Figure 21 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 21. Population structure of Zygothuria lactea in Porcupine Abyssal Plain, during the RRS Discovery cruise 105 and RRS Challenger cruises 505, 514, 517, 522, during the years 1979–85. Top right numbers are RRS Discovery or RRS Challenger station numbers.