Figure 95. Geographic distribution of Stylodictya aculeata. 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, Boltovskoy and Vrba (1988); B, Original; C, Petrushevskaya (1967).