ゆうそうしょうどうぶつ 左右相称動物
1. Bilateria (animals with bilateral symmetry); bilaterian
Wikipedia definition
2. BilateriaThe bilateria are all animals having a bilateral symmetry, i.e. they have a front and a back end, as well as an upside and downside. Radially symmetrical animals like jellyfish have a topside and downside, but no front and back. The bilateralia are a subregnum (a major group) of animals, including the majority of phyla; the most notable exceptions are the sponges, belonging to Parazoa, and cnidarians belonging to Radiata.
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