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Bilateria (/ ˌ b aɪ l ə ˈ t ɪər i. ə / BY-lə-TEER-ee-ə) is a large clade or infrakingdom of animals called bilaterians (/ ˌ b aɪ l ə ˈ t ɪər i. ən / BY-lə-TEER-ee-ən), characterized by bilateral symmetry (i.e. having a left and a right side that are mirror images of each other) during embryonic development.
I Bilateri (Bilateria Hatschek, 1888) sono uno dei due grandi raggruppamenti in cui vengono suddivisi gli animali eumetazoi. La distinzione dall'altro grande raggruppamento, Radiata , si basa esclusivamente sul piano di simmetria della loro morfologia: i bilateri sono caratterizzati da un unico piano di simmetria, mentre i radiati ...
16 lug 2020 · The Cambrian explosion was a unique animal radiation ~540 million years ago that produced the full range of body plans across bilaterians. The genetic mechanisms underlying these events are unknown, leaving a fundamental question in evolutionary biology unanswered.
- Peter Heger, Wen Zheng, Anna Rottmann, Kristen A Panfilio, Kristen A Panfilio, Thomas Wiehe
- 2020
Bilaterally symmetrical animals comprise the overwhelming majority of metazoan species. Bilaterality evolved once, early in the evolution of the clade known as Bilateria. The driving force for bilaterality was probably the evolution of active locomotion in search of food.
Eumetazoa are subdivided into radially-symmetrical animals and bilaterally-symmetrical animals and are classified into clade Radiata or Bilateria, respectively. The cnidarians and ctenophores are animal phyla with true radial symmetry. All other Eumetazoa are members of the Bilateria clade.
Most animals are Bilateria. ‘The bilaterians: building a body’ explains that Bilaterians have ‘bilateral symmetry’, meaning they have a single line of mirror-image symmetry running down the centre of the body.
22 ago 2018 · The origin of bilaterian body plans, with through-gut, mouth and anus, is a central topic in animal evolution.
