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J. Moll. Stud. (1999), 65, 99-109
© The Malacological Society of London 1999

Morphological and Molecular Resolution of a Putative Cryptic Species Complex: a Case Study of Notoacmea Fascicularis (Menke, 1851) (Gastropoda: Patellogastropoda)

W. Brian Simison1 and David R. Lindberg2

Department of Integrative Biology and Museum of Paleontology University of California, Berkeley, CA 94720-4780, USA

1Email: simey{at}socrates.Berkeley.Edu

2Email: davidl{at}ucmp1.Berkeley.Edu

Evidence that Notoacmea fascicularis (Menke, 1851) is a complex of at least two distinct taxa of species rank is ambiguous. A discriminant function analysis of conchological data shows a weak geographic effect, while radular morphology clearly delineates two sympatric groups with rare intermediates. Lastly, molecular data (mt cytochrome c oxidase subunit I) suggests a single species and a geographic effect. We consider N. fascicularis to be a single taxon, variable for radular lateral tooth morphology. In the past these two different radular morphologies would be indicative of generic rank. Our knowledge of the intraspecific variability of most gastropod characters is poor, and this makes specific identifications or groupings based on single character systems such as the radula precarious. Adequate sampling and evaluation of population-level character states (conchological, anatomical and molecular) is needed to identify as well as falsify cryptic species complexes.

(Received 28 August 1997; accepted 6 May 1998)


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