Species similar to or like Bilateria

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

Hypothetical last common ancestor of the bilaterian clade, i.e., all animals having a bilateral symmetry. Matter of debate, for no representative has been identified in the fossil record. 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

This article lists a number of significant events in science that have occurred in the second quarter of 2020. 1 January Wikipedia

Chickens (Gallus gallus domesticus) and their eggs have been used extensively as research models throughout the history of biology. Important model for normal human biology as well as pathological disease processes. 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