Maiana Miranda, 2020

Miranda, Gil Felipe Gonçalves, Skevington, Jeffrey H. & Marshall, Stephen A., 2020, New generic concepts for orphaned lineages formerly treated as part of the genus Ocyptamus Macquart, 1834 (Diptera, Syrphidae), Zootaxa 4822 (2), pp. 151-174 : 156-157

Genus Maiana Miranda gen. nov.

Figs 16–22 , 67–69 , 102

urn:lsid:zoobank.org:act:653D9422-ABC8-48E6-BC3B-712EA966E548

Type species: Baccha pumila Austen, 1893

Baccha lepidus species group, in part. Hull (1949a)

Ocyptamus callidus species group. Miranda et al. (2016); Mengual et al. (2018)

Description. Head. Face pale and narrow (between 1/4 and 1/3 of head width); tubercle weak and medially positioned. Antennal insertions confluent. Frons ~1/3 of head width. *Male ocellar triangle ~3 times its length from posterior eye margin ( Fig. 17 ). Female ocellar triangle ~1 ocellus-width from lateral eye margin. Dorsal occiput with 2 rows of pile. Thorax. Scutum with 3 golden microtrichose stripes, and without distinct anterior row of pile. Scutellum pale. Anterior anepisternum pilose. Katatergite with short microtrichia that gives the sclerite a ‘velvet’ appearance. Metaepisternum pilose. Metasternum bare. Upper calypter margin with pile shorter than pile on the ventral calypter margin. Metafemur with normal pile. Wing. Alula narrow (as wide as c cell). Wing hyaline. Abdomen. Abdomen slightly petiolate; terga with ‘L’-shaped pale markings ( Fig. 16 ); *tergum 1 trapezoidal and short ( Figs 19 and 67 ); 2nd abdominal segment slightly constricted; *male sternum 4 and, more so, 5 asymmetrical ( Fig. 68 ). Terminalia. Female tergum 7 as a pair of lateral rectangular sclerotized areas ( Fig. 102 ); tergum 8 boomerangshaped with weakly sclerotized sides ( Fig. 102 ). Male hypopygium very large; *subepandrial sclerite very large, with ventro-lateral, wide, lobular expansions directed apically ( Figs 20 and 21 ); *hypandrium pilose on apico-ventral lobes ( Fig. 22 ); *postgonite rudimentary ( Fig. 22 ); *phallus heavily sclerotized and cone-shaped ( Figs 22 and 69 ).

Included species (2): M. callida ( Hine, 1914) comb. nov. [1b, 3, 4], M. pumila ( Austen, 1893) comb. nov. [1b].

Etymology. The genus is named after the first author’s youngest daughter. The name is to be treated as feminine.

Comments. This genus, corresponding to the former Ocyptamus callidus species group, is superficially similar to Nuntianus gen. nov., from which it differs in having three golden microtrichose stripes on the scutum ( Fig. 16 ), slight constriction in the 2 nd abdominal segment ( Fig. 16 ), a pair of ‘L’-shaped pale markings on the abdominal terga ( Fig. 16 ) and enlarged male hypopygium ( Figs 20, 21, 22 ).

The wide expansions of the sub-epandrial sclerite in Maiana gen. nov. are similar to the F. rugosifrons species group. The anterior lobular projection of these expansions ( Fig. 20 ) resembles the lobate condition in Nuntianus gen. nov. (see below), although they are lateral instead of medial ( Figs 20, 21 ). Molecular data do not support an association of Maiana with either of these groups, but instead suggest a relationship to Styxia Hull, 1943a ( Miranda et al. 2016).

Figures

FIGURES 12–22. 12–15. Hypocritanus Miranda gen. nov.. 12: Hypocritanus fascipennis (Wiedemann), female, habitus, dorsal view, by Steve Marshall. 13: Hypocritanus fascipennis (Wiedemann) (debu01088980), male, epandrium, ventral view. 14–15. Hypocritanus fascipennis (Wiedemann) (debu00119165), female, terminalia. 14: dorsal view. 15: lateral view. 16–22. Maiana Miranda gen. nov. 16: Maiana pumila (Austen), female, habitus, dorsal view, by Steve Marshall. 17: Maiana sp. (INPA- DIP000172), male, head, dorsal view. 18: Maiana pumila (Austen) (JSS32861), male, wing. 19: Maiana pumila (Austen) (debu00178088), female, scutellum and tergum 1, dorsal view. 20–22. Maiana pumila (Austen) (JSS32861), male, terminalia. 20: epandrium, lateral view. 21: epandrium, ventral view. 22: hypandrium, lateral view. c: cercus; e: epiproct; h: hypandrium; p: postgonite; ph: phallus; s: surstylus; se: subepandrial sclerite; l: lobe; le: lobular expansion; lem: lateral eye margin; o: ocellar triangle; pem: posterior eye margin; t1: tergum 1.

