Silkmoth from Costa Rica: Arsenura archianassa

Subject:  Silk moth?
Geographic location of the bug:  Costa Rica, Montezuma
Date: 05/25/2018
Time: 10:37 AM EDT
Your letter to the bugman:  Hi there! I would like to know the species of this Huge moth i saw in a Hotel in Costa Rica. It was as big as mt Hand.
How you want your letter signed:  Mathilde

Giant Silkmoth: Arsenura archianassa

Dear Mathilde,
We are quite certain your Giant Silkmoth is in the genus
Arsenura, and we believe it is Arsenura archianassa based on images we located on the World’s Largest Saturniidae site, though it might be a different species.  There is a mounted specimen pictured on Bold Systems.  We will contact Bill Oehlke to see if he can confirm the species.

Photo of author


BugMan aka Daniel Marlos has been identifying bugs since 1999. is his passion project and it has helped millions of readers identify the bug that has been bugging them for over two decades. You can reach out to him through our Contact Page.

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