Diatom Diatoms are unicellular algae whose cells are enclosed by a silicate shell (silicon dioxide). They live in salt or fresh water and are the main primary producers of organic matter and produce a large part of atmospheric oxygen. Scanning electron microscope, magnification 980:1 (at 12x10cm)
Musing with WritingMuse . Beautiful picture of magnified grains of sand, the microcosm. William Blake: "To see a world in a grain of sand, And heaven in a wild flower, To hold infinity in the palm of your hand, Eternity in an hour. " by sandy Penny
You see the conjugation of two tintinnids. "The two cells form a bridge between their cytoplasmas, the micronuclei undergo meiosis, the macronuclei disappear, and the haploid micronuclei are exchanged over the bridge. The cells separate and form new macronuclei from their micronuclei" (cfr. "Ciliate" in Wikipedia).