title: Shell microstructure of Lacunosella Wiśniewska (Brachiopoda, Rhynchonellida) from the Lower Cretaceous of Crimea; First finds of casts of outer epithelial cells of the mantle in rhynchonellids
abstract: First study of the shell microstructure of Lacunosella Wiśniewska, 1932 revealed bilayered shell wall and peculiarities in the structure of fibrous layer and separate fibers. Casts of cuboidal cells of the outer epithelium of the mantle on the inner valve surfaces are described for the first time for the Mesozoic rhynchonellids. The comparative characterization of the shell microstructure of the family Basiliolidae (superfamily Pugnacioidea) and families Praecyclothyrididae and Cyclothyrididae (
journal: Paleontological Journal