Geographical distribution of the Mediterranean species of Microporella studied in this paper, either based on examined material (larger symbols) or on data from the literature (Kukliński and Taylor 2008 for M. ciliata; Hayward and McKinney 2002; Chimenz Gusso et al. 2014 and Di Martino et al. 2020a for M. modesta; André et al. 2014 and Achilleos et al. 2020 for M. verrucosa) that include SEM images (smaller symbols). Black circles: M. appendiculata; grey circles: M. bicollaris sp. nov.; white circles: M. ciliata; grey asterisk: M. ichnusae sp. nov.; grey squares: M. modesta; black squares: M. pachyspina sp. nov.; black cross: Microporella sp. A; black asterisks: M. verrucosa.