A university specimen reveals a giant isopod species hidden for decades
Bathynomus tuebingoborikensis（bah-THIN-oh-muss too-BING-oh-bor-ih-KEN-sis）
The newly described giant isopod species from the Puerto Rican specimen.
phylogenetic analysis（fy-loh-jeh-NET-ik uh-NAL-uh-sis）
A study that compares living things to trace their family relationships.
morphological data（mor-fuh-LOJ-ih-kul DAY-tuh）
Information about an organism’s body shape and parts.
What happened
A dried giant isopod in a University of Tübingen collection has a new identity. Researchers named it Bathynomus tuebingoborikensis, a newly described giant isopod from Puerto Rico. The finding was published in Scientific Reports on October 8, 2026.
The specimen’s background
The specimen is not new. In the 1980s, paleontologist Dolf Seilacher obtained it at a Puerto Rican research station. He brought it to Tübingen for teaching. It later stayed in the university’s paleontological collection. Researchers eventually examined the dried body with modern imaging. They compared its structures with giant isopods from around the world. The specimen showed a combination of features that did not fit known species. That combination supported its description as a new species.
What giant isopods are
Bathynomus is a genus of large marine crustaceans. They resemble small land woodlice, but live in the ocean. Members occur in oceans around the world. Some reach 50 centimeters and weigh several kilograms. They can live as deep as 2,500 meters. The new specimen measured 32.2 centimeters. The team placed it among the group’s especially large forms. The species name joins Tübingen with Boríken, a Taíno name for Puerto Rico.
Why the discovery matters
The study also examined the group’s evolutionary history. The researchers compared body features from 23 living species and four fossil species. Their preliminary phylogenetic analysis suggests that Bathynomus began near today’s Gulf of Mexico. This may have happened more than 15 million years ago, during the Miocene. At that time, the Isthmus of Panama was open. Marine animals could spread westward, possibly as far as Japan. Later, Bathynomus diversified in the Indo-Pacific. A cooling period around 5.333 million years ago coincided with the evolution of very large forms. The researchers propose that some lineages later moved from Australia through Antarctica to the Americas. They also found no clear link between body size and reported living depth. Bigger bodies, therefore, cannot be explained simply by deeper water.
What is confirmed
The researchers have formally described the Puerto Rican specimen as a distinct species. They also found it closely related to another large species off Mexico’s Yucatán Peninsula. The work shows how an old collection can preserve evidence about living animals and their evolution. It does not mean every stored specimen is a hidden species. It shows that collections can answer new questions when scientists revisit them.
What remains unknown
This study mainly used morphological data, meaning body form. It does not show how many Bathynomus tuebingoborikensis live in the Caribbean. It also does not establish the species’ exact range, diet, or behavior. The proposed migration history remains an evolutionary scenario. Additional specimens and future genetic work could refine it.
What to watch next
Researchers can now look for matching specimens in Caribbean collections. They can test the relationship with the Yucatán species. More fossils and living animals may also clarify when giant bodies evolved. For now, the key lesson is simple. A deep-sea discovery does not always begin on a research vessel. Sometimes it begins with a careful second look at a university shelf.
Sources: Scientific Reports paper, University of Tübingen release.
A university shelf held a new giant isopod
📰 Full story: A university specimen reveals a giant isopod species hidden for decades
A body kept since the 1980s turned out to be a new species from Puerto Rico.
Bathynomus tuebingoborikensis（bah-THIN-oh-muss too-BING-oh-bor-ih-KEN-sis）
The new giant isopod species named from the Puerto Rican body.
giant isopod（JY-unt EYE-suh-pod）
A large ocean crustacean related to small land woodlice.
phylogenetic history（fy-loh-jeh-NET-ik HIS-tuh-ree）
The story of how living things are related over time.
💡 The gist
- A university collection held an unrecognized giant isopod.
- Scientists named it Bathynomus tuebingoborikensis, a new giant isopod species.
- Its body helps explain how giant isopods changed and spread.
What was found?
A specimen is a preserved animal used for study. This specimen came from Puerto Rico. Paleontologist Dolf Seilacher obtained it in the 1980s. He brought it to Germany for teaching. It stayed in the University of Tübingen’s paleontological collection. For decades, nobody recognized it as a new species.
Researchers used modern imaging to study its dried body. They compared it with known giant isopods. The body showed a special combination of features. Those features did not match a known species. That evidence supported a new species name.
What are giant isopods?
Giant isopods are ocean crustaceans. They look like very large land woodlice. Some reach 50 centimeters. Some weigh several kilograms. Some live 2,500 meters below the sea surface. The new specimen measured 32.2 centimeters.
Its name connects Tübingen with Boríken. Boríken is a Taíno name for Puerto Rico. This gives the species a link to both its researchers’ home and its origin.
Why does it matter?
Scientists compared 23 living species and four fossil species. They used body features to study the group’s phylogenetic history. The results suggest Bathynomus began near today’s Gulf of Mexico. That may have happened more than 15 million years ago. The Isthmus of Panama was open then. Marine animals could move westward. Later, giant isopods split into new species in the Indo-Pacific.
This history explains why an old body matters. It adds one more piece to the group’s family history. The study also found no simple link between body size and living depth. Bigger isopods are not automatically deeper isopods.
What is still unknown?
The study cannot show how many new species live in the Caribbean. It cannot show the species’ exact range or daily behavior. The migration story is still a scientific proposal. More specimens can test it.
Future researchers can check other Caribbean collections. They can compare new finds with the Yucatán species. They can also study fossils and living animals. An important discovery can begin with a careful look at something stored long ago.
A new sea woodlouse was found at a university
📰 Full story: A university specimen reveals a giant isopod species hidden for decades
A body kept at a university turned out to be a new kind of animal.
Bathynomus tuebingoborikensis（bah-THIN-oh-muss too-BING-oh-bor-ih-KEN-sis）
A new kind of giant sea woodlouse.
giant sea woodlouse（JY-unt SEE WOOD-lows）
A big ocean animal related to small land woodlice.
Puerto Rico（PWER-toh REE-koh）
The Caribbean place where the body came from.
What happened?
A university kept a dried sea animal. Its name is Bathynomus tuebingoborikensis, a new kind of giant sea woodlouse. It came from Puerto Rico. People kept it since the 1980s. Animal experts looked at its body. They compared it with other giant sea woodlice. They found a new kind. The body is 32.2 centimeters long. A ruler measured 32.2 centimeters. Some relatives grow to 50 centimeters. They live deep under the sea. This new name helps draw life’s family map. But we do not know how many live there.