蒜形刺藤壶

Armatobalanus allium   Darwin
   

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形态描述

壳圆锥形,白色到淡粉紫色,壳板外表有纵肋,能延伸到裸露的基底,纵肋与横生长纹相交,被分割成小珠状。外常被薄层珊瑚覆盖。幅部较宽,白色或淡粉紫色,顶缘平行于基底,有较粗糙的横隔片,侧缘呈粗糙齿状。翼部薄而宽阔。峰侧板很窄,仅成单肋状。个别标本外表被腐蚀,光滑,壳口卵圆形,不成锯齿。
盖板内膜为淡紫红色,开闭缘膜白色,下面有一圈较深色的环纹。楯板板面稍凹,白色,被淡黄色外膜覆盖,生长脊呈珠状,有睫状毛,背缘稍拱,上部常被腐蚀,顶端淡粉紫色;内面关节脊突出,光滑,拱形,伸出背缘,几乎占据整个背缘的长度,无闭壳肌脊,闭壳肌窝和侧压肌窝清楚。背板薄而易碎,楯缘凹,顶端淡粉紫色,成喙状;外表平坦,覆盖淡黄色外膜,在较低的生长脊处,也有睫状细毛排列,无中央沟;内面白色,关节脊低,关节沟宽而浅,矩宽而短,接近楯缘,其宽度约为长度的4倍,为基缘宽度的1/2,末端斜截与基缘平行,压肌脊很弱,3~4条。
壁板坚实,鞘部长于壁板的上半,粉紫色,无泡状结构,生长线明显,鞘的基缘悬垂下延,与外壁间形成一凹穴,鞘以下有稍扁的强纵肋,与基底结合牢固。
基底坚硬,石灰质,通常凹埋入珊瑚内,从中央向周围有放射状低肋,偶有小管。
上唇中央缺刻每侧一般有3尖齿。大颚5齿,第1~3齿尖锐。小颚切缘较直,上下大刺之间有5~7个中型刺。

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