High Quality Content by WIKIPEDIA articles! Sepioteuthis lessoniana, commonly known as the bigfin reef squids or oval squids, is a commercially important species of loliginid squid. They are one of the three currently recognized species belonging to the genus Sepioteuthis. Studies in 1993, however, have indicated that bigfin reef squids may comprise a cryptic species complex. The species is likely to include several very similar and closely related species.