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1. Introduction The Silurian (Pridoli) and Devonian marine succession of southern Belgium and northern France (Fig. 1) is particularly rich in invertebrates and notably in brachiopods (northern France means herein the area comprised between Mondrepuis (Aisne), to the west and Givet (Ardennes), to the east). This geographically restricted area is famous worldwide as several internationally recognized Devonian stages were firstly defined there such as the Givetian and the Famennian. During the interval ranging from 1870 to 1945, numerous new brachiopod species and varieties were erected on the basis of material from this area especially by E. Asselberghs (1889–1959) and E. Maillieux (1875–1946); the type material of most of them is now curated at the Royal Belgian Institute of Natural Sciences (Brussels). Whereas international palaeontological databases are built for assessing the evolution of the biodiversity through time, many of these brachiopod species and ‘varieties’ described in the course of the second half of the 19th century and the first half of the 20th century have never been revised so far; they are still only known by embellished drawings or poor-quality photographs. The aim of this paper is to contribute to the assessment of the brachiopod diversity during the considered stratigraphic timespan in promoting and facilitating future taxonomic studies. For this reason, the type material of almost each species deposited at Brussels is illustrated photographically (so

geologica belgica (printed)/geologica belgica (online)

An annotated catalogue of types of Silurian–Devonian brachiopod species from southern Belgium and northern France in the Royal Belgian Institute of Natural Sciences (1870–1945), with notes on those curated in other Belgian and foreign institutions