Unraveling Ocyptamus and the Baccha legacy (Diptera: Syrphidae): redefinition of groups and new species descriptions Author Mengual, Ximo Author Miranda, Gil Felipe G. Author Thompson, F. Christian text Zootaxa 2018 2018-08-20 4461 1 1 44 journal article 28997 10.11646/zootaxa.4461.1.1 9c7f14b6-7cfb-4305-88b1-8ce90d4b21e7 1175-5326 1459796 C0F0C0EF-D22C-47ED-9400-F50A8E122DD0 Genus Styxia Hull, 1943 stat. rev. Figs 52–54 . Styxia Hull, 1943b : 46 , as a subgenus of Baccha . Type species: Styxia eblis Hull, 1943b (original designation). Ocyptamus ( Styxia ) . Mengual et al . (2012) . Ocyptamus eblis species group. Miranda et al . (2016) . Diagnosis. Wide face (half the width of the head). Eyes usually pilose. Frons swollen and antennal pits separated. Ventral lobe of calypter black. Wing dark with hyaline, bare quadrangular areas. Abdomen spatulate. Abdominal terga with half of basolateral margins pale. Comments. Although the most distinct and unique feature of Styxia are the pilose eyes, GFGM is aware of undescribed species that are very similar to S. eblis but have completely bare eyes. The original taxonomic status of this name is confusing. In the original key and description (Hull 19 43b: 45– 46) the name is referred to “n. subgen.” but the type species is described as “ Styxia eblis ” ( Hull 1943b: 65 ) . Following the International Code of Zoological Nomenclature (1999) , Article 23.6, “ the first nomenclatural act taken in respect of a name or a nominal taxon ... constitutes the only valid such act ”. Thus, Styxia was originally proposed as a subgenus of Baccha and its relative priority is equal to the other subgenera proposed by Hull in that article ( Hull 1943b ). Species list (3): S. ariela ( Hull, 1944c ) , S. cerberus ( Hull, 1943b ) , S. eblis ( Hull, 1943b ) .