some specimens O. ( E.) fuscimanus (Kieffer) . In specimens O. ( E.) schnelli , described above, the wing is darker.