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"Invertebrates" encompasses (broadly speaking) spineless animals without legs (e.g. vermiform and snails) or those with more than six legs, hence spiders and crustaceans as well as centipedes and millipedes (Six-legged insects are excluded here as their own section). As a special feature, represented in nearly no other collection area worldwide, the Oberösterreichisches Landesmuseum also houses microscopic, single-celled creatures.

Records date back to 1833, the first evidence dated with collector and find site data – hence scientific – is from 1863. The collection area of "invertebrates" (without insects) has existed since 1992. Summarised presentations on the history of the collections (Aescht 2003, 2012) illustrate its heterogeneity and the correspondingly diverse examination and preparation methods of the various groups.

With over 80,000 batches the Oberösterreichisches Landesmuseum houses Austria’s second largest snail and mussel collection and one of the world’s most important collections of microscopic permanent specimens of microorganisms (ciliates, rhizopods, flagellations). Of national importance are the collections of earthworms and spiders. There is additional data on the phylum of sponges, cnidarians, flatworms, ribbon worms, roundworms, bryozoans, echinoderms and the classes of crustaceans, centipedes and millipedes.

The collection’s preparations are slides, dry and wet specimens. These are supplemented by models (e.g. jellyfish), digital slides, negative and video collections. The number of specimens runs into several millions. Detailed scientific information is recorded in three databases.

Documentation and history of the research of Upper Austria’s invertebrates (without insects) (species inventory, distribution, bibliography, biographies of the researchers).

Specialised publication on the theory of naming using the example of the nomenclature of the family, order and class names of ciliates worldwide (Revision also for the global database "Species 2000").

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