umbo with a short, weak prickle, sometimes unarmed.
鳞脐具一短,弱的皮刺,有时无刺。
umbo broadly triangular, with a short, stiff, reflexed prickle.
鳞脐宽三角形,具一短,硬,反折的皮刺。
umbo dark brown, slightly projecting, apex obtuse, obviously incurved.
鳞脐暗褐色,有点凸出,先端钝,显而易见弯曲。
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