S. V. Vassilenko and V. V. Petryashev (eds): Illustrated keys to free-living invertebrates of Eurasian Arctic Seas and adjacent deep waters. Vol. 1. Rotifera, Pycnogonida, Cirripedia, Leptostraca, Mysidacea, Hyperiidea, Caprellidea, Euphausiacea, Dendrobrachiata, Pleocyemata, Anomura, and Brachyura