Examination and comparison of Fragilaria candidagilae sp. nov. with type material of Fragilaria recapitellata, F. capucina, F. perminuta, F. intermedia and F. neointermedia (Fragilariales, Bacillariophyceae) - Delgado, C.; Novais, M.; Blanco, S.; F.P. De Almeida, S. (Phytotaxa, 2015)