This seems an incorrect synonym, since it is clearly a different species, and also widely recognized in literature as a valid species, see for instance:
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incorrect synonomy?
On GBIF species occurrence search i found this synonomy:
Clanoptilus elegans (Olivier, 1790) = Clanoptilus marginellus (Olivier, 1790)
This seems an incorrect synonym, since it is clearly a different species, and also widely recognized in literature as a valid species, see for instance:
https://rosa.uniroma1.it/rosa02/fragmenta_entomologica/article/view/368
http://visnyk-biol.uzhnu.edu.ua/article/view/160568
https://dspace.uzhnu.edu.ua/jspui/handle/lib/3060
and others.
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