[3] Although the global population of J. flavoanulatus is unassigned, researchers are drawing observations that suggest these species are becoming scarce due to the decline in biodiversity.

The genus of Janolus resides in fluctuating temperatures within shallow, subtidal water levels and can even be identified far beneath the ocean surface.

Those that inhabit areas closer to the surface are considered to be in an ideal photic zone that yields a stable and illuminated environment for marine mammals.

[5] Due to their stationary nature and physical anatomy, these species are frequently exposed making them a popular prey for neighboring marine animals.

In response to predators, the genus Janolus exhibit an adaptive mechanism in which they roll into a ball, exposing its cerata.

Additionally, the ability to secrete acids from their cerata act as a crucial advantage against predators and has become part of the species' defense system.

The eggs that are dispersed by this species form into free-swimming larvae that sink to the ocean surface, eventually maturing as adults.

The larvae drift with water currents and feed on plankton before morphing into adults, eventually leaving behind their shells upon metamorphosis.