Nelson's Small-eared Shrew (Cryptotis nelsoni) is a species of mammal

Mammal

Mammals are members of a class of air-breathing vertebrate animals characterised by the possession of endothermy, hair, three middle ear bones, and mammary glands functional in mothers with young...

 in the family Soricidae. It is endemic to eastern Mexico

Mexico

The United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...

.

The species was discovered by Edward William Nelson

Edward William Nelson

Edward William Nelson was an American naturalist and ethnologist. He was born in Manchester, New Hampshire. In 1871 together with his family, he became homeless due to the Chicago Fire....

 and Edward Alphonso Goldman

Edward Alphonso Goldman

Edward Alphonso Goldman was an American zoologist. He worked extensively in Mexico with Edward William Nelson and described and revised many groups of mammals....

 in 1894, who collected a number of specimens from the slopes of the San Martín volcano

Sierra de los Tuxtlas

The Sierra de Los Tuxtlas are a volcanic belt and mountain range along the southeastern Veracruz Gulf coast in southcentral Mexico....

 in Veracruz

Veracruz

Veracruz, formally Veracruz de Ignacio de la Llave officially Estado Libre y Soberano de Veracruz de Ignacio de la Llave , is one of the 31 states that, along with the Federal District, comprise the 32 federative entities of Mexico. It is divided in 212 municipalities and its capital city is...

, Mexico. The species was then not recorded again, and thought by many to be extinct, until being re-discovered in the same area in 2004 (as described in 2009). Its biology is essentially unknown.