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Stockley, B.; Smith, A. B.; Littlewood, T.; Lessios, H. A.; Mackenzie-dodds, J. A. (2005). Phylogenetic relationships of spatangoid sea urchins (Echinoidea): taxon sampling density and congruence between morphological and molecular estimates. Zool Scripta. 34(5): 447-468.
Stockley, B.; Smith, A. B.; Littlewood, T.; Lessios, H. A.; Mackenzie-dodds, J. A. (2005). Phylogenetic relationships of spatangoid sea urchins (Echinoidea): taxon sampling density and congruence between morphological and molecular estimates. Zool Scripta. 34(5): 447-468.
