De Nederlandse Hooiwagens (Opiliones) provides a key for identifying Dutch harvestmen. The introductory chapters deal with general aspects of opilionids, such as their morphology, biology and life cycle. With the key the 30 Dutch species and 4 additional species found in adjacent regions (Megabunus diadema, Lacinius horridus, Leiobunum limbatum and Leiobunum rupestre) can be identified, using mainly field characters. The species accounts focus on identification and provide original drawings of relevant details. The distribution in the Netherlands is given as well as some notes on phenology and habitat.
Members of the Harvestman Recording Scheme (HRS) were so impressed with the quality of Hay Wijnhoven’s De Nederlandse Hooiwagens (Opiliones) that they made an English translation, which can be downloaded for free here. This translation is intended to act as a supplement to the Dutch publication, to which reference should be made for photographs and figures. Page numbering is specific to the English version. To speed access to species descriptions, these are included in the index pages 3 & 4 (see page 117 in the Dutch Version).