The collections of the department of Arthropods include dry and wet specimens, as well as some "unclassified" samples that are indirectly related with Arthropods.

The dry specimens are Insects in their vast majority (several thousands), with almost 85% of them being Coleoptera. There are also several hundreds of pinned Orthoptera, Lepidoptera and Odonata.

Several thousands of other Arthropods are the wet specimens (glass jars with 75%-100% alcohol). The collection of Spiders outnumbers 40,000 samples, Centipeds and Scorpions number several hundreds of wet specimens and are sorted on species level. All other arthropods not mentioned above, are kept also as wet specimens and sorted on family or order level.

The "unclassified" samples are mainly various Arthropod products like wasp nests or cocoons.

Beside the traditional collections, many specimens are kept in -20 0C for DNA analysis and other molecular techniques.
Geographicaly, the majority (~85%) of the samples originate from Greece (NHMC expeditions, student field excursions, etc.) and the adjuced Eastern Mediterranean countries (~15%). Relatively small number of samples originate from other european countries or even other continents.