This dataset is the first source of information about diversity, hosts and distribution of symbiotic copepods (Copepoda, Crustacea) reported living on echinoderms of the World. The dataset unites data on all (2080) records of 290 species of copepods representing 96 genera, 35 families and 3 order discovered worldwide associated with 240 species of echinoderms representing 134 genera, 66 families, 24 orders and five classes. It includes information about taxonomy of hosts and symbionts, the names and coordinates of all known (477) sampling sites, the depth and date of all sampling events with such notes in original sources (1401 and 1694, correspondingly), as well as references to almost all (233 from 236) publications. Here is a list of articles that have not yet been found, as a result of which data from them is missing in the dataset. – Austin, W.C. (1985). An annotated checklist of marine invertebrates in the cold temperate northeast Pacific. Khoyatan Marine Laboratory, Cowichan Bay, British Columbia 3:505-546. – Bartsch, I. (1994). Siphonostomatoide copepoden auf ophiacanthiden (Ophiuroidea). Beschreibung von drei Cancerilla-arten (Cancerillidae, Copepoda) aus der Antarktis. Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut, Hamburg 91:61-76. [In German.] – Boeck, A. (1859) Beskrivelse over tvende nye parasitiske Krebsdyr. Artotrogus orbicularis og Asterocheres liljeborgii. Forhandlinger i Videnskabs-Selskabeit Christiania 1859, 171-182. – Brun, E. (1976). Ecology and taxonomic position of Henricia oculata Pennant. Thalassia Jugoslavica 12, 51-64. – Calvez, J. le. (1938). Parachordeumium tetraceros n. gen. n. sp., Copépode gallicole parasite d'une Ophiure de Villefranche-sur-Mer. Comptes rendus du Congrès des sociétés savantes de Paris et des départements. Section des sciences. 71:259-263. – Cherbonnier, G. (1951). Inventarie de la faune marine de Roscoff: Echinodermes. Trav. Stn biol. Roscoff (N.S.), 2, Suppl. 4: XV + 1-15 – Gotto, R.V. (1954). A copepod new to the British Isles and others hitherto unrecorded from the Irish coastal waters. Irish Naturalists' Journal 11(5):133-135. – Hamond, R. (1961). Marine Fauna. In: Norwich and Its Region. British Association for the Advancement of Science. :75-77, figs. 1-3. – Hartog, C. Den. (1961). Zuid-Bevelandse sterrenshow. Zeepaard 21(2):28-30. – Kossmann, R. (1877a). Zoologische Ergebnisse einer im Auftrage der Königlichen Academie der Wissenschaften zu Berlin ausgeführten Reise in die Küstengebiete des Rothen Meeres, 1(4), Entomostraca, 1. Theil, Lichomolgidae. Verlag von Wilhelm Engelmann, Leipzig 4:1-24, pls. 1-6. – Sebastian, M.J. (1972). Copepod associates of South Indian invertebrates. Ph.D. Thesis, University of Kerala, Trivandrum, India 344pp. – Stephensen, K. (1935). Two crustaceans (a cirriped and a copepod) endoparasitic in ophiurids. Danish Ingolf-Expedition 3(12):1-18, figs. 1-10, chart.