I would appreciate your input on the etymology of the Greek word "dyphus", as found in the genus Stegodyphus.
"Stegodyphus", as a Latinized name of this genus of araneomorph spiders in the family Eresidae, seems to be composed of two ancient Greek terms, i.e. the noun στέγος , transliterated as “stégos” meaning “roof” and the adjective διφυής, transliterated as “diphués” meaning “of double nature or form”/”double”.
I think that the French entomologist Pierre André Latreille who in 1817 coined the term "Stegodyphus lineatus" has used an adaptation of the Greek adjective “diphués” which has been Latinized as "dyphus".
As for the reason why such a spider has been named "Stegodyphus" which seems to mean “double roof” or “roof of double form or nature”, I'm sorry, but spider species and Araneae families are not my field of expertise, of course, and thus I do not know how double roof” or “roof of double form or nature” can be refer to such a spider. Maybe you are able to understand this.
I am afraid I cannot tell you more.