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Merodon   natans    group (  Diptera  ,   Syrphidae  ) taxa are reviewed using an integrative taxonomic approach combining morphological, morphometric and molecular techniques. The approach substantiates recognition of the three species:    M.   calcaratus    (Fabricius, 1794),    M.   natans    (Fabricius, 1794) and    M.   pulveris    Vujić &amp; Radenković in  Radenković et al. 2011 , and reveals the existence of a new species,    M.   makrisi    Vujić, Radenković &amp; Tot  sp. nov. , which is described. It also highlights the existence of a series ofnatans    group populations, especially on some of the Mediterranean islands, in the Levant and in the Afrotropical Region, for which more comprehensive data are required to clarify their status. A key is provided to thenatans    lineage species currently recognised, and preimaginal stages of somenatans   -group species are described for the first time. Redescriptions for    M.   calcaratus    and    M.   natans    are provided. A neotype is selected for    M.   natans   . Lectotypes are designated for    M.   annulatus    (Fabricius, 1794) and    M.   melancholicus    (Fabricius, 1794).    Merodon   annulatus    is recognised as a synonym of    M.   natans   .

arthropod systematics andamp; phylogeny

Review of the    Merodon   natans    group with description of a new species, a key to the adults of known species of the      natans    lineage and first descriptions of some preimaginal stages