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ABSTRACT Sex determination in the polychaete, _Capitella capitata_ (species type I), is thought to be a polygenic trait. Since males can be induced to develop into hermaphrodites, crosses

were done to examine the effect of the maternal parent on sex ratio. Female × male crosses produce a 50:50 sex ratio while hermaphrodite × male crosses produce 97 per cent to 100 per cent

males. Differences in sex ratio cannot be explained by sex-specific mortality, and crosses between individuals from different geographical areas give similar results. Sex in this species

appears to be determined by digamety with females as the heterogametic sex. Thus hermaphrodite × male matings should produce all males since hermaphrodites arise from males and are the same

genotype (i.e. ZZ). Female (ZW) × male (ZZ) matings would produce a 50:50 sex ratio. The few females that were produced from a hermaphrodite × male mating were found to be protogynous

hermaphrodites. SIMILAR CONTENT BEING VIEWED BY OTHERS PROTOGYNOUS FUNCTIONAL HERMAPHRODITISM IN THE NORTH AMERICAN ANNUAL KILLIFISH, _MILLERICHTHYS ROBUSTUS_ Article Open access 02 June

2022 TRIOECY IS MAINTAINED AS A TIME-STABLE MATING SYSTEM IN THE PINK SEA URCHIN _TOXOPNEUSTES ROSEUS_ FROM THE MEXICAN PACIFIC Article Open access 10 December 2022 ASEXUALITY SHAPES TRAITS

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_Heredity_, 50, 253–273. Article  Google Scholar  Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Biology Department, University of Pennsylvania, Philadelphia, 19104, PA,

USA Peter S Petraitis Authors * Peter S Petraitis View author publications You can also search for this author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT

THIS ARTICLE CITE THIS ARTICLE Petraitis, P. Digametic sex determination in the marine polychaete, _Capitella capitata_ (species type I). _Heredity_ 55, 151–156 (1985).

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