Luminiflorus aquaticus, named for its light-emitting, flowering nature and marine habitat, is a rare bioluminescent flora species endemic to cold marine caves. This Ethereal Petalachordata member has composite inflorescences with undulating, translucent petals (5–30 cm) ranging from deep indigo to bright azure. Petals feature layered, semi-transparent veins emitting blue bioluminescence (450-495 nm), likely from luciferin-luciferase in glandular trichomes along margins. Central reproductive structures glow orange, attracting nocturnal pollinators in dim cave environments. Flexible stems undulate to absorb nutrients in 0–10°C waters, aiding gamete dispersal. Taxonomically, it belongs to a unique marine family with 10 related bioluminescent species, supporting cave fauna by providing essential light cues for bioluminescent aquatic pollinators within protected ecosystems.