planaria flatworm , drawing, engraving, ink, line art,

action animal anterior art big biological biology black cilia classic contour crawling cross cut detailed digest disease drawing dugestia education engrave engraving etching eye flat flatworm giant graphic hand illustration jungle laboratory large life line microscope microscopic monochrome nervous outline pest pharynx planaria planeria pond rainforest realistic regeneration retro science scientific section sickness silhouette sketch spot system tiny turbellaria vector vintage water worm zoology