The Nelson's Rice Rat (Oryzomys nelsoni) is an extinct species of rice rat from damp thickets in the vicinity of springs near the summit of Maria Madre Island, in the Tres Marias Group, off the coast of western Mexico. Four specimens were collected on 18th May 1897. The rice rat may have disappeared due to introduced rats and cats. Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms. ... Phyla Porifera (sponges) Ctenophora (comb jellies) Cnidaria Placozoa Subregnum Bilateria  Acoelomorpha  Orthonectida  Rhombozoa  Myxozoa  Superphylum Deuterostomia     Chordata (vertebrates, etc. ... Typical Classes Subphylum Urochordata - Tunicates Ascideiacea Thaliacea Larvacea Subphylum Cephalochordata - Lancelets Subphylum Myxini - Hagfishes Subphylum Vertebrata - Vertebrates Petromyzontida - Lampreys Placodermi (extinct) Chondrichthyes - Cartilaginous fishes Acanthodii (extinct) Actinopterygii - Ray-finned fishes Actinistia - Coelacanths Dipnoi - Lungfishes Amphibia - Amphibians Reptilia - Reptiles Aves - Birds Mammalia - Mammals Chordates (phylum Chordata) include the vertebrates, together with... Orders Subclass Monotremata Monotremata Subclass Marsupialia Didelphimorphia Paucituberculata Microbiotheria Dasyuromorphia Peramelemorphia Notoryctemorphia Diprotodontia Subclass Placentalia Xenarthra Dermoptera Desmostylia Scandentia Primates Rodentia Lagomorpha Insectivora Chiroptera Pholidota Carnivora Perissodactyla Artiodactyla Cetacea Afrosoricida Macroscelidea Tubulidentata Hyracoidea Proboscidea Sirenia The mammals are the class of vertebrate animals characterized by the presence of mammary glands... Families Many, see text The order Rodentia is the most numerous of all the branches on the mammal family tree. ... Subfamilies see text Cricetidae is a family of rodents in the large and complex superfamily Muroidea. ... Tribes See text The Sigmodontinae is one of the most diverse groups of mammals. ... In biology, binomial nomenclature is a standard convention used for naming species. ... Clinton Hart Merriam (December 5, 1855-March 19, 1942) was an American zoologist and ornithologist. ... 1898 was a common year starting on Saturday (see link for calendar). ... A spring is a point where groundwater flows out of the ground, and is thus where the aquifer surface meets the ground surface. ... 1897 was a common year starting on Friday (see link for calendar). ...

The binomial of this species commemorates the American naturalist Edward William Nelson.

External source

• Flannery, Tim & Schouten, Peter (2001). A Gap in Nature: Discovering the World's Extinct Animals. Atlantic Monthly Press, New York. ISBN 0871137976.