Purple Intertidal Sponge

Purple Intertidal Sponge

Scientific Name: Haliclona permollis

Authors: Aidan Knudsen and Coral Reynolds


Haliclona permollis, more commonly known as The Purple Intertidal Sponge or Purple Encrusting Sponge is a purple (sometimes pink or grey) sponge with a velvety texture. This sponge is covered with small circular ostia (pores) where water enters and larger osculum where water leaves. The Purple Intertidal Sponge can grow up to 1.6 cm (0.7 in) thick. It lives in the intertidal waters between Southern California and Southern Alaska and can usually be found in waters up to 6m (20ft) deep in the intertidal areas, as well as in tidepools and on rocky shores.

This species is similar to the Breadcrumb Sponge (Halichondria panicea) and both species are frequently found on the rocky shores around Vancouver Island. Similar to other sponges th Purple Intertidal Sponge gets it’s nutrients by constantly moving water through it’s body (which enters through the ostia and leaves via the osculum) and filtering out and ingesting things like bacteria and organic matter.

Velvety Red Sponge

Common Name: Velvety Red Sponge

Author: Grace Gong

Scientific Name: Ophlitaspongia pennata


The Velvety Red Sponge is distributed along the pacific coast (from British Columbia to California). It is often found in small crevices, under large rocks, and on the undersurfaces of seaweed in intertidal zone, where they are shaded from sunlight.

The Velvety Red Sponge usually feeds on small marine organisms (for example shrimp and crab larvae), some bacteria, and small particles of dissolved organic matter by using filtering. Its predators are nudibranchs, snails , and sea stars.

There are 10 different intertidal species with the common name of Velvety Red Sponge worldwide.  Their smooth, tough surface are scattered with small hole that are up to 2mm in diameter, and all of them are characterized by their distinctive color, which can range from bright red to a dull orange-red depending on the species.