Olga Kamenskaya / Amphipod (Brandtia) on freshwater sponge (Baikalospongia) and algae, Lake Baikal, Siberia, Russia.

Olga Kamenskaya / Branching sponge (Libomirskia baicalensis), cortical sponge (Baikalospongia) and filamentous algae on the stones. Lake Baikal, Siberia, Russia. July.

Olga Kamenskaya / Freshwater amphipod (Acanthogammarus lappaceus) on Sponge (Baikalospongia) and filamentous algae , Lake Baikal, Siberia, Russia.

Olga Kamenskaya / Diver exploring Lake Baikal, looking at sponge (Baikalospongia sp), Lake Baikal, Siberia, Russia.

Olga Kamenskaya / Snails (Baicalia turriformis) and Baikal sponge (Swartschewskiia papyracea), both are endemic to Lake Baikal, Russia, May.

Olga Kamenskaya / Snails (Megalovalvata baicalensis) on overgrown sponge (Baikalospongia sp.), Lake Baikal, Russia, August.

Olga Kamenskaya / Snails (Megalovalvata sp.) on overgrown sponge (Baikalospongia sp.). Lake Baikal, Russia, August.

Olga Kamenskaya / Petrified tree trunk on lakebed amongst sponges (Lubomirskia baicalensis) and (Baikalospongia sp). Lake Baikal, Russia, December 2009.

Konrad Wothe / Sponge (Lubomirskia baicalensis) underwater, Lake Baikal, Russia

Konrad Wothe / Sponge (Lubomirskia baicalensis) growing on rocky lake bed, Lake Baikal, Russia