Whats in maine tidal pools3/30/2023 ![]() Diploblastic: Cnidarians have two main cell layers - the ectoderm (outer layer) and the endoderm (inner layer).These animals lack a head and usually bear a crown of tentacles around the mouth. Radial symmetry: The body is symmetrical around a central axis.Some common cnidarian characteristics include: Many cnidarians are large and brightly colored. About 10,000 species are known worldwide - inhabiting oceans from the intertidal zone to the greatest depths. The cnidarians are a diverse group they include sea anemones, corals, jellyfishes, and their relatives. Many bryzoan species inhabit the intertidal, yet many species are often difficult to identify without a magnifying glass or microscope.Bryzoan colonies grow by asexual budding.Zooids use circular lophophores (feeding tentacles) to filter tiny particles from the water.Other zooids combine to form an upright, branching colony that resembles seaweed. Encrusting bryzoans often colonize the underside of rock surfaces in the intertidal zone. Zooids often connect to form a colony with a basket-weave pattern.Each zooid (individual body) is about 1 mm (0.04 in.) and covered by a calcareous exoskeleton (outer covering). ![]() This phylum is composed of bryozoans-tiny, colonial animals that live in rectangular or cylindrical shaped boxes. It often encrusts rocks in sheets up to several centimeters thick.
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