barreleye fish aka the spookfish

areas barreleye bathylychnops bioluminescence complex deepsea detection dim diverticula dna dorsal downwelling evolution exilis eyes head imaging lateral light macropinna magnetic mesopelagic microstoma morphology natalensis neural ocular opisthoproctus optically output phylogeny reflection refraction resonance retinal rhynchohyalus rudimentary sequences soleatus spookfish stimuli sunlight telescopa transparent tubular ventrolateral vertebrate winteria