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 Plonocidaris - comparison with Prionocidaris Description Primary spines: a. Prionocidaris bispinosa: The shaft is slender and the thorns are not verticillate except in the lowermost whirl being developed only on the adapical side of the shaft., b. Plococidaris sp.: The thorns are arranged in distinct whirls but only on the adapical side of the shaft., c. Plococidaris verticillata: The whirls of thorns are encircling the whole shaft.a. Length 62 mm; Western Australia, b. Length 34 mmN Philippines, c. Length 21 mm; Philippines.JPG file - 71.60 kB - 496 x 839 pixelsadded on 2011-02-23527 viewsFrom reference Schultz, H. (2011). Sea urchins III: Worldwide regular de...© 2011 Schultz, Heinke Click here to return to the thumbnails overview |
