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Phyllacanthus irregularis (ambulacrum, close-up)
Description Close-up of ambulacrum: The pores of each pair are connected by a shallow furrow, they are conjugate. The interporiferous zone is densely packed with small tubercles, the marginal tubercles are more or less larger, forming an irregular row at each side.Scale 5 mm. Negros, Philippines. JPG file - 241.48 kB - 1 417 x 1 044 pixels added on 2005-02-23292 viewsFrom reference Schultz, H. (2006). Sea urchins: A guide to worldwide sha... © 2005 Schultz, Heinke
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