Species #33,265 of 42,840
Histiochaetodon ferruginea
Histiochaetodon ferruginea flabelliparva is a species of alien fish in Fish of Ganymede: a butterfly with a sail dorsal fin, Rust Vent colouring, a fan tail and a small mouth. It lives in twilight drift, 300 m to 2 km under Ganymede’s ice. It was first found by kok on 3 November 2026.
At a glance
| Body plan | Butterfly |
|---|---|
| Dorsal fin | Sail |
| Colouring | Rust Vent |
| Tail | Fan |
| Mouth | Small |
| Home depth | Twilight drift (300 m–2 km), diving level 4 |
| Diet | Herbivore |
| First fish’s rarity | Common |
| First found | 3 November 2026 by kok |
| Players who have found it | 1 |
| Swimming today | 1 fish |
What the name means
Histiochaetodon ferruginea means roughly “rust-coloured sail-bristle-tooth”: from histio- (sail) and chaetodon (bristle-tooth), and ferruginea (rust-coloured). Every species name is built from its genes: the dorsal fin and body plan give the genus, the colouring gives the species name, and the tail and mouth the last word.
How to find one
Dive to twilight drift (it opens at diving level 4) and look for a butterfly with Rust Vent colouring, or breed for it: you need all five of its traits to show at once, and some of them may be recessive, hidden in a parent’s second gene copy. The breeding screen shows the exact odds. See how fish genetics work.