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By: Casanueva, Maria E. - Berrios, Alvaro M - Peredo, A Ariel A - Martinez, Rodrigo IType: ArticleIn: Gayana. ZoologíaVolume: 58Series:Issue:Date: 1994Page Range: 61--69Publication Info: [Concepción, Chile], Universidad de Concepción, Instituto de Biología, 1961-1998Subjects: