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Thank You Sir Stephane. I appreciate your Time and Expertise very much.
I will refer to the base as radial node from now on. Thank You.

Meantime, I forgot to add a photo that would've helped you more. I am sorry. I get tired at the end of a day. I noticed that the hypopleuron/meron is a critical feature for determination. The meron of this species is bare. I've added the photo to this message for clarity.

Thank You for the determination. I wish for you a Pleasant Day.