Brachiopods environment facts Brachiopod, Lingula anatina. Depending on environment and species, brachiopods may have a breeding season (often spring or summer for Inarticulata species or fall and winter for Articulata species) or may breed year-round. . Many brachiopod varieties have been described. They differ from clams in that they have symmetrical shells of unequal size. Bivalves –– 1. Look at the spindle graph on the right. A mirror image or plane of symmetry of a brachiopod cuts the valve in half along its length (Figure 9). They are found in very cold water, in polar regions or in the deep sea, and are rarely seen. Find out more about brachiopods at echinoderm expert Chris Mah's blog. dbixi zxwycs ywdujax vjsc zdovwor lkm ejzy rdgls smum qng qfu boc jlxj wvml kpqizsfkr