TREASURE OF RUSSIAN SHELLS, Supplement 4. Illustrated catalogue with selected identification keys of the recent fresh- and brackish-water pectinibranch molluscs (Gastropoda: Pectinibranchia) of Russia and adjacent regions. By Roman Egorov, February, 2006. 88 pages, 1 map, VI Plates, more than 250 figs. In English.

The given publication is final summarized compendium of the continental pectinbranch molluscs of the former USSR territory which includes fresh- and brackish-water representatives of this subclass. The terrestrial representatives of pectinibranch molluscs from this territory was examined early [Egorov, Greke, 2003]. Since number of water species of pectinibranch gastropods significantly exceeds the number of terrestrial ones, author limits by publication of the systematic list of species discovered on indicated territory with notes on original descriptions and distributions for each species. Also, data on type material is given for some species. The catalogue includes identification keys and images of shells of the species distributed on the territory of Russia and, partly, from the European part of the former USSR territory. Other species known from the territory former USSR shortly listed and partly illustrated. Given catalogue was prepared on published data, but some information about storage of the type material is original. Data on distribution of species cited by original descriptions and recently published works [Starobogatov et al., 2004, Kantor, Sysoev, 2005, etc.]. In addition, catalogue of endemic pectinibranchs of the Baikal Lake is presented. This catalogue contains listing of all known species with data on the original description, short synonymy, two plates of illustrations of some species and separate list of references. Author did not use subgeneric division in "Baikalian" catalogue because this category is unclear for most species yet. The general catalogue doesn’t include endemic pectinibranchs of the Caspian and Aral Seas for they are marine animals. However, some marine species which live in very freshened parts of seashores (lagoons and estuaries) are included in general catalogue. Author accepted the system and nomenclature of the class Gastropoda offered and published by Golikov&Starobogatov [1989] with some corrections based on subsequent publications [Prozorova, Starobogatov, 1991; Sitnikova, 1991, etc.]. The lists of bibliography contains 195 publications. In total, the catalogue contains data on 350 species of fresh- and brackish-water pectinibranch molluscs known from the territory of the former USSR for now.

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