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Plesiodiadema horridum (apical system + ambulacral plates)
Description a. Apical system: In contrast to P. globulosum, this species has smaller and more numerous periproctal plates. b. Ambulacral plates: The primary tubercles are smaller than in P. globulosum and the areoles of the interambulacral primary tubercles reach the sutures. The buccal plates are naked.a. no scale, test diameter 20 mm; b. Scale 2 mm. JPG file - 109.69 kB - 793 x 483 pixels added on 2011-02-23171 viewsFrom reference Schultz, H. (2011). Sea urchins III: Worldwide regular de... © 2011 Mortensen, Theodor
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