There are a few synonyms for the term "Subphylum Cephalochordata" that may be useful to know for those studying or researching this group of animals. One alternate name for this subphylum is the "Acrania," which is sometimes used to refer to the group of animals that do not possess a cranium or skull. Another potential synonym is "Lancelets," which is a common name used to refer to certain species within the Cephalochordata group. Additionally, some researchers may refer to these animals as "Branchiostomatids," which is a family within the subphylum that includes several species of lancelets. Knowing these alternative names and synonyms can make it easier to find information about Cephalochordata from a variety of sources.