Figure 90. Geographic distribution of Spongurus pylomaticus. 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, Riedel (1958); B, Petrushevskaya (1967); C, Itaki (2009); D, Original.