A new species of Terellia (Diptera: Tephritidae) from Turkey with a key to Turkish species of the subgenus Cerajocera

Terellia askaleensis n. sp. which was collected from Kop Mountain, Askale, Erzurum, Turkey on Centaurea carduiformis in the summer season of 2008 and 2009, was described, illustrated and placed in the subgenus Cerajocera. The species is mostly similar to Terellia (Cerajocera) yukseli Kutuk, Terellia (Cerajocera) setifera Hendel and T. (C.) clarissima Korneyev having entirely hyaline wing. It can be distinguished from the other Turkish species of Terellia by the reduction of wing spot pattern, the presence of a spinose antennal horn, and characters of glans and aculeus. Original photographes of the specimens and detailed illustrations of the genitalia structures are provided and the key of subgenus Cerajocera is given.