ABSTRACT
This chapter explores the definitive listing of the reproductive diversity for every class of animals. A few groups are listed as classes or phyla although they may not deserve that rank; this placement is not intended as final opinion on their status. They are included to permit assessment of their true position. In Phylum Protozoa, the unicellular organisms are extremely diverse. They are marine, fresh-water, saprophytic, saprozoic, ectoparasitic, or endoparasitic, and they occur in water films away from bodies of water. In many Rhizopoda and others there is no sexual reproduction of any sort; the asexual reproduction is by binary or multiple fission, budding, or plasmotomy. Plasmogony or temporary cytoplasmic union also occurs in the Lobosa. Autogamy in Actinophrys and Actinosphaerium consists of division into two daughter cells which, after two typical maturation divisions, fuse to form a zygote. This is also found in the Lobosa.
