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Terellia ptilostemi sp. n., a previously unknown peculiar species of the genus Terellia Robineau-Desvoidy, 1830 is described based on the holotype and a large series of paratypes reared from Ptilostemon rhiphaeus (Pau & Font Quer) Greuter (Asteraceae, Cardueae) in Tétouan and Chefchaouen Provinces of Western Morocco. The new species has the phallus glans typical for species of the Terellia serratulae group, but has an extremely uncommon wing pattern of four black crossbands, whereas the other species of the group have entirely hyaline or slightly infuscated wings. [ABSTRACT FROM AUTHOR]

Genus Terellia Robineau-Desvoidy, 1830 includes approximately 60 species throughout the Palearctic region. Larvae of Terellia develop in the flowerheads of the family Asteraceae. In this study, the authors collected species of Terellia from possible host plants in the summer of 2009 and 2017 in northeastern Turkey using an insect net. Collected materials were pinned and deposited in the Gaziantep University Entomology Laboratory. Upon identification, Terellia (Cerajocera) akguli sp. nov. has been described as a new species and placed in the subgenus Cerajocera. Also, T. (C.) armeniaca Korneyev, 1985 has been recorded for the first time in Turkey with this study. The paper describes new species and presents morphological characteristic figures of the new species. Additionally, the key for the subgenus Cerajocera distributed in Turkey is provided. [ABSTRACT FROM AUTHOR]

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Allozyme frequencies of 15 enzyme loci, 14 of which were polymorphic, were used to characterize seven Terellia virens populations originating from three allopatrically distributed Centaurea species. The two populations whose origins were geographically furthest apart, from Israel (on C. iberica) and from Switzerland (on C. vallesiaca), showed relatively high values of genetic distance from the 5 populations sampled in Austria and Hungary (on C. maculosa) (Nei's D>0.07). The latter five displayed a high degree of genetic similarity. No diagnostic (fixed) allelic differences were observed between these three groups of T. virens populations, but they could be well characterized by significant differences in allelic frequencies at 9 enzyme loci. Independently of this study, the populations from Switzerland ( C. vallesiaca) and eastern Austria ( C. maculosa) were selected as potential source populations for future introductions into North America for the biological control of introduced C. maculosa and C. diffusa. Based on the observed genetic differences and results from field experiments on the host specificity of these two potential source populations, it is argued that host specificity screening tests should be conducted separately for local (host plant) populations, as such populations might accept a different set of hosts. Biotype mismatch and the risk of spill-overs to native species could thus possibly be reduced. [ABSTRACT FROM AUTHOR]