Everything has a place in this World. It’s called an ecosystem ~ for some it’s general ~ for others its specific. A specific ecosystem which suits certain organisms only ~ is called a ‘niche’ habitat or ‘niche’ ecosystem.
Glossodoris atromarginata may be found in marine habitats such as reefs ~ intertidal areas and the deep ocean. Generally it is found in shallow water.
This creamy coloured ‘black margined’ glossodorid nudibranch is making his way over some carpet-like foraging grounds of encrusting coral ( probably echinopora lamelosa) towards his preferred meal and also ‘known reproduction grounds’ of marine sponges ~ Amphimedon queenslandica.