BIO 203









                                                                                                        U. arctos 

Domain: Eukaryote
The grizzly bear has a true nucleus and membrane bound organelles.

Kingdom: Animalia
Grizzly bears are multicellular and heterotrophic.

Phylum: Chordata
The presence of a dorsal notochord/vertebral column, hollow neural tube, and post-anal tail place grizzlies in the phylum Chordata. They are also deuterostomes, triploblastic, have bilateral symmetry, and at some point during their development they had pharyngeal slits.

Class: Mammalia
The distinguishing features of a grizzly that place it in the class Mammalia are mammory glands, hair, and a four-chambered heart.

Order: Carnivora
Grizzly bears have teeth, claws, and a gut specifically designed to digest meat.

Family: Ursidae
The family name Ursidae is Latin for bear.

Genus: Ursus
The genus name Ursus is Latin for bear.

Species: U. arctos
U. arctos
refers to any subspecies of brown bear.

phylogenetic tree of bears
Phylogenetic tree showing relationship between modern bears

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