Gymnometriocnemus (Gymnometriocnemus) marionensis Saether , 1969

Stur, Elisabeth & Ekrem, Torbjorn, 2015, A review of Norwegian Gymnometriocnemus (Diptera, Chironomidae) including the description of two new species and a new name for Gymnometriocnemusvolitans (Goetghebuer) sensu Brundin, ZooKeys 508, pp. 127-142 : 130

Taxon classification Animalia Diptera Chironomidae

Gymnometriocnemus (Gymnometriocnemus) marionensis Saether, 1969

Remarks.

Only one specimen of this species from Norway has been available to us. It fits Sæther’s description of Gymnometriocnemus (Gymnometriocnemus) marionensis in having very slightly larger megasetae on the gonostyli than specimens of Gymnometriocnemus (Gymnometriocnemus) subnudus (Figs 4A, C), but this character is not trustworthy as it is dependent on the orientation of the gonostyli in the slide-mount. The larger anal point will separate Gymnometriocnemus (Gymnometriocnemus) marionensis (c. 38 µm long) from Gymnometriocnemus subnudus (c. 17 µm long). Cranston and Oliver (1988) synonymized Gymnometriocnemus (Gymnometriocnemus) marionensis with Gymnometriocnemus (Gymnometriocnemus) subnudus doubting the diagnostic value of the size of the megaseta and position of the end of R2+3 (Fig. 5A). We have not examined the types of Gymnometriocnemus (Gymnometriocnemus) marionensis , but specimens from Michigan and North Carolina (ZMBN) identified by Ole Sæther as belonging to this species. This record of the species is the first from Norway and Europe.