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The mouth is the body orifice through which many animals ingest food and vocalize. The body cavity immediately behind the mouth opening, known as the oral cavity (or cavum oris in Latin ), [ 2 ] is also the first part of the alimentary canal , which leads to the pharynx and the gullet .
According to Frenzel's description, S. salve is more organized than Protozoa, but still very primitive for a multicellular organism.They are characterised by their distinct anterior/posterior parts and being densely ciliated, especially around the "mouth" and "anus".
Protostomia (/ ˌ p r oʊ t ə ˈ s t oʊ m i. ə /) is the clade of animals once thought to be characterized by the formation of the organism's mouth before its anus during embryonic development. This nature has since been discovered to be extremely variable among Protostomia's members, although the reverse is typically true of its sister ...
Animals are multicellular, ... The digestive chamber has two openings, a mouth and an anus, and in the Nephrozoa there is an internal body cavity, ...
' second mouth ') are bilaterian animals of the superphylum Deuterostomia (/ ˌ dj uː t ər ə ˈ s t oʊ m i. ə /), [3] [4] typically characterized by their anus forming before the mouth during embryonic development. Deuterostomia is further divided into four phyla: Chordata, Echinodermata, Hemichordata, and the extinct Vetulicolia known ...
The underside of the gumboot chiton, Cryptochiton stelleri, showing the foot in the center, surrounded by the gills and mantle: The mouth is visible to the left in this image. The mouth is located on the underside of the animal, and contains a tongue-like structure called a radula, which has numerous rows of 17
The earliest insects had chewing mouthparts. Specialisation includes mouthparts modified for siphoning, piercing, sucking and sponging. These modifications have evolved a number of times. For example, mosquitoes and aphids both pierce and suck; however, female mosquitoes feed on animal blood whereas aphids feed on plant fluids. This section ...
The Cestida ("belt animals") are ribbon-shaped planktonic animals, with the mouth and aboral organ aligned in the middle of opposite edges of the ribbon. There is a pair of comb-rows along each aboral edge, and tentilla emerging from a groove all along the oral edge, which stream back across most of the wing-like body surface.