集群坚藤壶

Solidobalanus socialis   Hoek
   

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形态描述

壳低圆锥形或稍狭,白色,光滑,有光泽,半透明,可见到内部的纵肋。幅部窄,无管,顶缘斜,侧缘光滑,翼部宽阔,薄而光滑,顶缘几乎平行于基底。壳口较大,菱形到五角形,边缘略成齿状。
盖板内膜为淡紫色,开闭缘膜白色,有3对紫色的对称斑。楯板较窄,开闭缘有齿,外面生长脊低,脊间距离较大;内面白色,关节脊发达,长度超过背缘之半,下端斜截;有低而细的闭壳肌脊,此脊与关节脊之间另有一低的纵脊,其上端与闭壳肌脊会合,形成倒“V”形,闭壳肌窝浅;压肌窝稍深,界限模糊。背板较宽阔,峰缘稍拱,有细毛,基缘稍长;外表面有低的生长脊,中央沟很浅;内面关节脊明显,关节沟宽阔而浅,侧压肌脊清楚,4~6条,下端突出于基缘之外。矩较短,末端钝圆,其侧缘到基楯角的距离约等于矩宽度的2/3。
壁板无管道,鞘部较短,横生长纹不很清楚,基缘下延与壳板内壁间形成一浅凹穴,鞘下的纵肋简单。
基底薄,周围有向内伸出的浅沟,但不能达到基底的中心。
上唇中央缺刻每侧3个较锐的齿。大颚有5个较尖的齿。小颚上下大对刺间有3个中型粗刺。

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