The recent publication of a detailed study on the autopodial morphology of the Late Pleistocene hippopotamus from Vlychada Cave in Dirós, Laconia, Greece, offers fresh insights into one of Europe's final refugia for this iconic species. Titled "Autopodial morphology of the Late Pleistocene hippopotamus (Hippopotamus amphibius) from Vlychada Cave (Dirós, Laconia, Greece)," the paper appears in the journal Geobios and is available online as of 23 June 2026.

Lead author Michail Georgitsis, along with co-authors Athanassios Athanassiou, Socrates Roussiakis, Vassileios Giannopoulos, Konstantinos Athanasiou, and Nikolaos Tsoukalas, examined 18 well-preserved carpal and tarsal bones recovered from the submerged galleries of the cave. The material, housed at the Museum of Paleontology and Geology at the National and Kapodistrian University of Athens, belongs to adult individuals and dates to the Late Pleistocene, with a minimum age of approximately 31,650 years before present based on associated stalagmite material.

Background on European Hippopotamuses

During the Pleistocene epoch, hippopotamuses thrived across much of Europe. Two primary species dominated the fossil record: the larger Hippopotamus antiquus, which appeared in the Early Pleistocene and persisted into the Middle Pleistocene, and the smaller Hippopotamus amphibius, which emerged in the late Middle Pleistocene and survived until the Late Pleistocene. The latter is considered conspecific with the modern African common hippopotamus. In Greece, remains have been documented at 31 localities spanning the Pleistocene, with significant concentrations in the Peloponnese region, including the Megalopolis Basin and sites such as Elis and Aetorráchi.

Vlychada Cave, also known as Diros or Glyfada Cave, stands out as a key locality. Located on the western coast of the Mani Peninsula in southern Laconia, the cave system extends over 14,750 metres and features flooded chambers. Fossil discoveries there, including more than a hundred hippopotamus specimens, position the site as one of the southernmost European refugia for temperate fauna during the cold phases of the Late Pleistocene.

The Research and Its Significance

The new study focuses specifically on autopodial elements—the bones of the wrist and ankle—which provide critical data on locomotion, body size, and environmental adaptation. Researchers compared the fossil specimens with modern samples from collections at institutions such as the Royal Museum of Central Africa and the Muséum national d’Histoire naturelle in Paris.

Findings indicate a close morphological affinity between the Vlychada fossils and extant Hippopotamus amphibius. Minor differences appear in the configuration of articulation facets, potentially reflecting subtle environmental variations. Metrically, the fossils align with large individuals within modern populations. These observations reinforce the view that the Greek hippos belonged to the same species as their African counterparts and survived in isolated southern refugia long after populations farther north had disappeared.

The full paper is accessible at https://www.sciencedirect.com/science/article/abs/pii/S0016699526000276. The authors credit the collaborative effort that brought together expertise in vertebrate paleontology, speleology, and comparative anatomy.

Photo by Jonathan Göhner on Unsplash

Implications for Paleontology and Climate History

The Vlychada material contributes to understanding how large mammals responded to glacial-interglacial cycles. As temperatures dropped across Europe, hippos retreated to milder southern habitats such as the Mani Peninsula. The cave's deposits also yielded remains of other species, including leopards and deer, painting a picture of a diverse Late Pleistocene ecosystem.

Similar patterns appear at other Mediterranean sites, underscoring the role of southern Europe as a biodiversity stronghold. The study highlights how detailed osteological analysis can reveal ecological nuances even in fragmentary remains.

Broader Context in Greek Research

Greece continues to yield important Pleistocene vertebrate discoveries. The Megalopolis Basin, for example, has produced rich assemblages that help calibrate biostratigraphic frameworks across the region. The Diros findings complement these efforts by documenting one of the latest occurrences of hippopotamuses on the continent.

Institutions such as the National and Kapodistrian University of Athens play a central role in preserving and studying these fossils. Ongoing speleological and paleontological work in the Mani Peninsula promises additional discoveries.

Future Directions

Researchers note that further radiometric dating and isotopic analyses could refine the chronology and dietary inferences for the Vlychada population. Comparative studies with other Late Pleistocene European sites may clarify regional variation within Hippopotamus amphibius.

The publication arrives at a time when interest in Quaternary paleontology is growing, driven by questions about species resilience in the face of rapid climate change—parallels that resonate with contemporary conservation biology.

Photo by Leif Linding on Unsplash

Conclusion

This detailed examination of autopodial remains from Vlychada Cave strengthens the case for Hippopotamus amphibius as a late-surviving species in southern Europe. By bridging fossil evidence with modern morphology, the authors provide a valuable reference for future studies of European Pleistocene faunas. The work exemplifies the collaborative, meticulous research that advances our understanding of ancient ecosystems.