This short account is an invited contribution to the Zootaxa special volume 'Twenty years of Zootaxa.' Zootaxa was first published on 28 May 2001. Between this date and December 2020, 116 papers were published in Zootaxa that mention Bryozoa, comprising mostly descriptions of new species and higher taxa, but also including molecular sequencing (e.g. Fehlauer-Ale et al. 2011; Taylor et al. 2011; Franjevic et al. 2015), invasive-species research (e.g. Ryland et al. 2014; Vieira et al. 2014), checklists (e.g. Vieira et al. 2008), classification (e.g. Bock & Gordon 2013), bryozoans as associates of other organisms (e.g. Rudman 2007; Chatterjee & Dovgal 2020; Chatterjee et al. 2020), metazoan phylogeny (e.g. Giribet et al. 2013), biographies of historical figures who worked on bryozoans (e.g. Calder & Brinkmann-Voss 2011; Calder 2015) and a catalogue of the fossil invertebrate taxa described by William Gabb (including 67 bryozoan species) (Groves & Squires 2018). Of the 116 papers, 15 (13%) were open-access. The first taxonomic paper on Bryozoa did not appear until June 2005; it included only one new species, as well as redescriptions of others. In that year, 43 bryozoan species were described across all literature (Figure 1; Table 1). Subsequently, new-species descriptions in Zootaxa remained low until they increased to 12 in 2009 (c. 24% of the total for that year). The most new-species descriptions of Bryozoa in Zootaxa in any one year was 69 in 2018, representing 92% of all new-species descriptions in that year. Zootaxa captured more than 90% of all new species bryozoan descriptions in 2013 as well. The average number of new living bryozoan species published in all journals per year, 2005-2020, was 58, of which Zootaxa captured an average of 23 new species (41%) (Table 1).
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