丂摦暔偺懱偺憡徧惈 (symmetry) 偼丆偦偺惗妶條幃偵傛傝堎側傞丏憡徧偲偼惗暔偺宍懺偑丆揰丆慄丆柺偵傛偭偰摍壙偵嬫暘偝傟傞偙偲偱偁傞丏晜梀惈丆屌拝惈傗掕嵗惈偺摦暔偼丆廃埻偐傜偺巋寖乮曔怘幰傗塧惗暔偺懚嵼乯傪姶抦偡傞偨傔丆慡曽岦傊乮偁傞偄偼屌拝柺埲奜偺曽岦乯懳墳偱偒傞傛偆偵媴憡徧偁傞偄偼曻幩憡徧偺懱傪傕偮丏堦曽丆嵍塃憡徧偺懱偼丆塣摦惈偵桪傟丆姶妎婍姱偑懱偺慜曽偱敪払偡傞丏
侾乯媴憡徧 spherical symmetry丂
丂丂仛儃儖儃僢僋僗側偳晜梀惈偺尨惗摦暔
俀) 曻幩憡徧 radial symmetry乮oral-aboral axis 岥晹-斀岥晹傪娧偔懱幉乯
丂丂仛巋朎摦暔傗灆旂摦暔側偳屌拝偁傞偄偼掕嵗惈偺摦暔
俁乯擇曻幩憡徧 biradial symmetry丂
丂丂仛晜梀惈偺桳孂摦暔
係乯嵍塃憡徧丂bilateral symmetry (frontal plane 妟柺丆慜摢暯柺丟median plane
惓拞柺丟sagittal plane 栴忬柺丟transverse plane 墶抐柺乯
丂丂仛懡偔偺屻惗摦暔乮俀師揑偵晄憡徧偲側傞傕偺偁傝丏椺偊偽丆擃懱摦暔偺暊懌椶乯
丂摢壔丂cephalization
丂懱偺慜曽偵恄宱愡傗岥偑埵抲偟丆摢晹偑宍惉偝傟傞偙偲丏懱偺嵍塃憡徧壔偵傛傝丆塣摦惈偑崅傑傞偲偲傕偵丆懱慜曽偵摢晹偑宍惉偝傟傞偙偲偱丆傛傝岠棪揑偵塧偺扵嶕傗曔怘偑偱偒傞傛偆偵側偭偨丏
俆乯晄憡徧丂asymmetry丂
丂丂仛傾儊乕僶傗奀柸摦暔