Festive Sea Slug
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An illustration based on the real animal.
A little discovery to share.
As a festive sea slug grows, its blue and yellow body pattern takes shape.
THE REAL WORLD
The real Festive Sea Slug
- Scientific name
- Hypselodoris festiva
- Japanese name
- アオウミウシ
- Group
- Ocean animals
- Class
- Gastropoda
- Order
- Nudibranchia
- Family
- Chromodorididae
- Genus
- Hypselodoris
A sea slug often seen in shallow rocky areas of the sea in every season. It lives around Honshu, Kyushu, Korea and other places.
Its body is blue with a yellow edge, and a yellow line runs down the middle of its back. The pattern varies a lot between individuals.
It eats animals called sponges. When it is young it has a shell, which it casts off partway through growing up.
How the Festive Sea Slug lives
The larvae hatch from eggs and live drifting in the water. As they develop, they change from drifting in the water to living on the seabed. Tentacles and gills form on the young animal as it grows.
筑波大学Basic data
Where the Festive Sea Slug has been recorded
Records: GBIF.org (CC0 and CC BY 4.0 records, retrieved 2026-11-07). Map: Natural EarthSee the records on GBIF
Watch wild animals from a distance. Do not touch or feed them, and take care of the places where they live.
Names around the world
Names come from Wikidata and iNaturalist records. Where a language has no recorded name, we use the scientific name.
Sources and how we check
- 鳥羽水族館 — アオウミウシChecked: 2026-11-03
- 福井県海浜自然センター — アオウミウシChecked: 2026-11-03
- 筑波大学 — アオウミウシを卵から成体まで育てることに世界で初めて成功Checked: 2026-11-03
We check each fact against its source. The illustrations simplify how the real animal looks.
The classification (class, order, family, genus) follows Wikidata records, checked against GBIF. Classifications can change as research goes on.
The basic data are the values given in each source. They vary with how the animal is measured, whether it is male or female, and whether it lives in the wild or in captivity.
This page was translated from the original Japanese with the help of AI.
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