This unique creature emits light, a rare adaptation in dark environments, suggesting it may use bioluminescence for communication or predation.

Bathydevius caudactylus is hermaphroditic, possessing both male and female reproductive organs, and spawns by attaching to the seafloor to release eggs.

However, deep-sea mining poses a significant threat to Bathydevius and its habitat by disrupting the delicate deep-water ecosystem.

Similar creatures have been observed in the Mariana Trench, indicating a potentially wider distribution for Bathydevius.

The identification of this species required 150 sightings over two decades, highlighting the challenges of studying deep-sea organisms.

Researchers at the Monterey Bay Aquarium Research Institute (MBARI) have identified a new species of sea slug, Bathydevius caudactylus, nicknamed the 'mystery mollusc', which thrives in the deep sea and exhibits bioluminescence.

This mollusk, measuring 5.6 inches in length, has taken over 25 years of research to understand, led by senior scientist Bruce Robison.

Robison expressed surprise at its classification as a nudibranch due to its unique morphology and deep-water habitat.

The creature features a voluminous hood and paddle-like tail, making it challenging to classify until genetic analysis confirmed its nudibranch status.

Genetic studies revealed that Bathydevius caudactylus is distinct enough from other nudibranchs to warrant the creation of a new family, Bathydeviidae.

The name Bathydevius reflects the creature's elusive nature, which has puzzled researchers for years.

This research underscores the potential for discovering new marine organisms that could lead to novel medicines, given that marine invertebrates produce more beneficial compounds than terrestrial organisms.