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Echinothuriidae (ends of oral primary spines)
Description In all species of the echinothuriids the oral primary spines are equipped with a distal hoof. Distal end of oral spine of (a) Araeosoma coriaceum; (b) Araeosoma fenestratum; (c) Calveriosoma hystrix; (d) Hygrosoma luculentum [left to right].Scales 2 mm. JPG file - 53.18 kB - 945 x 759 pixels added on 2011-02-231 292 viewsFrom reference Schultz, H. (2011). Sea urchins III: Worldwide regular de... © 2011 Mortensen, Theodor
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