👉 Oligostraca are a group of animals in the class Chordata, characterized by their small size and ability to fit into a single organ or chamber, such as a mouth or stomach, without breaking through or protruding. These organisms typically have a single head with a short neck, followed by a long, slender tail that can move back and forth along the abdomen, creating a vee-nose. They are known for their specialized digestive system, which includes a pair of large teeth
