Abstract
Populations of three species of the genus Heterocypris: H. margaritae Margalef, 1961, H. antillensis Broodbakker, 1982, and H. punctata Keyser, 1975, sampled in the Caribbean region are studied. (1) An attempt is made to correlate differences in mean carapace length between samples from different islands and within intra-insular samples, with environmental factors. (2) Differences in the ecology of the three species are determined. (3) The distribution of the three species is discussed. (4) Related species are compared. Populations of three species of the genus Heterocypris: H. margaritae Margalef, 1961, H. antillensis Broodbakker, 1982, and H. punctata Keyser, 1975, sampled in the Caribbean region are studied. (1) An attempt is made to correlate differences in mean carapace length between samples from different islands and within intra-insular samples, with environmental factors. (2) Differences in the ecology of the three species are determined. (3) The distribution of the three species is discussed. (4) Related species are compared.

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