CARRERA, MARCELO G. & JöRG MALETZ - Ordovician sponge spicules from Spitsbergen, Nevada and Newfoundland: new evidence for hexactinellid and demosponge early diversification.

2014. Journal of Systematic Palaeontology Vol. 12; pp. 961-981, illustr. Orig. extract, stapled, very good, 4to.

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