New speciments of Lingulocystis Thoral, 1935 (Eocrinoidea, Blastozoa) from the Arenig (Lower Ordovician) of Montagne noire (southern France): intraspecific morphological variability
E. Nardin, New speciments of Lingulocystis Thoral, 1935 (Eocrinoidea, Blastozoa) from the Arenig (Lower Ordovician) of Montagne noire (southern France): intraspecific morphological variability, Annales de paleontologie (1982) , 93(3), 2007, pp. 199-214