First confirmation of spongillaflies (Neuroptera: Sisyridae) from the Cretaceous

New fossil spongillaflies (Neuroptera: Sisyridae) are described from Upper Cretaceous (Santonian) Taimyr amber of northern Siberia: Prosisyrina sukachevae gen. et sp. nov. from the Yantardakh locality, and Prosisyrina sp. from the Ugolyak locality. These are the first confident sisyrid occurrences in the Mesozoic. Prosisyrina gen. nov. is most closely related to the extant tropical genus Sisyrina, and to a lesser extent the Eocene Paleosisyra. The fossil records of Sisyridae, freshwater sponges and bryozoans are reviewed, and their associations discussed. These Santonian Taimyr sisyrids reasonably imply the possible presence of Spongillina in fresh water near these localities, although freshwater sponges are yet not recorded from the Mesozoic of Eurasia.