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According to the key by Peeters & Oosterbroek https://ccw.natur..._2014b.pdf, T. regelationis is characterized by an infuscated crossvein r-m, but the abdominal segments must not be banded (= yellow anteriorly, dark posteriorly). In the latter case it would be T. annulata. Unfortunately, we can neither see the abdomen nor the female cercus, the shape of which is also important for identification. So I would go with T. cf. regelationis.
Regards, Sundew