Primitive mammal - Wildlife in the Habitats and the Fossil sites

Primitive mammal - Animals in the Habitats and the Fossil sites, and Biodiversity

Classified animal picture guide. Highlighting the link

of species shows the images, and clicking a link shows Evolutionary Tree.

The followings are extinct primitive mammals excavated and extant primitive mammals in the world. The primitive mammals evolved from mammal-like reptiles, and lived from Triassic. The explanation in brackets is the ages they lived in extinct species, and the habitat in extant species. Note that Mya is million years ago. For example, "48.6～40.4 Mya" shows a range between 48.6 and 40.4 million years ago. The time range is shown in the Geological Time Table. The followings are a part of the Evolutionary Tree.

Kingdom Animalia

Phylum Chordate

Subphylum Vertebra

Infraphylum Gnathostomata (Jawed vertebrates)

Class Synapsida (Mammal-like reptiles)

Division Mammaliaformes (Mammal-shaped reptile; 228～189.6 Mya)

Primitive mammal

Adelobasileus

(228～216.5 Mya; Earliest mammals), Sinoconodon

(203.6～199.6 Mya), Morganucodon

(203.6～189.6 Mya), Megazostrodon

(199.6～189.6 Mya; Earliest mammals), Castorocauda

(167.7～150.8 Mya; Jurassic Beaver)

Class Mammalia

Subclass Prototheria (First wild animal)

Primitive mammal

Asfaltomylos(183～167.7 Mya), Pseudotribos

(167.7～150.8 Mya), Ausktribosphenos(125～112 Mya)

Order Monotreme (Platypus, Echidna; 125 Mya～)

		Primitive monotreme	Teinolophos(125～112 Mya), Steropodon (112～99.6 Mya), Kollikodon (112～99.6 Mya)
		Platypus	Obdurodon (23.03～11.61 Mya), Platypus (Australia; Living fossil)
		Echidnas	Megalibgwilia (5.33～0.01 Mya), Hackett's Giant Echidna (1.81～0.01 Mya; １m), Western Long-beaked Echidna (Australia), Short-beaked Echidna (Australia)

Subclass Allotheria (Other animal)
Primitive mammal Haramiya (203.6～199.6 Mya), Ferugliotherium(83.5～65.5 Mya), Gondwanatherium(83.5～65.5 Mya)
- Order Multituberculata (Rodent-like mammals; 203.6～33.9 Mya)
  Primitive mammal Sinobaatar (130～125 Mya), Kamptobaatar (83.5～70.6 Mya), Catopsbaatar (83.5～65.5 Mya), Ptilodus (65～55.8 Mya), Taeniolabis(65～63.3 Mya)
- Order Triconodonta (Mesozoic mammals; 167.7～65.5 Mya)
  Primitive mammal Repenomamus (125～112 Mya), Jeholodens (125 Mya), Yanoconodon (130～112 Mya), Gobiconodon (130～112 Mya)
- Order Volaticotheria (Gliding mammals; 167.7～150.8 Mya)
  Primitive mammal Volaticotherium (167.7～150.8 Mya)
Subclass Theria (Wild animal)
- Infraclass Pantotheria
  - Order Symmetrodonta (Mesozoic mammals; 203.6～70.6 Mya)
    Primitive mammal Akidolestes (130～125 Mya), Zhangheotherium (130～112 Mya), Maotherium (125～112 Mya)
  - Order Dryolestida (Mesozoic mammals)
    Primitive mammal Laolestes (150.8～145.5 Mya), Crusafontia (130～125 Mya)
- Infraclass Metatheria (Marsupials)
  Primitive marsupial Sinodelphys (130～125 Mya)
  - Order Deltatheroida (Basal marsupials; 93.5～65.5 Mya)
    Primitive marsupial Deltatheridium (83.5～70.6 Mya)
  - Order Yalkaparidontia (Australian marsupials)
    Primitive marsupial Yalkaparidon (23～16 Mya)
- Infraclass Eutheria (Placentals; all mammals included except for the above)
  - Clade Atlantogenata
    - Group I Afrotheria (Tenrec, Hyrax, Elephant, Sea-cow)
    - Group II Xenarthra (Armadillo, Anteater, Sloth, Groud sloth)
  - Clade Boreoeutheria
    - Group III Euarchontoglires (Primate, Rabbit, Rodent)
    - Group IV Laurasiatheria (Whale, Even-toed ungulate, Odd-toed ungulate, Bat, Carnivora)