Relevant Synonyms Syrnola lorioli Hornung and Mermod, 1924 Misidentification -  photo: J. J. van Aartsen

SHORT DESCRIPTION Shell conical, turriculated, with a nearly smooth surface, with only some faint streaks in a spiral direction. The later whorls have a distinct keel running just above the suture of the following whorl, and continued on the body whorl. As the other species of the subgenus Megastomia, O. lorioli has the inner part of the outer lip with a few teeth. The top-whorls are intorted ("type C", according to van Aartsen, 1987). color : colorless to white. common size : small, 2.5 mm (holotype). DISTINGUISHING CHARACTERISTICS This species may be confused with other Mediterranean species of the subgenus Megastomia [e. g., O. (M.) conoidea (Brocchi, 1814), O. (M.) conspicua Alder, 1850, O. (M.) sicula Philippi, 1851], all characterised by a number of narrow teeth inside the outer lip, but O. lorioli is different on the basis of the white color of the shell, the not helicoid, but planorbid, top-whorls ("type C" according to van Aartsen) and the shell surface with very feeble spiral threads. BIOLOGY / ECOLOGY Pyramidellids are ectoparasites, mainly of sedentary polychaetes and molluscs. habitat : the holotype was collected at 10-30 m depth.

1st Mediterranean record Israel, 1987 [1974]. DISTRIBUTION Worldwide: Red Sea. Mediterranean: recorded first from Haifa, Israel in 1974 (van Aartsen, 1987). ESTABLISHMENT SUCCESS Uncommon. speculated reasons for success : - MODE OF INTRODUCTION Possibly via the Suez Canal. IMPORTANCE TO HUMANS None.

KEY REFERENCES Buzzurro G. and Greppi E., 1995. Note sul materiale tipico di origine lessepsiana della collezione Hornung & Mermod. Notiario del CISMA, 17: 5-16. van Aartsen J. J., 1987. European Pyramidellidae: 3. Odostomia and Ondina. Bollettino Malacologico, 23(1-4): 1-34. van Aartsen J.J., Barash A. and Carrozza F., 1989. Addition to the knowledge of the Mediterranean mollusca of Israel and Sinai. Bollettino Malacologico, 25(1-4): 63-76.   FEEDBACK / COMMENTS TO AUTHORS

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