The extinct species Quemisia gravis reached a weight of approximately 10 kilograms. The discovery of new fossils in a flooded cave in San Pedro de Macorís contributed to expanding knowledge about the prehistoric fauna of the Caribbean.
SANTO DOMINGO – Long before the fauna of the Dominican Republic acquired the characteristics we know today, the island of Hispaniola was home to mammals that disappeared over time. Among them was Quemisia gravis, an extinct rodent species that reached a weight of approximately 10 kilograms, an extraordinary size compared to most rodents today.
This animal is part of the paleontological history of the Caribbean and exemplifies the diversity of species that inhabited the island in the past. Furthermore, the fossil remains found in Dominican territory have expanded our knowledge of its anatomy and the fauna that existed before the extinction of numerous species.
A discovery that took decades to expand
The first known record of Quemisia gravis dates back to March 1925, when researcher Gerrit Miller found jawbone remains in Haiti. However, for several decades, scientific knowledge about this species remained limited due to the scarcity of available fossil material.
Subsequently, on November 30, 2019, an expedition fromthe National Museum of Natural History of the Dominican Republic recovered a complete jawbone and a vertebra in a submerged cave in the province of San Pedro de Macorís.
This discovery represented an important contribution to the study of the animal, as it allowed for the expansion of the collection of known remains of a species whose bones are rare in the fossil record.
In this way, the recovery of new pieces helped to strengthen research on the extinct mammals that inhabited Hispaniola and to better document the biological diversity of the past.
What did this giant rodent look like?
According to available estimates, Quemisia gravis weighed around 10 kilograms, a characteristic that distinguished it from many contemporary rodents.
It wasn't an ordinary rat, but a member of a group of extinct Caribbean rodents. According to the National Museum of Natural History, its size places it among the largest rodents recorded on Hispaniola.
Despite advances in its study, questions remain about its complete appearance, habits, and the circumstances that led to its disappearance. Although fossils provide information about its anatomy, they do not allow us to determine with absolute certainty all aspects of its behavior or daily life.
Therefore, any visual reconstruction of the animal should be considered an illustrative scientific representation and not a real image of what the species looked like.
Submerged caves: natural archives of the past
In addition to their geological importance, flooded caves are spaces of great interest for paleontological research, because they can preserve animal remains for long periods.
In the Dominican Republic, these deposits have helped to document various extinct mammal species and to reconstruct some of the ecosystems that existed on the island before the current biodiversity was established.
In this context, the discovery of the remains of Quemisia gravis demonstrates the scientific value of exploring these natural environments. Even seemingly small pieces, such as a jawbone and a vertebra, can provide relevant information about animals that disappeared thousands of years ago.
Furthermore, the study of these materials helps to better understand the changes experienced by island ecosystems and the evolution of Caribbean fauna.
A natural history that still holds secrets
The case of Quemisia gravis highlights that the natural history of the Dominican Republic still holds many aspects yet to be investigated. Each new paleontological discovery can offer clues about the species that inhabited the territory, their physical characteristics, and the environments in which they lived.
For this reason, scientific explorations in caves and other fossil deposits continue to be fundamental to expanding knowledge about the prehistoric biodiversity of Hispaniola.
In short, the remains of this giant rodent represent a valuable window into the past and remind us that, long before the fauna we know today, the island was home to amazing animals whose history continues to be revealed through scientific research.
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