fibulafrias

Fibulafrias is a genus of small, semiaquatic mammals belonging to the family Vordelidae, within the order Scandiptera. First described in 1898 by Danish naturalist Edgar V. Hensel, the genus is known for its distinctive bifurcated tail and elongated hind limbs adapted for swimming. Two species are currently recognized: Fibulafrias aquaticus, found in the wetlands of the North American Great Lakes, and Fibulafrias sylvanus, which inhabits the peat bogs of Eastern Europe.

Morphologically, Fibulafrias species possess a dense fur coat ranging from olive brown to slate gray, a streamlined body length of 30–45 cm, and a tail that splits into two tendrils at the distal end. The bifurcated tail functions as a rudder, providing maneuverability in shallow waters. Their ears are small and recessed, protecting them from debris. Dentition is adapted for an omnivorous diet, featuring incisors suitable for biting aquatic vegetation and molars capable of crushing invertebrate exoskeletons.

Behavioral studies indicate that Fibulafrias are nocturnal and exhibit semi-fossorial habits, burrowing into moist soil to thermoregulate. Their diet includes aquatic plants, crustaceans, and occasional fish. Reproduction occurs during the spring with litters averaging four altricial young. Both species are considered vulnerable due to habitat loss from wetland drainage and pollution. Conservation efforts include wetland restoration projects and protective legislation in several European countries and the United States.

References include the World Register of Marine Species, the IUCN Red List assessments for both species, and Hensel’s original 1898 description in the Journal of European Zoology.