蓝笠藤壶

Tetraclita coerulescens   Spengler
   

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形态描述

壳低圆锥形,壳口菱形到五角形,壳表有细纵肋,上部蓝绿色,下部浅黄色,常覆盖有透明膜,生长线有细短毛,被腐蚀的个体白色,蓝绿色板管内物质裸露,或形成短纵肋。幅部宽阔,有横脊和蓝绿色斑,顶缘斜,关节缘呈齿状。翼部白色光滑,顶缘略斜。鞘部居壁板的上半,淡蓝色。壁板厚,充满多排卵圆形的纵管。基底膜质。
楯板较厚而宽阔,外表有轻微的纵沟,生长脊波状,在开闭缘呈粗齿,外膜在生长脊处有细短毛,有蓝色或粉红色纵带;内面白色,常有蓝绿色斑;关节脊宽阔突出,关节沟宽而深,闭壳肌脊较短,上部与关节脊接合,形成一个小的深窝,闭壳肌窝很清楚,侧压肌脊较短小,多条,吻压肌脊4~8条。背板较宽阔,白色,生长脊在楯缘成突出尖齿(但在腐蚀严重的涠洲岛标本不明显),有清楚的中央沟,内面三角形顶叶突出,但不成喙,有时完全磨损,关节脊不突出,关节沟深而宽阔;矩较宽而短,末端钝圆或斜截,与基楯角明显分开,侧压肌脊发达,9~11条。
上唇中央缺刻较浅,每侧有1~4钝齿。大颚4齿,下角栉状。

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