1 - Algae Micrasterias apiculata, single cell from above
2 - Algae Micrasterias thomasiana, half during cell division
3 - Algae Euastrum pecten, single cell from above freshwater green algae from the Desmids orders. Though unicellular they are divided into two compartments separated by a narrow bridge. Each compartment contains one chloroplast and no flagella.
4 - Algae Pediastrum darwinii, a nonmotile coenobial green algae that inhabits freshwater environments
5 - Foram Lenticulina anaglypta this Foraminifera is a marine amoeboid protozoa that forms its shell from calcium carbonate
6 - Diatom Campyloneis grevillei top view. Diatoms are unicellular algae encased within a cell wall made of silica.
7 - Radiolarian Tetracranastrum bifurcatum
8 - Radiolarian Collosphaeridae sp.
Radiolaria are unicellular eukaryotes that produce intricate mineral skeletons of silica
9 - Amoeba Proteus in active stage. This small protozoan uses tentacular protuberances called pseudopodia to move and phagocytose smaller unicellular organisms. From Leidy “a ramose individual with the posterior part as a mulberry-like mass”
10 - Copepod Clytemnestra scutellata female a small planktonic marine crustacean
11 - myovirus bacteriophage a virus that infects bacteria, it carries genetic material such as DNA in the outer icosahedral protein capsid which it injects into a host cell
12 - Mitochondrion a membrane-enclosed organelle found in most eukaryotic cells. They are sometimes described as "cellular power plants" because they generate most of the cell's supply of adenosine triphosphate (ATP), used as a source of chemical energy
13 - Optical Microscope a type of microscope which uses visible light and a system of lenses to magnify images of small samples. Optical microscopes are the oldest design of microscope and were possibly designed in their present compound form in the 17th century

1,3,4,5,6,7,8,10 are based on drawings from ‘Kunstformen der Natur’ by Ernst Haeckel, 1899

9 based on a drawing from 'Fresh-Water Rhizopods of North America' by Joseph Leidy, 1879