Figure 4 in Review of the genus Zygothuria Perrier, 1898 and the Atlantic group of species of the genus Mesothuria Ludwig, 1894 (Synallactidae: Holothuroidea) with description of the new species Mesothuria milleri sp. nov.

Figure 4. Mesothuria milleri sp. nov. Ossicles (A–H) and segments of calcareous ring (I): (A–E,G–I) from holotype; (F) BIOICE, sample no. 2861 (St. 733). (A–E) disks; (F–H) spires. Scale bars 0.04 mm for A–E; 0.06 mm for F,G.