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Animal Photo Biography

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"Animalia" redirects here. For other uses, see Animalia (disambiguation).

"Non-human animal" redirects here. For other uses, see Non-human#Animal rights and personhood.

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Animals

Temporal range: Ediacaran – Recent

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Scientific classification

Domain: Eukaryota

(Unranked) Opisthokonta

(Unranked) Holozoa

(Unranked) Filozoa

Kingdom: Animalia

Linnaeus, 1758

Phyla

Subkingdom Parazoa

Porifera

Placozoa

Subkingdom Eumetazoa

Radiata (unranked)

Ctenophora

Cnidaria

Bilateria (unranked)

Orthonectida

Rhombozoa

Acoelomorpha

Chaetognatha

Superphylum Deuterostomia

Chordata

Hemichordata

Echinodermata

Xenoturbellida

Vetulicolia †

Protostomia (unranked)

Superphylum Ecdysozoa

Kinorhyncha

Loricifera

Priapulida

Nematoda

Nematomorpha

Lobopodia

Onychophora

Tardigrada

Arthropoda

Superphylum Platyzoa

Platyhelminthes

Gastrotricha

Rotifera

Acanthocephala

Gnathostomulida

Micrognathozoa

Cycliophora

Superphylum Lophotrochozoa

Sipuncula

Hyolitha †

Nemertea

Phoronida

Bryozoa

Entoprocta

Brachiopoda

Mollusca

Annelida

Echiura

Animals are multicellular, eukaryotic organisms of the kingdom Animalia or Metazoa. Their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later on in their life. Most animals are motile, meaning they can move spontaneously and independently. All animals must ingest other organisms or their products for sustenance (see Heterotroph).

Most known animal phyla appeared in the fossil record as marine species during the Cambrian explosion, about 542 million years ago. Animals are divided into various sub-groups, including birds, mammals,With a few exceptions, most notably the sponges (Phylum Porifera) and Placozoa, animals have bodies differentiated into separate tissues. These include muscles, which are able to contract and control locomotion, and nerve tissues, which send and process signals. Typically, there is also an internal digestive chamber, with one or two openings.[10] Animals with this sort of organization are called metazoans, or eumetazoans when the former is used for animals in general.

All animals have eukaryotic cells, surrounded by a characteristic extracellular matrix composed of collagen and elastic glycoproteins.This may be calcified to form structures like shells, bones, and spicules.[13] During development, it forms a relatively flexible framework[14] upon which cells can move about and be reorganized, making complex structures possible. In contrast, other multicellular organisms, like plants and fungi, have cells held in place by cell walls, and so develop by progressive growth.[10] Also, unique to animal cells are the following intercellular junctions: tight junctions, gap junctions, and desmosomes.

Animal Photo Photos Pictures Pics Images Wallpapers