Harpacticoid copepods represent the order Harpacticoida within the subphylum Crustacea, class Hexanauplia, subclass Copepoda, commonly found in bottom sediments of various water bodies as well as in the groundwater. They belong to the most frequent components of the meiobenthos (= benthic meiofauna, an ecological category defined operationally as invertebrate metazoans dwelling in bottom sediments, passing the 0.5–1 mm and retained on the 0.032–0.063 mm mesh size sieves; Giere, 2009), particularly abundant in sedimentary environments of marine (fully saline) areas. Following the recent revision of the order Copepoda (Khodami, McArthur, Blanco-Bercial, Martinez Arbizu, 2017) and in accordance with the World Register of Marine Species (www.marinespecies.org), harpacticoids group at present 53 families represented by about 5,000 species described so far. However, the number of harpacticoid species in marine sediments is estimated at even up to 30 thousand (Huys, Gee, Moore, Hamond, 1996). European seas support more than 800 described species (Giere, 2009). In addition, about 1,000 species belonging to 13 families live in freshwater habitats; some species (inter alia those of the family Parastenocarididae) are adapted to subterranean waters.

Introduction

1. Notes on harpacticoid morphology and identification

2. A guide to harpacticoid copepods

2.1. General characteristics of families represented in the southern Baltic Sea harpacticoid

fauna

2.2. A guide to harpacticoid species of the southern Baltic Sea

References

List of figures

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