Taxonomy

Sagan's Taxonomy includes a number of domains and kingdoms, many more than so than on Earth. Every descendant of Protosagania is given its own kingdom, and kingdoms are grouped into domains primarily by similarities in characteristics, though there are exceptions.

Solistrogosi
"Sunlight-eaters" This group contains most of the photosynthesizers on Sagan. They are characterized by thick cell walls and many are primarily autotrophic and sedentary.

- Mancerxians

- Cryosaganians

- Hexapodians

- Hydroians

- Sammeans

Polynuclei
"Many Nuclei" Polynucleids are highly unique organisms with more than one nucleus. They are closely related to the Solistrogosi.

- Binucleida

Agilimoti
"Quick Movers" This group contains 3 kingdoms of consumer-orientated heterotrophic organisms.

- Goliathpseudopodians

- Krakocians

- Carpotestans

Neosolistrogosi
"New Sunlight-eaters" This group contains the Photosagnians, unique rapidly multiplying microbes with a variety of lifestyles.

- Photosagnians

Metalavori
"Metal Eaters" This group contains the Skarlixians and Lituswushians, unique lithophagic microbes.

- Skarlixians

- Lituswushians

Sideropneuma
"Iron Breathers" Containing only the Ferrumcarcarians, this domain is closely related to Metalavori.

- Ferrumcarcerians

Anorganellidae
"No organelles" Microbes that must "steal" organelles from other cells to survive.

- Viramoeboids