Food inclusions contain bacteria, bluegreen algae, small dinoflagellates, diatoms, ciliates, and other dinoflagellates. They nourish on diatoms, unicellular green algae or animal protozoa such as flagellates and ciliates. These microbes include viruses, bacteria, algae, heterotrophic protists (such as ciliates and flagellates). This includes diatoms, dinoflagellates, ciliates, and other photosynthetic marine organisms. Protozoa can be split up into three categories&colon; flagellates, amoebae and ciliates. Protozoans, including flagellates, ciliates, sporozoans, and nematodes have been detected in land planarians. In these species (e.g., bacteria, ciliates, dinoflagellates and diatoms), "sex" and reproduction occurs separately. A trichocyst is an organelle found in certain ciliates and dinoflagellates. "A. tonsa" nauplii and adults feed on phytoplankton as well as planktonic ciliates and rotifers. This lifestyle has evolved independently in sediment-dwelling ciliates, oligochaetes, nematodes, flatworms and bivalves. Dileptus is a genus of unicellular ciliates in the class Litostomatea. Like all ciliates, "Paramecia" reproduce asexually, by binary fission. The polyploid macronucleus found in ciliates divides amitotically. A hydrogenosome is a membrane-enclosed organelle of some anaerobic ciliates, trichomonads, fungi, and animals. In addition, some vertebrates, plants and ciliates communicate by using pheromones.