p1040701 stained specimen of a planaria flatworm with digestive tract in black, cecp 2023

planaria triclad planarian platyhelminthes turbellaria tricladida dugesiidae flatworm worm freshwater aquatic animal close closeup red fauna natural detail predator nature wild macro isolated invertebrate creeks streams spings white eyes eyespots flatworms benthic water uncommon unusual flat microscopy digestive internal organs p1040701 stained specimen tract black cecp 2023 preserved fed carbon highlight 3-lobed