A scientific cross-section illustration of a branching staghorn coral (Acropora) polyp revealing intricate calcium carbonate skeleton architecture, tentacle nematocyst distribution, zooxanthellae symbiotic algae pockets, and oral disc mouth structure on aged cream paper, handwritten Latin annotations describing each scleractinian reef-building adaptation and symbiotic relationship, measurement scale in centimeters along the edge, soft tropical reef filtered light from upper left casting delicate shadows, museum archive quality, Pantone-accurate warm ivory skeletal branches with soft peach polyp tones and cerulean zooxanthellae highlights, composition dynamic to showcase the coral's living stone architecture, mood: marine precision capturing reef ecosystem foundation wonder, hyperrealistic details of tentacle texture and skeleton porosity patterns visible