Spongilla+argyrosperma

__**Spongilla argyrosperma**__
 * **Common Name**: none
 * **Class**: Demospongiae
 * **Size**: small, often mistaken for algae when in the same environment as algae, or for the surface it is attached since the normal color is grey
 * **Habitat**: live in freshwater, still and flowing habitats
 * **Location**: Canada to Florida and northern Alaska to southern California
 * **Interesting Facts**: sessile suspension feeders, attach to submerged surfaces such as rocks and logs in most inland habitats, symbiosis with many forms of algae
 * **Male and Female**: no differences, can reproduce asexually by budding or sexually producing live larvae
 * **Human Impact**: environmental stress such as changes in water temperature can cause it to reduce its body or cysts which form a protective coating around larvae so they can grow when the environment permits, scientists believe they may be helpful as indicators of water pollution
 * **Living Requirements**: filter feed to collect specimens such as bacteria and protozoa, in water between 9 and 23 degrees Celsius with about a neutral pH
 * **Life Cycle**: live at most a few years





[] http://en.academic.ru/dic.nsf/enwiki/5106837 http://animals.jrank.org/pages/1453/Sponges-Porifera-FRESHWATER-SPONGE-Spongilla-lacustris-SPECIES-ACCOUNTS.html http://www.fugleognatur.dk/wildaboutdenmark/gallery_wad.asp?mode=ShowLarge&ID=55331
 * Zookeeper: Tori Lopez**
 * References**: