Macro
Spanish Dancer
Hexabranchus sanguineus · Marine gastropod mollusk — family Hexabranchidae; one of the largest nudibranchs known
Most nudibranchs crawl; the Spanish dancer, disturbed, lets go of the reef and swims — mantle skirts flaring and rolling in the deep-red flamenco motion that named it. It ranks among the largest of all nudibranchs, a crimson animal that can reach forearm length, and it is almost strictly nocturnal, which makes it a signature night-dive find across the Indo-Pacific and Red Sea. By torchlight look for one plowing across open reef between sponge meals, often carrying passengers: emperor shrimp ride the mantle folds like deckhands. Its eggs are as recognizable as the animal, a rose-shaped ribbon of pink spirals fixed to hard bottom and chemically defended like the adult. Watch a voluntary swim from a respectful distance; forced performances exhaust an animal with nowhere to hide.
どこで・いつ見られるか
「常駐（Resident）」とは、そのダイビングスポットでのほとんどのダイブで遭遇できることを意味します。「季節限定（Seasonal）」とは、記載された月に確実に見られることを意味します。それ以外の出会いはボーナスであり、計画の前提にはなりません。
| 目的地 | 信頼性 | 月 | メモ |
|---|---|---|---|
| Sharm El Sheikh & Ras MohammedEgypt | Occasional | 年間を通じて | |
| North & South Malé AtollsMaldives | Occasional | 年間を通じて | |
| Marsa Alam & the Deep SouthEgypt | Occasional | 年間を通じて | |
| Lembeh StraitIndonesia | Occasional | 年間を通じて | |
| Kona, HawaiʻiUnited States | Occasional | 年間を通じて |
ベストな月、一目でわかる
理解を深める
ハビタット: Coral reefs, rubble, and lagoon slopes, sheltering by day and crossing open bottom at night between sponge meals.
分布域: Tropical Indo-Pacific and Red Sea, east to Hawaii and French Polynesia.
生態・行動: Almost strictly nocturnal; crawls like any dorid until disturbed, then swims free with rolling flexes of its flared crimson mantle. Lays a rose-shaped pink egg ribbon on hard bottom.
食性: Sponges, favoring chemically defended species whose compounds it stores for its own protection.
サイズ: 目安は 0.25 m; 確認済みの最大記録 0.6 m (body length; most individuals run 20–30 cm).
出会ったときの正しいふるまい方
If the swimming display happens, enjoy it — but never lift, prod, or fan an animal loose to force a performance, and leave the egg roses unhandled.
保全
Not formally assessed; conspicuous size makes it a frequent harassment victim, which responsible operators actively brief against.
目撃情報で知られるダイブサイト
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