Aiteng mysticus is an undescribed species (as of September 2011, the original description article is in press) of sea slug

Sea slug

Sea slug is a common name used for several different groups of saltwater snails that either lack a shell or have only an internal shell, in other words this name is used for various lineages of marine gastropod mollusks that are either not conchiferous or appear not to be.The phrase "sea slug" is...

, a marine

Marine (ocean)

Marine is an umbrella term. As an adjective it is usually applicable to things relating to the sea or ocean, such as marine biology, marine ecology and marine geology...

 gastropod mollusk in the family Aitengidae.

Morphologically it clearly belongs to the Aitengidae, but it shows differences to Aiteng ater

Aiteng ater

Aiteng ater is a species of sea slug, a marine gastropod mollusk in the family Aitengidae.The specific name ater is from Latin language and means black, in reference to the appearance of the slug on the mud....

at genus or species level. Its affinity to Aiteng ater is confirmed by comparison of the mitochondrial 16S rRNA-sequences.

Distribution

The distribution of Aiteng mysticus includes Hisamatsu, Miyako Island, Okinawa, Japan.