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 Goniocidaris (primary spine dentition) Description Definition of primary spines: a. "Basal discs" are developed at the base of the shaft being restricted usually to the adapical side and directed towards the centre of the test. b. "Terminal discs" are developed more or less as discs with smooth or indented margins at the distal end of the adapical spines: a. and b. Goniocidaris (Aspidocidaris) parasol.JPG file - 66.86 kB - 530 x 705 pixelsadded on 2011-02-23332 viewsFrom reference Schultz, H. (2011). Sea urchins III: Worldwide regular de...© 2011 Schultz, HeinkeClick here to return to the thumbnails overview |
