Most members of Medusozoa, including jellyfish and most hydrozoans, have a polyp form as well, but also have a motile medusae stage. For sexual reproduction, most sponges are hermaphrodites, they produce both egg and sperm cells. In addition to sponges, Placozoa has no symmetry and was often considered a “missing link” between protists and multicellular animals. The first body fossils of animals appear in the Ediacaran, represented by forms such as Charnia and Spriggina. Species estimates shown here are based on numbers described scientifically; much larger estimates have been calculated based on various means of prediction, and these can vary wildly.
The Porifera (sponges) have long been assumed to be sister to the rest taika spinni of the animals, but there is evidence that the Ctenophora may be in that position. The animal clade had certainly originated by 650 mya, and may have come into being as much as 800 mya, based on molecular clock evidence for different phyla. Animals are the sister group to the choanoflagellates, with which they form the Choanozoa. It is thought to be one of the earliest predators, catching small prey with its nematocysts as modern cnidarians do. The apparent suddenness of the event may however be an artefact of the fossil record, rather than showing that all these animals appeared simultaneously. For instance, around 25,000–27,000 species of nematodes have been described, while published estimates of the total number of nematode species include 10,000–20,000; 500,000; 10 million; and 100 million.
Non-human animals are also an important element of human culture, having appeared in cave arts and totems since the earliest times, and are frequently featured in mythology, religion, arts, literature, heraldry, politics, and sports. In 1874, Ernst Haeckel divided the animal kingdom into the multicellular Metazoa (now synonymous with Animalia) and the Protozoa, single-celled organisms no longer considered animals. They have complex ecologies and interactions with each other and their environments, forming intricate food webs. Animals form a clade, meaning that they arose from a single common ancestor. Animals consume organic material, breathe oxygen, have muscle cells, can reproduce sexually, and grow from a hollow sphere of cells, the blastula, during embryonic development.

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Sponges lack the complex organisation found in most other animal phyla; their cells are differentiated, but in most cases not organised into distinct tissues, unlike all other animals. Despite their morphological dissimilarity with all other animals, genetic evidence suggests sponges may be more closely related to other animals than the comb jellies are. Sponges are physically very distinct from other animals, and were long thought to have diverged first, representing the oldest animal phylum and forming a sister clade to all other animals.

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The digestive chamber has two openings, a mouth and an anus, and in the Nephrozoa there is an internal body cavity, a coelom or pseudocoelom. The Bilateria are triploblastic, with three well-developed germ layers, and their tissues form distinct organs. Members of the group Anthozoa, such as sea anemones, coral, and sea pens only are sessile polyps. Instead, they rely on the flow of water through their bodies to perform these functions.

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  • For example, adult echinoderms are radially symmetric (unlike their larvae), while some parasitic worms have extremely simplified body structures.
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  • Many bilaterians have a combination of circular muscles that constrict the body, making it longer, and an opposing set of longitudinal muscles, that shorten the body; these enable soft-bodied animals with a hydrostatic skeleton to move by peristalsis.
  • It is thought to be one of the earliest predators, catching small prey with its nematocysts as modern cnidarians do.

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  • The apparent suddenness of the event may however be an artefact of the fossil record, rather than showing that all these animals appeared simultaneously.
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People have used hunting dogs to help chase down and retrieve animals, and birds of prey to catch birds and mammals, while tethered cormorants have been used to catch fish. The protostomes include the Ecdysozoa, named after their shared trait of ecdysis, growth by moulting, Among the largest ecdysozoan phyla are the arthropods and the nematodes. Most protostomes have schizocoelous development, where cells simply fill in the interior of the gastrula to form the mesoderm. The remaining animals, the great majority—comprising some 29 phyla and over a million species—form the Bilateria clade, which have a bilaterally symmetric body plan.