"Abundance of Syracosphaera (ITIS: 2234: WoRMS 115084) [Subcomponent: coccoliths] per unit volume of the water body by identification and counting by scanning electron microscopy (SEM)"@en . . "SDN:P01::ABD07057" . "Counts of a given biological entity using scanning electron microscopy normalised to a specified volume of fresh or salt water"@en . .