From Nookipedia, the Animal Crossing wiki

The Flatworm (ヒラムシ, Hiramushi) is a type of sea creature in the Animal Crossing series, introduced in Animal Crossing: New Leaf.

Flatworm NH.png
Scientific name
Months available June to September 15
Times available 4 pm to 9 am
Location Sea and Island
Shadow size Small
Sell price 200 Bells
Main appearances
Other appearances
Name in other languages

Japanese ヒラムシ
Simplified Chinese 海扁虫
French Ver plat
Spanish Gusano políclado
Italian Verme piatto
Russian Плоский червь

Korean 납작벌레
Traditional Chinese 海扁蟲
Quebec French Ver plat
Latin American Spanish Gusano políclado
German Meerstrudelwurm
Dutch Platworm

While initially absent from Animal Crossing: New Horizons, the Flatworm was added in the 1.3.0 Free Summer Update.

Catch details[edit]

In New Leaf[edit]


"I got a flatworm! Why's it so flat? Steamroller?"

Times August - Mid-September: 4 PM - 9 AM
Peak Times
Location Sea, Tortimer Island
Shadow Size Small
Shadow Movement Uniform
Sea Creature Size 4 cm
Selling Price   200 Bells
Tank Size  

In New Horizons[edit]


"I got a flatworm! Guess it forgot its spareworm."

Time of Year North: Aug – Sep
South: Feb – Mar
Time of Day 4 PM – 9 AM
Shadow Size X-Small
Shadow Movement Very slow
Total Catches


Selling Price   700 Bells
Tank Size  

Donating to the museum[edit]

In New Leaf[edit]

Upon donating a Flatworm to the museum, it can be found in the large pool in the first room of the sea exhibit, along with many other species of sea creatures. It is found near the entrance of the exhibit. The exhibit has this to say about the Flatworm:

"Flatworms are flat creatures, and while some types look like Sea Slugs, they have little else in common. Some types are venomous and produce a poison similar to the kind blowfish are famous for. Flatworms are hermaphrodites and mate by fighting to determine the loser, who then bears the eggs."

In New Horizons[edit]

When donating to the museum, Blathers will say the following:

Marine flatworms are...well...flat and worm-like, as their name suggests. But while this sea creature is said to be quite simple, it does possess some rather remarkable powers. You see, when flatworms are injured, they can grow new body parts with ease. And when a flatworm is cut in half, each side can grow a whole new flatworm of its own. But most impressive of all...some flatworms can clone themselves without suffering a single cut! Ah, if only I, too, could safely divide myself in two. Hoo, imagine all the work I could do!"

Real-world information[edit]

Flatworms are their own phylum, which includes tapeworms and flukes. Over half of all known flatworm species have parasitic behavior, which means that they thrive on another organism, a host, at the host's expense. Flatforms also lack a distinguished respiratory and circulatory organs, which is one reason for their flat shape. As a result, flatworms must rely on diffusion to take in oxygen while expelling carbon dioxide.

Names in other languages[edit]

Flat worm

  Gusano políclado