There are around 6,400 living mammalian species. These features set them apart from reptiles (including birds), from whom they separated about 300 million years ago in the Carboniferous. Mammary glands, which produce milk for nourishing (nursing) their young in females, a neocortex (a portion of the brain), fur or hair, and three middle ear bones characterize mammals (from Latin mamma, ‘breast’). Image Source: Maria Victoria Gonzaga of Biology Online. Figure 1: Different types of vertebrates. Examples of vertebrates are seen in Figure 1 below. In addition, they have an internal skeletal system ( endoskeleton) to which muscles are joined. They are members of the Chordata phylum and have a backbone ( vertebrae) (where the spinal cord is located). Vertebrates are all creatures that belong to the Vertebrata subphylum. Kingdom Animalia or just Animalia is a huge kingdom consisting of eukaryotic, multicellular animals that are heterotrophic in nature. However, do people know that animals are not merely a group but a kingdom? What does Animalia kingdom mean? What defines kingdom Animalia? To define the kingdom Animalia, one must think of it in a biological sense. Kingdom Animalia: Phylum AschelminthesĮach person can say that they know of or can name at least one animal.
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