FIGURES 61–67. 61: Pseudoscaeva diversifasciata (Knab) (CNC_Diptera040088), female, katatergite, lateral. 62: Styxia eblis Hull (debu01088838), male, pleuron, lateral. 63: Hybobathus norina (Curran) (JSS25233), male, hypandrium, lateral. 64: Orphnabaccha aff. calda (CNC_Diptera210099), male, hypandrium, lateral. 65: Mimocalla erebus (Hull) (CNC_Diptera209355), male, epandrium, lateral, photo previously published in Mengual et al. (2018). 66: Fragosa argentina (Curran) (CNC_Diptera174232), female, tergum 1, dorsal. 67: Maiana callida (Hine) (CNC_Diptera105396), male, tergum 1, dorsal. c: cercus; ca: calypter; d: distiphallus; db: dorsal bridge; e: epandrium; h: hypandrium; k: katatergite; l: lobe; n: lateral notch; p: postgonite; ps: posterior spiracle; s: surstylus; t1: tergum 1.

FIGURES 68–77. 68: Maiana callida (Hine) (CNC_Diptera105396), male, abdomen, ventral. 69: Maiana pumila (Austen) (JSS32861), male, terminalia, oblique fronto-ventral. 70–73: Hybobathus pola (Curran). 70: female terminalia (CNC_Diptera 161361), apex, dorsal. 71–72: male terminalia (CNC_Diptera 161366). 71: hypandrium, ventral. 72: terminalia, lateral. 73: holotype Baccha pola Curran (AMNH), male, habitus, dorsal, by AMNH. 74: Fragosa aurora (Hull) (holotype Baccha aurora Hull, AMNH), male, habitus, dorsal, by AMNH. 75: Nuntianus variegatus (Macquart) (holotype Baccha variegata Macquart, MNHNP, ED8265), female, habitus, dorsal, by MNHNP. 76: Fragosa virgilio (Hull) (holotype Baccha virgilio Hull, CNC, CNC_Diptera189124), male, habitus, dorsal, by CNC. 77: Victoriana oblonga (Walker) (holotype Baccha oblonga Walker, BMNH, NHMUK 010369937), female, habitus, dorsal, copyright of The Trustees of the Natural History Museum, London. c: cercus; e: epiproct; h: hypandrium; l: lobe; n: lateral notch; p: postgonite; ph: phallus; s: surstylus; s4 and 5: sternum 4 and 5; t7: tergum 7.

FIGURES 89–102. 89: Victoriana sativa (Curran) (holotype Baccha sativa Curran, AMNH), habitus, dorsal, by AMNH. 90– 91: Victoriana laudabilis (Williston) (holotype Baccha laudabilis Williston, BMNH, NHMUK010369870), copyright of The Trustees of the Natural History Museum, London. 90: base of abdomen and metafemur, dorsal. 91: base of wing, dorsal (line drawing represents outline of the alula). 92–95: Fragosa sp. (species group tenuis, CNC_Diptera196012), male. 92: hypandrium, lateral. 93: surstylus, ventro-lateral. 94: epandrium, lateral. 95: epandrium, ventral (line drawing represents outline of the subepandrial sclerite). 96–97: Nuntianus abata (Curran) (CNC_Diptera209361), male, hypandrium. 96: lateral. 97: ventral. 98: Syrphus conjunctus Wiedemann (currently incertae sedis, CNC_Diptera209347), male, hypandrium, lateral. 99: Victoriana aff. melanorrhina (debu00279441), male, hypandrium, ventral. 100: Victoriana aff. melanorrhina (DEBU), female, terminalia, dorsal. 101: Victoriana parvicornis (Loew) (CNC_Diptera237922), terminalia, dorsal. 102: Maiana pumila (Austen) (debu00178088), female, terminalia, dorsal. a: alula; c: cercus; d: distiphallus; e: epiproct; l: lobe; p: baso-posterior pile; t7 and 8: tergum 7 and 8.