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on planktonic graptolites, the most common and diversified macrofossils to be found in anoxic black shales, which are widespread in off-shore depositional settings, particularly in the lower part of the Silurian System. High-resolution correlation, particularly quantitative stratigraphical correlation based upon semi-automated (Shaw’s graphic correlation: Shaw 1964, Cooper & Lindholm 1990, Fan et al. 2013) and automated systems (CONOP: Sadler et al. 2003, 2011; Sadler 2004; Cooper et al. 2014 and Horizon Annealing: Sheets et al. 2012, Melchin et al. 2016a) have demanding requirements for primary data input. Densely sampled sections with abundant and highly diversified graptolite faunas are just one step on the way to maximum resolution in stratigraphy and correlation, which also relies critically on the correct taxonomic assignment of the taxa involved. Modern taxonomic revisions are needed not only for the purpose of high-resolution stratigraphy and correlation, but also correct determination of the taxa is a primary prerequisite for any palaeobiogeographical analysis, particularly when closely similar taxa occur in a similar, but not always the same, stratigraphical interval in different palaeobiogeographical provinces. The present study focusses on the systematic revision of lower Aeronian monograptids with proximal rastritiform to sub-rastritiform thecae and non-overlapping, subrastritiform to high-triangular distal thecae with hooked apertures that are transversely extended into a pair of lateral apertural processes. These graptolites are of particular importance in lower Aeronian graptolite biostratigraphy

Lower Aeronian triangulate monograptids of the genus Demirastrites Eisel, 1912: biostratigraphy, palaeobiogeography, anagenetic changes and speciation