Bilateria

(redirected from Bilaterian)

Bilateria

[‚bī·lə′tir·ē·ə]
(zoology)
A major division of the animal kingdom embracing all forms with bilateral symmetry.
References in periodicals archive ?
Along with other U of A researchers, the team determined that the tracks were made by a primitive animal called a bilaterian, which is distinguished from other non-animal, simple life forms by its symmetry-its topside is distinguishable from its bottom side-and a unique set of 'footprints'.
Mox homeobox expression in muscle lineage of the gastropod Haliotis asinina: evidence for a conserved role in bilaterian myogenesis.
From the basic bilaterian plan, two developmental groups of organisms evolved namely deuterostomes (echinoderms and chordates) and the protostones (almost everything else).
About 70% of eye genes are commonly expressed in vertebrates and octopus, and 97% of these are estimated to have occurred in the ancestral bilaterian.
Early Cambrian trace fossils reflect the diversification of bilaterian animals, exhibiting a degree of morphological diversity, complexity and depth of infaunal habitation exceeding that of terminal Proterozoic (Vendian) trace fossils (e.
As a member of the Lophotrochozoa, the least investigated bilaterian superphylum (Adoutte et al.
They tentatively identify these specimens as bilaterian animals--creatures more complex than sponges or jellyfish.
In bilaterians, the Wnt/beta-catenin pathway plays a critical role during animal development, as it controls cell differentiation, proliferation and apoptosis by regulating the expression of a high number of target genes.
But previous evidence of bilaterians this early in the fossil record has been controversial, and Xiao says he still needs some convincing.
The study determined that Earth may have given rise to two distinct groups of animals: bilaterians - animals with bilateral symmetry, like humans - and non-bilaterians, which include corals, jelly fish, hydra, unusual, often poisonous, creatures known as cubozoans, and other organisms.