Figure 87. Geographic distribution of Spongosphaera streptacantha. N: total number of positive records [total number of samples where the species was presumably sought], for water-column (above 150 m and below 150 m; plankton and sediment trap materials) and surface sediment materials. Sources: A, Original; B, Original; C, Hackel (1862); D, Hollande and Enjumet (1960).