Globigerina is a
genus of single-celled organisms, members
of which are found floating on the surface of the oceans. Globigerina are protozoans of the order Foraminiferida.
They have a perforated shell, through which they can extend pseudopodia.
After death the shells sink to the ocean floor to form much of the organic
oozes. One species is an indicator of sea temperature, and therefore of
ocean paleoclimatology. Shells coiling to the left indicate that the animals
lived in cold water; shells coiling to the right were of animals that lived
in warm water.