Species similar to or like Bilateria
Embryo, i.e. having a left and a right side that are mirror images of each other. Wikipedia
Brachiopods, phylum Brachiopoda, are a group of lophotrochozoan animals that have hard "valves" (shells) on the upper and lower surfaces, unlike the left and right arrangement in bivalve molluscs. Brachiopod valves are hinged at the rear end, while the front can be opened for feeding or closed for protection. Wikipedia
The British author J. R. R. Tolkien (1892–1973) and the names of fictional characters and places he invented for his legendarium have become the namesake of various things around the world, including street names, mountains, companies, species of animals and plants, and other notable objects. By convention, certain classes of features on Saturn's moon Titan are named after elements from Middle-earth. Wikipedia
Fossil Lagerstätte in Weng' an County, Guizhou Province, China that is notable for being one of the oldest beds to contain minutely preserved microfossils, phosphatic fossils that are so characteristic they have given their name to "Doushantuo type preservation". Of particular interest because a part of it appears to cover the boundary between the enigmatic organisms of the Ediacaran geological period and the more familiar fauna of the Cambrian explosion where lifeforms recognizable as ancestors of later and recent lifeforms first emerged. Wikipedia
- In bilaterally symmetrical organisms (Bilateria), the transcription factor FoxO impacts stress response, lifespan, and increase in stem cells.
- Bilateria, animals having a left and a right side that are mirror images of each other, appeared by 555 Ma (million years ago).
- In most bilaterian animals, Hox genes are expressed in staggered domains along the head-to-tail axis of the embryo, suggesting that their role in specifying position is a shared, ancient feature.
- Bilateral animals, including humans, are more or less symmetric with respect to the sagittal plane which divides the body into left and right halves.
- Of particular significance is Trox-2, a placozoan gene known under the name Cnox-2 in cnidarians and as Gsx in the bilaterally symmetrical Bilateria.
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