Table 2. Taxon counts for all 18 in How many mammal species are there now? Updates and trends in taxonomic, nomenclatural, and geographic knowledge

Table 2. Taxon counts for all 18 versions of the MDD from the initial release of MDD1 in 2018 to the present release of MDD2. TaxaMDD1.0MDD1.2MDD1.3MDD1.6MDD1.7FebruaryMDD1.1SeptemberDecemberMDD1.3.1MDD1.4MDD1.5AugustNovember2018March 201920202020January 2021April 2021June 202120212021Species6,4956,5276,4856,5136,5136,5336,5546,5576,567Wild extant6,3826,4106,3636,3916,3916,4116,4326,4356,447Recently extinct96100103103103103103103101Domestic171719191919191919Diff: de novoN A+22+98+140+13+11+5+13Diff: SplitN A+33+154+150+18+10+3+6Diff: LumpN A−31−285a−40−100−5−8Genera1,3161,3231,3311,3301,3301,3321,3351,3411,343Families166168167167167167167167167TaxaMDD1.8MDD1.10MDD1.12MDD1.12.1MDD2.0FebruaryMDD1.9MDD1.9.1DecemberMDD1.11JanuaryJanuaryMDD1.13August2022April 2022June 20222022April 202320242024July 20242024Species6,5916,5966,5966,6156,6496,7186,7186,7536759Wild extant6,4716,4766,4766,4946,5266,5946,5946,6236629Recently extinct101101101101105107107113113Domestic191919201817171717Diff: de novo+21+80+22+15+370+24+2 (296)bDiff: Split+6+70+26+49+360+25+4 (321)bDiff: Lump−3−100−30−29−80−120 (357)bGenera1,3421,3421,3421,3471,3451,3511,3511,3531353Families167167167167167167167167167 Species-level differences (“diffs”) between versions are noted with the terms “de novo” (additions that coined a new species epithet), “split” (additions that applied an existing species epithet to a newly recognized taxon), and “lump” (removals that combined 2 or more existing species-rank taxa). Totals of split species do not include names erroneously excluded from earlier versions, and total lumped species do not include names removed due to being considered nomina dubia or unavailable. See Supplementary Data SD4 for all MDD version “diff” files and Supplementary Data SD5 for the “diff” file between MDD1 and MDD2 specifically. aMost of the ungulate revisions from Groves and Grubb (2011) were removed except when corroborated by later publications. bTotal differences between MDD1 and MDD2 in parentheses.