Taxonomy

Below is the taxonomy of listeria as well as the reasons it is categorized in each level of classification. In the brackets are characteristics of listeria that match the characteristics of each level of classification.

Domain: Bacteria (Prokaryotic and no nuclear membrane, unlike eukarya. Has peptidoglycans in cell wall, unlike archea.)

Kingdom: Eubacteria (Has cell wall but no chloroplast, mitochondria, or other organelles.)

Phylum: Firmicutes (It's cell wall is gram positive and it is able to survive harsh conditions.)

Class: Bacilli (Listeria is rod shaped and is able to release endospores)

Order: Bacillales 

Family: Listeriaceae

Genus: Listeria

Species: (depends on type of listeria)
L. monocytogenes
L. grayi
L. innocua
L. seeligeri
L. murrayi
L. ivanovii

L. welshimeri