Little Foot is an australopithecine, classified as different from Lucy's species, Australopithecus afarensis.
Notes on verification
Multiple independent, high-quality sources (National Geographic, Live Science, Science.org, CBC, Wikipedia) corroborate that Little Foot is classified as distinct from Australopithecus afarensis (Lucy's species), though the exact species designation (africanus, prometheus, or unnamed) remains debated among researchers.