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The present study gives new data on a poorly studied group of brackish harpacticoids from the North-West coast of the Black Sea, Ukraine. Seven harpacticoids species (Crustacea, Copepoda) collected in July 1988 from the Budakskyi (Shabolatskyi) Lagoon are reported.

The present study reports a new locality of Nitokra spinipes spinipes Boeck, 1865. During 1988-1989 a large number of Nitokra spinipes spinipes were found in the biofilter at the aquaculture station in Pomorie Town, on the Pomorie Lake coast. This is the first record of the Nitokra spinipes spinipes found trapped in the technical equipment for water purification used in aquaculture.

Thirty one Crustacean species from 21 localities are reported from groundwaters of Vratchanska Planina Mountain. The list of species is completed on the basis of available bibliographic sources and original data of authors. Faunal samples are collected at the natural access to underground ecosystem, caves and springs. Eight species are stygobionts: three cyclopoids, one harpacticoid, three isopods and one amphipod, or 6.6 % of all the Bulgarian stygobiont Crustacean fauna. Elaphoidella balkanica Apostolov and Protelsonia lakatnicensis (Buresch & Gueorguiev) are local endemic species of the Vratchanska planina Mountains.

The author reports 19 harpacticoid species (Crustacea, Copepoda) sampled from the marine coastal and brackish waters on the Icelandic shore of the Atlantic Ocean in June and July 2004.

All available data on the distribution of freshwater harpacticoids (Copepoda) in Grande de Tierra del Fuego Island are summarized. Attheyella (Delachauxiella) nuda Lëffler, 1961 inhabiting wet mosses in the valley of Martial Glacier near Ushuaia is newly established. The site marks the southernmost distribution of the species in Argentina.

We studied the qualitative composition of zooplankton of the Kerid Crater Lake. We found 10 taxa from which five rotifers and two lower crustaceans. Three of the recorded species are new to the freshwater fauna of Iceland: the rotifer species Keratella cf. americana Carlin, 1943 and Colurella sulcata (Stenroos, 1898), and the crustacean harpacticoid Bryocamptus (Bryocamptus) minutus (Claus, 1863).