Final answer:
Examples of fish that do not fall under the typical fish body shapes include eels with their slender bodies, rays which have flat, wide shapes with wing-like fins, and chimaeras featuring a cartilaginous skeleton and unusual body forms.
Step-by-step explanation:
Fish exhibit various body shapes and fin arrangements that sometimes do not correspond to the common types like those exhibited by ray-finned or lobe-finned fish. Three examples of such fish are eels, which have elongated bodies and reduced fins, making them very maneuverable; rays, which have wide, flat bodies and fins that allow them to glide along the ocean floor; and chimaeras, also known as ghost sharks, that have a cartilaginous skeleton and a distinctive appearance differing from typical fish.
These unique body forms offer specific adaptations to their environmental niches. Eels' bodies allow them to navigate through complex, confined spaces within reefs or the seafloor. Meanwhile, rays can often be found buried under sand, using their wing-like pectoral fins to remain camouflaged from predators and to ambush prey. Chimaeras have deep-sea adaptations, exhibiting traits such as a soft and reduced skeleton made of cartilage and a fusiform body shape.