Obese Sea Pen
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An illustration based on the real animal.
A little discovery to share.
The sea cactus is an animal in the same group as corals and jellyfish.
THE REAL WORLD
The real Obese Sea Pen
- Scientific name
- Cavernularia obesa
- Japanese name
- ウミサボテン
- Group
- Ocean animals
- Class
- Octocorallia
- Order
- Scleralcyonacea
- Family
- Veretillidae
- Genus
- Cavernularia
It lives on sandy and muddy seabeds in the warm waters of the Indian Ocean and western Pacific.
How the Obese Sea Pen lives
In dark places, it stretches out its body. It spreads polyps that look like tiny sea anemones to catch food such as plankton. In bright places, it shrinks its body and burrows into the sand.
市立しものせき水族館 海響館Basic data
- Range
- Warm waters of the Indo-West Pacific
Where the Obese Sea Pen 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 — ウミサボテンChecked: 2026-11-04
- 市立しものせき水族館 海響館 — ウミ＋〇〇Checked: 2026-11-07
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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