articular knob
A swelling or irregularity in the integument at a joint, as on either side of a chela at the base of the movable finger or between the abdominal somites at the juncture of the terga and the pleura. [Chace and Hobbs, 1969]. Swelling or irregularity in the shell at a joint of an appendage, or between abdominal somites at the juncture of pleuron and tergum [Butler, T.H.].

Crustacea glossary. . 2011.

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