推荐回答（1个）
如图 ， 项鳍鱼 并非马头鱼、方头鱼 学名
隆头鱼科 Labridae 项鳍鱼属 Iniistius 鱼类 （具体哪种不知）
下图为 安纳地项鳍鱼 Iniistius aneitensis （Xyrichtys aneitensis）
体极侧扁；背缘锐脊状，高陡隆起；头部眼上方圆，往下至吻部几垂直。吻钝；口中大，前位，略可向前伸出；上下颌各具锥形牙一行，前端各具弯形犬齿各一对。前鳃盖边缘具锯齿。体被中大圆鳞；眼下方被有少数鳞列，而未达口後缘；侧线中断，不连续。尾鳍圆形。幼鱼体一致呈黑褐色，吻端至头背淡色，或体呈淡黄褐至褐色，体侧具4-5条黑褐色宽横色，眼下暗色横纹明显。成鱼体呈淡灰色，或略带粉红色；头部淡色，眼下暗色横纹无或不明显；体侧具3-4条暗色宽横带。
栖息在礁沙混合区，幼鱼模拟海藻碎屑随水流漂动，受惊吓时会躲入沙中，夜晚潜沙而眠，属肉食性，以小型底栖动物为食，具性转变。安纳地项鳍鱼 Iniistius aneitensis 在台湾、日本、大堡礁也有分布，只不过在夏威夷首先被命名。 （国内称为 短项鳍鱼 或 离鳍虹彩鲷）
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亦或是 三带项鳍鱼 Iniistius trivittatus ， 俗称 红姑娘仔、红新娘、竖停仔、胭脂冷、角龙、平倍良、三带楔鲷、三带离鳍鲷、三带虹彩鲷
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体极侧扁；背缘锐脊状，高陡隆起；头部眼上方圆，往下至吻部几垂直。吻钝；口中大，前位，略可向前伸出；上下颌各具锥形牙一行，前端各具弯形犬齿各一对。前鳃盖边缘具锯齿。体被中大圆鳞；颊部被鳞片，自眼下方延伸至口缘上方，腹鳍第一软条延长成丝状，但末端未达肛门前缘。体黄绿色，眼下宽横纹明显；体侧上半部具3条暗色垂直带；背鳍、臀鳍及尾鳍背缘皆具粉粉至橘红色缘。
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