A new species of Andean mouse, Thomasomys otavalo or Otavalo’s Andean mouse, has been discovered in the mountainous regions of Ecuador. This tiny rodent, found near Mojanda, a dormant volcano with lakes in its caldera, is located about 50 miles from Quito, a city in the high Andes of northern Ecuador.
The mouse measures about 5 inches from head to body and has a tail approximately 6 inches long, making it longer than its entire body. The discovery of this species highlights the rich biodiversity of the Andean region and the adaptations of its unique wildlife.
The findings were published on November 5, in the journal Vertebrate Zoology. Researchers chose the name “Otavalo” to honour the Otavalo culture, renowned for its musical heritage and expertise in weaving and textiles. This indigenous group is a significant part of South America’s cultural identity.
Distinct Features of the Mouse
The mouse has a coat described as “fine, dense, and soft.” Its back and sides are “dark drab,” transitioning to a more brownish tone on the sides. Its stomach fur is light grey with hints of “ground cinnamon,” creating a colour gradient. The tail, a defining feature, is covered with fine hairs and has a white tip.
In comparison to related species, Otavalo’s Andean mouse is slightly larger and has shorter back hair. The exceptionally long tail further sets it apart. This species is endemic to the high-altitude montane forests of northwestern Ecuador, an ecosystem rich in orchids, ferns, and bromeliads.
Fewer than 10 locations in Ecuador have recorded the presence of this species. Its restricted habitat underscores the importance of conserving Ecuador’s montane forests. Researchers also discovered another species in the same area, Igor’s Andean mouse, which shares the characteristic of a long tail but features brown fur.
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