The Demosponge Genus Leptomitus and a New Species from the Middle Cambrian of Spain García-Bellido, Diego C. ; Gozalo, Rodolfo ; Chirivella Martorell, Juan B. ; Liñán, Eladio Abstract Publication: Palaeontology Pub Date: March 2007 DOI: 10.1111/j.1475-4983.2007.00635.x Bibcode: 2007Palgy..50..467G