Bivalve mollusks include many species of clams, oysters, mussels, and scallops. All the bivalves have shells divided into two halves, hence their name. Water flows into the gill chamber through an incurrent siphon, passes over the gills, and then exits the mantle cavity through an excurrent siphon. Being filter-feeders, most bivalves lead rather sedentary lives. They are protected by two hard shells made of calcium carbonate which are drawn together by powerful muscles.
Mussels secrete strong threads that tether to rocks, docks, boats, and the shells of other animals.
There are over 57,000 species of scorpions, spiders, ticks, and mites in the world that belong to Class Arachnida. Arachnids have one or two main parts while insects have three. As the chelicerae and pedipalps chew the prey, the spider spills digestive juices onto the torn tissues. The food softens, and the spider sucks up the liquid meal. In the South Okanagan, hardly anything is known about the six species of sun scorpions that are known from the south Okanagan and few specimens of the Western Ridge Mussel have been found.