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Description
Fireflukes are tiny, flattened marine organisms with a very simple build, lacking a circulatory or respiratory system, and with the excretory and reproductive organs closely tied to their diverticled gut cavity. The gut diverticle house a species of bioluminescent microorganism, which is the firefluke's main line of defense. If stressed, the firefluke releases an enzyme into its gut cavity, which will make the microorganisms glow; as the fireflukes' predators are small and translucent themselves, the glow from a swallowed firefluke will make its predator highly conspicious and risk it becoming prey itself.
Fireflukes feed mainly on microbial mats, which they graze off surfaces with their two hard jaws, but also scavenge on dead organisms. Their eggs are fairly large and contain the symbiotic microorganisms as well. Since the embryo can't activate the glow, the eggs are hidden between the sand grains, where the young fireflukes also live, before they migrate onto the ground's surface.

Description
Fireflukes are tiny, flattened marine organisms with a very simple build, lacking a circulatory or respiratory system, and with the excretory and reproductive organs closely tied to their diverticled gut cavity. The gut diverticle house a species of bioluminescent microorganism, which is the firefluke's main line of defense. If stressed, the firefluke releases an enzyme into its gut cavity, which will make the microorganisms glow; as the fireflukes' predators are small and translucent themselves, the glow from a swallowed firefluke will make its predator highly conspicious and risk it becoming prey itself.
Fireflukes feed mainly on microbial mats, which they graze off surfaces with their two hard jaws, but also scavenge on dead organisms. Their eggs are fairly large and contain the symbiotic microorganisms as well. Since the embryo can't activate the glow, the eggs are hidden between the sand grains, where the young fireflukes also live, before they migrate onto the ground's surface.