Albert Lleal / Diatom (Amphora sp) SEM close-up view of fossil at 3500x magnification, approximately 2000 years old, found in lake near Huesca, Spain

Albert Lleal / Diatom (Diadesmis contenta) group SEM close-up view at 1400x magnification

Colin Monteath / Didymo (Didymosphenia geminata) warning sign, diatom bloom seriously affecting South Island waterways and rivers, Mount Cook National Park, New Zealand

Kevin Schafer / Red tide, and algal bloom of phytoplankton, Sea of Cortez, Mexico

Albert Lleal / Diatom (Navicula sp) fossil, SEM close-up view at 1400x magnification, approximately 2000 years old, found in lake near Huesca, Spain

Albert Lleal / Diatom (Amphora sp) SEM close-up view of fossil at 3500x magnification, approximately 2000 years old, found in lake near Huesca, Spain

Albert Lleal / Diatom (Cyclotella sp) fossil SEM close-up view at 2800x magnification, approximately 2000 years old, found in lake near Huesca, Spain

Albert Lleal / Diatom (Diadesmis contenta) group SEM close-up view at 2800x magnification

Yva Momatiuk & John Eastcott / Orca (Orcinus orca) showing yellow coloration of skin caused by diatom infestation, Prospect Point, Antarctica

Albert Lleal / Diatom chain at 30x magnification, Spain

Albert Lleal / Diatom (Pleurosigma sp), Spain

SINCLAIR STAMMERS / Mixed diatom (Diatoma genus) frustules cleaned with acid and lit with interterence contrast lighting

SINCLAIR STAMMERS / Mixed diatom (Diatoma genus) frustules cleaned with acid

Kim Taylor / Marine diatom {Grammatophora sp} on Bryozoan

Kim Taylor / Marine diatom {Bacillariophyceae} on Bryozoan.

Kim Taylor / Chains of Diatoms {Diatoma elongatum} on freshwater algae, UK.