USGS VOUCHER SHEET I 8 I 2) Date: Taxa: Mollusca: Bivalvia/Pyramidellidae Prepared by: 19 Apri|2016 Susan McComrick Deseription: . . . . . . . Shell elongate, conical, and dextrally coiled with 7-8 whorls and sharp apex Sutures well-defined with a deeply impressed channel below the suture. Two grooves present on each whorl (common name: two groove odostome) Aperture oval, with the lower edge of the lip projecting outwards. Columella with an oblique fold inside the aperture (not visible in illustration). Color dull white with a thin brownish periostracum and a horn-colored operculum Shell height 4-6 mm. Additiona]. Information : RANGE: Boston Harbor; Prince Edward Island to Virginia; San Francisco Bay FIABITAI: Oyster reefs, mud bottoms, docks INTRODUCTION: Probably from the Atlantic coast with commercial oyster culture Comments : The first definite record of O. bisuturalis on the West Coast was in 1962, near Menlo Park, South San Francisco Bay, California. It was found in 1977 near Fremont, CA and in 1984 near Palo Alto, CA. It could have been introduced with Eastem Oysters in the late 19th or early 20th century. However, it has a planktotrophic larva and could have been introduced more recently with ballast water. It is an ectoparisite that feeds on the body fluids of clams and other invertebrates. I].lustrations aperature lip Photo: Susan McCormick Taxonomy: I have continued to call this species Odetta bisuturalis although the WoRMS (World Register of Marine Species) lists it as Boonea bisuturalis. As recently as20l2,the genus Odetta was used by Lee II and Reusser in the Atlas of Nonindigenous Species Information System, although they mention that WoRMS does not list it as a valid name. Fofonov et al. (2003) uses Boonea in their NEMISIS website; however, J. Carlton, one of the authors of that page later as editor of Light's Manual (2007), accepts J. H. Mclean's use of Odena. Other sources have continued to use the genus Odostomio. In our case, I think consistency is important and we can always change the name in the future as more information is available in the literature. USGS VOUCHER SHEET Odetta bisuturalis P. 2 References: FofonoffPW, Ruiz GM, Steves B, & Carlton JT. 2003. CaliforniaNon-native Estuarine and Mari Organisms (Ca1-NEMO) System. http://invasions.si.edu/nemesis/. Access Date: 19-Apr -2Afi Lee II, H. and Reusser, D.A., 2012-At1as of Nonindigenous Species Information System. Office Research and Development, National Health and Environmental Effects Research Laboratory. of Microsoft Access database. Mclean, J.H.,2007. Shelled Gastropoda.Pp. Tl3-753 IN: The Light and Smith Manual: lntertidal Invertebrates from Central Califomia to Oregon. 4th edition.James T. Carlton ed. Berkeley, California, U.S.A.: University of California Press, 100lpp.