- Kingdom: Animalia
- Phylum: Porifera
- Class: Demospongiae
- Order: Poecilosclerida
- Family: Microcionidae
- Scientific name: Clathria laevis
- Norwegian: -
C. laevis, formerly known as Microciona laevis, forms thin, fragile, grey or cream colored, sheets. The surface has obvious channels spreading out from a few larger openings (osculae). The surface between the channels is covered by small pores (ostia).
The sponge seems to thrive on steep surfaces on depths below 25 meters.
C. laevis is known along the coasts of the British Isles, Iceland, Norway and Sweeden.