A determination key for modern dinoflagellate cysts

Abstract

The first online modern organic-walled dinoflagellate cyst determination key has been launched at www.marum.de/ dinocystkey.html. This key is based on easily recognisable morphological features of dinoflagellate cysts that can be observed using standard transmitted light microscopy. To date, the key includes 96 cyst species that can be found in late Quaternary marine sediments. This key is free of charge to users, and will be continuously updated and improved by the authors. For each individual species of dinoflagellate cyst, the website provides information on its defining morphological characteristics and the cystÀmotile stage relationship. It gives a comparison with other morphologically similar taxa, links to publications with original cyst descriptions and outlines their modern global distribution where this information is available. All species descriptions are illustrated by line drawings showing their most distinctive characteristics, and accompanied by high-quality bright-field photomicrographs. The key is compatible with all major computing platforms (including smartphones) and software.

Physico-chemical and biological factors influencing dinoflagellate cyst production in the Cariaco Basin

“…The dinoflagellate cyst nomenclature follows the paleontological taxonomy system provided in Lentin and Williams (1993) (recently updated in Williams et al, 2017) and conforms to taxonomic descriptions provided by Margalef (1961), Wall and 15 Dale (1966, 1968, 1969, Reid (1977), Matsuoka et al (1990, 2006), Zonneveld (1997, Ellegaard and Moestrup (1999), Head (1996Head ( , 2002, Rochon et al (1999), Zonneveld and Jurkschat (1999), Verleye et al (2011), Mertens et al (2013) and Liu et al (2015), with most cyst description summaries and corresponding motile dinoflagellate names provided in Zonneveld and Pospelova (2015).…”

“…List of dinoflagellate cyst taxa identified in the Cariaco sediment trap time series, and their motile equivalents (e.g., Zonneveld and Pospelova, 2015 …”

Islandinium minutum subsp. barbatum subsp. nov. (Dinoflagellata), a New Organic‐Walled Dinoflagellate Cyst from the Western Arctic: Morphology, Phylogenetic Position Based on SSU rDNA and LSU rDNA, and Distribution

“…; and as the nomen nudum “ Polykrikos quadratus ” in Bonnet et al. ; Zonneveld and Pospelova ) were encountered in surface sediment from the Western Arctic. These species/morphotypes were sequenced.…”

“…Species belonging to the clades and subclades recognized within the Protoperidiniaceae by Matsuoka and Kawami (2013) are grouped using boxes and dashed vertical lines, respectively. nomen nudum "Polykrikos quadratus" in Bonnet et al 2012;Zonneveld and Pospelova 2015) were encountered in surface sediment from the Western Arctic. These species/ morphotypes were sequenced.…”

“…cezare, and propose it as a new subspecies of I. minutum. The distribution of this subspecies in surface sediments from the Western Arctic is determined, and the phylogenetic positions of other cysts encountered during the study, including E. karaense and "Polykrikos quadratus" (nomen nudum in Bonnet et al 2012;Zonneveld and Pospelova 2015), are discussed.…”