p1241206 black planarian flatworm, girardia dorotocephala, darkfield, cecp 2023

planaria triclad planarian platyhelminthes turbellaria tricladida dugesiidae dugesia flatworm girardia dorotocephala worm freshwater aquatic animal close closeup brown black fauna natural detail predator nature wild macro isolated invertebrate creeks streams spings white eyes eyespots flatworms benthic water uncommon unusual flat microscopy microscopic pond darkfield p1241206 cecp 2023 stream delta british columbia canada