Dichotomous Key/Mammalia

Dichotomous Key: Mammalia Kingdom: Animalia Phylum: Chordata Subphylum: Vertebrata Class: Mammalia Information related to Mammalia Wikipedia Wikispecies Wikicommons

Parent key: Vertebrata Subphyla Actinistia - Actinopterygii - Amphibia - Aves - Chondrichthyes - Dipnoi - Mammalia - Petromyzontidae - Reptilia Key: Mammalia Subclasses Clerck, 1757

1

Egg:	A zygote, resulting from fertilization of the ovum

Birth:

The process by which a fetus is expelled from the body of its mother

• Birth
  • Eggs - Monotremata
  • Live birth - 2

2

Marsupium:

A pouch in which an animals' young are reared through infancy

Uterus:

An organ that accepts a fertilized ovum and nourishes it until birth

Placenta:

An organ that moves nourishment and waste between a fetus and its mother

• Development of young
  • In a marsupium - Marsupialia
  • In a uterus with a placenta - Placentalia