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AMNH 19442, collected in Cerro Chakeri, Bolivia

Sacabambaspis

Extinct armored jawless fish from the Ordovician period of Gondwana.

Photo: Bloopityboop, CC BY-SA 4.0, via Wikimedia Commons

Sacabambaspis is an extinct genus of ostracoderm that lived during the Ordovician. It inhabited shallow waters around the supercontinent Gondwana and is known from fossils found in Bolivia, Argentina, Australia, and Oman.

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  • Extinct jawless fish from the Ordovician period.
  • Found across the Gondwana supercontinent margins.
  • Head shield featured oak-leaf-shaped tubercles.
  • Models from Helsinki museum went viral online.
  • Used suction feeding with bony oral plates.

What it is

Sacabambaspis was a jawless vertebrate covered in heavy armor, belonging to the group known as ostracoderms. Its body resembled a slender tadpole with a large, shielded head and a thin tail. The head featured closely spaced eyes at the front and a narrow mouth slit. The animal lacked external fins except for its tail structure. Fossils indicate it reached about thirty-five centimetres in length. The head shield consisted of fused plates with oak-leaf-shaped bumps on the surface.

Where it lives

This species lived during the Ordovician period in the shallow seas surrounding Gondwana. Complete specimens originate primarily from the Anzaldo Formation in Bolivia. Fragments have also been discovered in Argentina, central Australia, and Oman. These finds confirm the fish inhabited the entire periphery of the ancient continent, not just southern regions. The Omani deposits date to roughly four hundred seventy million years ago.

How it lives

The fish likely used suction to feed, employing nearly sixty rows of small bony plates in its mouth. A lateral line system ran along its head and body, detecting water movements and vibrations. This sensory network helped identify nearby disturbances or predators. The brain was positioned further back in the skull due to the forward placement of the eyes. It possessed paired pineal organs, a trait unique among vertebrates.

Sacabambaspis
A drawing made by EveryFish from what this page says. It is a diagram, not a picture of the real fish.

Fish and people

Fossils were first described in 1986 based on fragments found near Sacabamba, Bolivia. Over thirty specimens from this site suggest a mass mortality event caused by storm runoff. The genus gained internet fame in 2023 due to silicone models created by Elga Mark-Kurik for the Natural History Museum of Helsinki. These models became popular subjects for fan art and memes in Japan.

Status and threats

The species is extinct, having disappeared after the Ordovician period. No current conservation status applies. The fossil record provides significant insight into early vertebrate evolution and armor development. Studies continue to clarify anatomical details, such as the structure of the tail fin.

GIT 818-1, Sacabambaspis
GIT 818-1, Sacabambaspis. Photo: Baranov, Gennadi, CC BY 4.0, via Wikimedia Commons
Fossil of Sacabambaspis, an extinct fish- Took the photo at Musee d'Histoire Naturelle, Paris
Fossil of Sacabambaspis, an extinct fish- Took the photo at Musee d'Histoire Naturelle, Paris. Photo: Ghedoghedo, CC BY-SA 3.0, via Wikimedia Commons
Model of Sacabambaspis janvieri by Elga-Mark Kurik, housed in Department of Geology, TalTech.
Model of Sacabambaspis janvieri by Elga-Mark Kurik, housed in Department of Geology, TalTech.. Photo: Gennadi Baranov, model made by Elga-Mark Kurik [2], CC BY 4.0, via Wikimedia Commons
Life restoration of the arandaspid agnathan Sacabambaspis janvieri .
Life restoration of the arandaspid agnathan Sacabambaspis janvieri .. Photo: Petr Menshikov ( https://twitter.com/Petr75113553 ; https://vk.com/pre, CC BY-SA 4.0, via Wikimedia Commons

Questions people ask about Sacabambaspis

What did Sacabambaspis look like?

It had a large armored head, a flat body, and a thin scaly tail. The eyes were close together at the front, resembling car headlights. It lacked fins except for its tail structure and measured about thirty-five centimetres long.

Where were Sacabambaspis fossils found?

Complete specimens are from Bolivia. Fragments exist in Argentina, Australia, and Oman. These locations mark the former edges of the supercontinent Gondwana during the Ordovician period.

How did Sacabambaspis eat?

It was jawless but had nearly sixty rows of small bony plates in its mouth. These plates likely moved to create suction, allowing the fish to draw in food through expansion and contraction of its throat.

Why is Sacabambaspis famous on the internet?

Silicone models made by Elga Mark-Kurik for the Helsinki museum became viral memes in 2023. The models feature doll eyes and a unique appearance that inspired significant fan art and attention in Japan.

Good reading and sources

Where this page comes from

The facts on this page come from the Wikipedia article "Sacabambaspis", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFish rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.

It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.

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Photo credits on this page

The small pictures above come from Wikimedia Commons under free licences. Some are cropped to fit.

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