Tag Archives: Nesoryzomys

Nesoryzomys sp. ‘1 Isla Isabela’

Isabela Rice Rat (Nesoryzomys sp.)

This is one of two species of rice rats that formerly were endemic to the Isla Isabela in the Galápagos Islands, it disappeared sometimes during the middle of the 19th to the early 20th century.


edited: 11.06.2020

Nesoryzomys darwini Osgood

Darwin’s Galapagos Mouse (Nesoryzomys darwini)  

Darwin’s Galapagos Mouse was described in 1929; it was endemic to the Isla Santa Cruz in the Galápagos archipelago.

It reached lengths of about 22 cm, including the tail; it was predominantly cinnamon rufous colored, the upper parts with a mixture of blackish hairs, the tail was dusky above and whitish below. [1]

Darwin’s Galapagos Mouse was last seen in 1930; the species disappeared shortly after, perhaps due to the introduction of Norway Rats (Rattus norvegicus (Berkenhout)), Black Rats (Rattus rattus (L.)), and feral cats.



[1] Wilfred H. Osgood: A new rodent from the Galapagos Islands. Field Museum of Natural History 17(2): 21-24. 1929


edited: 01.06.2021

Nesoryzomys indefessus (Thomas)

Santa Cruz Rice Rat (Nesoryzomys indefessus)  

The Santa Cruz Rice Rat was described in 1899, it was restricted to the Isla Santa Cruz, Galápagos Islands.

The species disappeared soon after its description due to the introduction of Black Rats (Rattus rattus (L.)) and feral cats.


The Fernandina Rice Rat (Nesorhyzomys narboroughi Heller), one of only four Galápagos Islands rice rat species surviving until today, was formerly treated as a subspecies of the Santa Cruz Rice Rat.


edited: 11.06.2020