Andiva ivantsovi is a Vendian fossil, identified to be a bilaterian triploblastic animal in the Ediacaran phylum Proarticulata, known from the Winter Coast, White Sea, Russia.
The original reconstruction by Fedonkin proposed that the ridged surface was a convex, thin carapace made of a chitin-like, non mineralized substance, protecting the animal while "creeping or gliding" over the sea bed.
In the same reconstruction, the smooth zone was considered an imprint of the soft tissue beneath the dorsal carapace.
[1] Andiva is often found together with other species from the Ediacara biota, like Dickinsonia, Yorgia, Kimberella, Brachina, Parvancorina, Tribrachidium and others.
[4] Jerzy Dzik includes Andiva in the Dipleurozoa, with Chondroplon as the closest relative, separated from Dickinsonia and closer to Yorgia, Praecambridium, Archaeaspinus and Vendia, since all of them are sharing a dextrally bent dorsal medial chamber.