Project Description

This sharp lipped boot sponge (Rhabdocalyptus dawsoni) was discovered on a dive close to my home in Victoria.  These sponges can grow very large with some specimens reaching 5 feet (1.5 m) in length.  This sponge was found at about 100 feet (30.4 m) of depth, but others have been discovered as deep as 1650 feet (502.9 m).  The outside of the sponge is always covered in silt from the water filtration that takes place.  The sharp lipped boot sponge has a range from Alaska to southern California.