Orthocladius (Orthocladius) mitisi Goetghebuer, 1938

Magoga, Giulia, Montagna, Matteo, Marziali, Laura, Rossaro, Bruno & Disaa, 2017, Revision of type and non-type material assigned to the genus Orthocladius by Goetghebuer (1940 - 1950), deposited in the Royal Belgian Institute of Natural Sciences (Diptera: Chironomidae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 57 (2), pp. 723-749 : 733

Orthocladius (Orthocladius) mitisi Goetghebuer, 1938 , stat. restit.

( Figs 30–36 )

Orthocladius mitisi Goetghebuer, 1938: 458 .

Type material examined. HOLOTYPE: ♁ mounted on slide, labelled:‘ Orthocladius mitisi 1938 // type locality: Basse Autriche // Coll et det. M. Goetghebuer Orthocladius mitisi Goetgh. R.I.Sc.N.B. 18.073’.

Comments. The holotype of Orthocladius mitisi was mounted on a slide from a specimen formerly compressed in isinglass between two layers of celluloid ( LANGTON & CRANSTON 1991). LANGTON & CRANSTON (1991) considered O. mitisi as a junior synonym of O. glabripennis ( Goetghebuer, 1921) on the basis of the genitalia and similarity between pupal exuviae labelled ‘ mitisi’ at the Zoologische Staatssammlung des Bayerischen Staates, Munich, Germany (ZSM) and the pupal exuviae of O. glabripenni s ( LANGTON 1984). Except for missing antennae the specimen is rather well preserved and recognized here as a distinct species. This conclusion is based on the following evidence. The dorsal lobe on the inferior volsella is very narrow, 13–15 μm wide on a gonocoxite 277 μm long and 40 μm wide, whereas in O. glabripennis the dorsal lobe is proportionally much wider. This large difference supports the conclusion that O. mitisi and O. glabripennis are different species. In addition, the thorax in O. mitisi has light brown vittae, while in O. glabripennis the vittae are darker. The hypopygium of the holotype of O. mitisi has some similarity with other species in Orthocladius s. str., such as O. timoni (see below), O. excavatus Brundin, 1947 and O. marchettii Rossaro & Prato, 1991 , but all are well different from O. glabripennis . See also the section on Orthocladius timoni below.

Figures

Figs 30‒36. Orthocladius (Orthocladius) mitisi Goetghebuer, 1938: 30 ‒ eyes, 31 ‒ thorax, 32 ‒ palps, 33 ‒ anal point, 34 ‒ superior volsella, 35 ‒ inferior volsella, 36 ‒ gonostylus.