Concerning Aegosoma parallela, this subject has been already treated by Komiya & Drumont in 2009 in the revision of genus Megopis. The taxon Megopis parallela Lameere 1909 (nec Serville, 1832) has been described from Maurice Island (east coast of Africa). I was not able to include the paper to this topic but I sent it to Francesco who will add it in the best way on the forum.
Merci beaucoup Gandalf! The article could be free downloaded here. At the present, it is not visible on-line yet but, if you want, I can insert the title in the library.