 "O. centrina" was only present in 0.6% of the tows during this period at a depth of 100 to 200 m. Regional indexes indicate this species is more common in the western central Mediterranean and lower index in the western and eastern Mediterranean.However, "O. centrina" was completely absent from the Eastern central Mediterranean.In 1948, trawl surveys indicated that "O. centrina" was once present, but uncommon, in the Adriatic.