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

Ole & Saether, A., 2004, Three new species of Orthocladius subgenus Eudactylocladius (Diptera: Chironomidae) from Norway, Zootaxa 508, pp. 1-12: 9-10

publication ID

http://doi.org/ 10.5281/zenodo.157963

persistent identifier


treatment provided by


scientific name

Orthocladius (Eudactylocladius) musester

sp. n.

Orthocladius (Eudactylocladius) musester  sp. n.

( Figs 3View FIGURES 1 – 4, 10, 17View 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. 10View FIGURES 8 – 17) very broad and short. Tentorium ( Fig. 10View FIGURES 8 – 17) 195 m long, 47 m wide. Stipes ( Fig. 10View 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, R 1 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 ta 1 and ta 2 of mid and hind leg, 26–30 m long. Sensilla chaeticae absent. Lengths (in m) and proportions of legs:

Hypopygium ( Fig. 3View FIGURES 1 – 4). Tergite IX with 20 setae, laterosternite IX with 10 setae. Anal point 68 m long. Phallapodeme ( Fig. 17View FIGURES 8 – 17) 83 m long; transverse sternapodeme ( Fig. 17View 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.


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.


Museum of Zoology at the University of Bergen, Invertebrate Collection