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.