Abstract
ABSTRACT Sewellina subtilis, new species (Crustacea, Copepoda, Harpacticoida), from the coast of Sri Lanka, is described and characterized as follows: a small 1-segmented P, exopodite; a strong seta on the first segment of P, endopodite in both sexes; P, showing sexual dimorphism, formed in the holotype by a narrow and elongate lamina ending in a strong spine, accompanied by a short spur and an external seta. A comparison of the new species with Sewellina reducta Krishnaswamy, 1956 (including the publications of Krishnaswamy, 1957, and Rao and Ganapati, 1969), required a review of the genus. Parasewellina prima, new genus, new species, also from Sri Lanka is placed in the Psammopsyllinae since it has a 2-segmented exopodite and a 1-segmented endopodite in P3 and P4. Remarks on the subfamily Psammopsyllinae and data on ecology and sampling sites are given.
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