Palaeobiology and evolution of the Late Cenozoic freshwater molluscs of the Turkana Basin: Iridinidae Swainson, 1840 and Etheriidae Deshayes, 1830 (Bivalvia: Etherioidea). Journal of Systematic Palaeontology, 7(2), June 2009: 129-161. 139 [Zoological Record Volume 145]