The Pyrenean desman (Galemys pyrenaicus), also known as the Iberian desman or trumpet rat, is a species of small semiaquatic mammal in the family Talpidae. It is endemic to the mountain ranges of the Pyrenees and to mountainous areas of the northwestern Iberian Peninsula, primarily the Cantabrian Mountains and the Sistema Central. Its distribution includes four European countries: Andorra, Spain, France, and Portugal. The species is closely related to the Russian desman. The Pyrenean desman shows anatomical features that resemble those of several other mammals, including the brown rat (notably a robust tail adapted for swimming), the European mole (with strong, clawed forelimbs and a sensitive snout), and the common shrew (with an elongated snout used to capture small arthropods). The distinctive trunk-like snout gives rise to the alternative name "trumpet rat". The species has very limited vision and relies primarily on a highly developed sense of touch for orientation and foraging. Its mobile, prehensile snout bears vibrissae at the base and Eimer's organs at the tip, specialized tactile structures. The desman is an insectivorous semi-aquatic species that inhabits mountain lakes and fast-flowing streams with clear water. Its diet consists mainly of aquatic larvae that are sensitive to pollution, including larvae of stoneflies, caddisflies, and mayflies. The species is primarily nocturnal and avoids human presence, which makes direct observation difficult. Several aspects of its biology, including details of its reproductive cycle, remain insufficiently documented. The Pyrenean desman is restricted to unaltered and unpolluted watercourses and is therefore considered a reliable bioindicator of aquatic environmental quality. It is particularly sensitive to anthropization of its habitat: the construction of dams, the armouring of riverbanks with rock, and the building of barrages lead to habitat loss and fragmentation. Since 2021, the species has been classified as Endangered by the International Union for Conservation of Nature across its entire range, with populations continuing to decline despite conservation measures implemented since the early 21st century. Historically, the desman was often regarded as a pest by local communities, particularly by fishermen and fish farmers, largely due to limited understanding of its ecology and diet. From the 1990s onward, this perception began to change as scientific research increased. In the early 21st century, the species occupies a paradoxical position: although it remains little known to the general public and faces a high risk of extinction, it has become an emblematic animal of the Pyrenean region and appears with increasing frequency in regional cultural expressions.
Description
General anatomy
The Pyrenean desman measures approximately 25 cm (9.8 in) in total length, more than half of which is accounted for by the tail, and has a body mass of 50 to 60 g (2.1 oz). There is no pronounced sexual dimorphism; females are on average slightly larger than males. Reliable sex determination generally requires close examination of the external genitalia. The species has webbed hind feet, a relatively uncommon adaptation among insectivorous mammals, which is one of the characteristics supporting its placement in a monotypic genus. The genus Galemys includes only this single species. Comparable adaptations are otherwise found only in Limnogale, the Ruwenzori otter shrew, and the elegant water shrew. In other respects, the morphology of the Pyrenean desman combines features found in several more familiar mammals:
from the brown rat, it shares robust hindquarters, well-developed thighs, and a long, thick tail that facilitates locomotion in aquatic environments; from moles, it has powerful, clawed forelimbs adapted for digging burrows used for shelter and rearing young, as well as a snout with a highly developed tactile capacity; from the common shrew, it shows a prehensile trunk and prominent vibrissae, which are used to detect prey larvae and to orient within its surroundings. The dentition comprises 44 teeth, arranged according to the dental formula 3.1.4.3 in both the upper and lower jaws. This complete dentition corresponds to that observed in European moles. The two anterior upper incisors are particularly developed. The first premolar, considered supernumerary, is interpreted as a deciduous tooth that has become permanent.
Adaptations
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