Common Name:

Thirteen-lined ground squirrel

Domain: Eukarya
   Kingdom: Animalia
       Phylum: Chordata
         Subphylum: Vertebrata
             Class: Mammalia
               Subclass: Theria
                 Infraclass: Eutheria
                     Order: Rodentia
                       Suborder: Sciuromorpha
                           Family: Sciuridae
                             Subfamily: Sciurinea
                                 Genus: Spermophilus
                                     Species: tridecemlineatus 

Photo of Spermophilus tridecemlineatus for UseCreative Commons License
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The Breakdown of Each Classification




Eukarya- Multicellular, membrane bound organelles
Animalia- Motile, heterotrophic, lack cell walls, embryo passes through blastula stage
Chordata- Possess the following at one point during development: a notochord, a hollow dorsal nerve cord, pharyngeal slits, an endostyle, post-anal tail
Vertebrata- Possesses a spinal cord/backbone
Mammalia- Air breathing, females possess mammary glands, sweat glands, have hair/fur, three middle ear bones, neocortex region of the brain
Theria- Give birth without a shelled egg
Eutheria- Placental birth
Rodentia- Two continuously growing incisors in the upper and lower jaws which must be kept short by gnawing
Sciuromorpha- Unique ifraorbital canal that includes an asciuromorphous zygomasseteric system, characterized by the attachment of the lateral masseter muscle along the side of the rostrum and the fact the medial masseter muscle does not pass through the infraorbital canal
Spermophilus- "Seed-loving"
tridecemlineatus- Thirteen-lined



Phylogenetic Tree of Mammals



Phylogenetic Tree of Mammals  Fred Hsu,  Wikimedia Commons









































Spermophilus tridecemlineatus is placed under the squirrel category in this mammalian phylogenetic tree based on morphalogical similar characteristsics.  The closest related mammal to the squirrel is the guinea pig and the second closest mammal is the beaver.  The duck-billed platypus is the furthers relative based on this phylogenetic tree.










Phylogenetic Tree of Squirrel Species Cynomys, Spermophilus, Marmota, Ammospermophilus


Phylogenetic tree of squirrel species



























































































































































Illustrated in this phylogenetic tree is genetic relationships between the four squirrel species Cynomys, Spermophilus, Marmota, Ammosperm.   The cytochrome-b gene from each genus was analyzed and compared.  Spermophilus tridecemlienatus's closest squirrel relative, as pictured, is Spermophilus mexicanus as illustrated in this phylogenetic tree that analyzed cytochrome-b gene.












Next: Habitat