Ocyptamus stenogaster (Williston, 1888)

Mengual, Ximo, Miranda, Gil Felipe G. & Thompson, F. Christian, 2018, Unraveling Ocyptamus and the Baccha legacy (Diptera: Syrphidae): redefinition of groups and new species descriptions, Zootaxa 4461 (1), pp. 1-44 : 12

Ocyptamus stenogaster species group

Figs 70 , 84 , 92, 94, 95, 97 .

Baccha obscuricornis species group. Hull (1949a).

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

Ocyptamus stenogaster species group. Thompson (1981), Mengual et al. (2012), Miranda et al. (2016).

Diagnosis. Facial tubercle medially positioned and pointed. Alula absent. Metathoracic epimera extended medially and dorsally to metacoxae, almost meeting. Abdomen very narrow, long and delicate (2nd abdominal segment ḵ 8 times longer than wide).

Biology. Larvae of this species group have been reported feeding on mealybugs ( Hemiptera : Pseudococcidae ) ( Löhr et al. 1990; Rojo et al. 2003; Prado et al. 2015).

Comments. Mainly Neotropical, two species in Florida ( U.S.A.). Flies with a very narrow second abdominal segment. The typical flies of this group have a pointed facial tubercle, positioned medially on the face, a rugose frons/frontal triangle, and a wholly pale scutellum. Some species deviate from these characters, having a more globose and ventrally positioned tubercle, smooth frons/frontal triangle and black scutellum, but overall agree with the group’s diagnosis to the point of the distinct extended metathoracic epimera (unique among the groups mentioned here). Nevertheless, it seems likely that there are more inclusive groupings within this taxon.

Species list (15): O. argentinus ( Curran, 1939) , O. deceptor ( Curran, 1930a) , O. filiola ( Shannon, 1927) , O. filissima ( Hull, 1943b) , O. harlequinus ( Hull, 1948) , O. hyacinthia ( Hull, 1947a) , O. macer ( Curran, 1930a) , O. mara ( Curran, 1941) , O. oenone ( Hull, 1949a) , O. provocans ( Curran, 1939) , O. rugosifrons ( Schiner, 1868) , O. stenogaster ( Williston, 1888) , O. tenuis ( Walker, 1852) , O. titania ( Hull, 1943b) , O. zephyrea ( Hull, 1947b) .

Figures

FIGURES 62–70. 62: Calostigma elnora Shannon [female, USNM], habitus, lateral view. 63: Calostigma elnora [female, INPA-DIP0000173], thorax and abdomen, dorsal view. 64: Ocyptamus zita (Curran) [female, ZFMK-DIP-00027133], head and thorax, dorsal view. 65: Ocyptamus neuralis (Curran) [female, CNC_Diptera209401], wing. 66: Ocyptamus sp., O. lepidus species group [female, INPA-DIP0000256], habitus, dorsal view. Scale = 3 mm. 67: Ocyptamus prenes (Curran) [female, INPA-DIP0000246], habitus without wings, dorsal view. Scale = 2 mm. 68: Ocyptamus obliquus (Curran) [female, INPA- DIP0000248], abdomen, dorsal view. 69: Ocyptamus zita [female, ZFMK-DIP-00027133], abdomen, dorsal view. 70: Ocyptamus sp., O. stenogaster species group [female, INPA-DIP001362], habitus, dorsal view. Scale = 2 mm.

FIGURES 78–84. 78: Hybobathus norina (Curran) [female, CNC, JSS25237], head, dorsal view. 79: Ocyptamus sp., O. lepidus species group [male, INPA-DIP0000247], head, dorsal view. 80: Pelecinobaccha alia Miranda [female paratype, USNMENT 00036075], head dorsal view. Scale = 1 mm. 81: Hybobathus norina [female, CNC, JSS25237], thorax, dorsal view. 82: Hybobathus arx (Fluke), female, habitus, dorsal view, photo previously published in Miranda (2017). 83: Hermesomyia wulpiana (Lynch Arribálzaga) [male, USNM], habitus, dorsal view. 84: Ocyptamus titania (Hull) [female, CNC], abdomen, dorsal view.

FIGURES 92–98. 92: Ocyptamus stenogaster (Williston) [female, DEBU01088839], head, frontal view. 93: Pelecinobaccha pilinigridensis Miranda [male holotype, INBIO CRI002 447101], head, frontal view, photo previously published in Miranda et al. (2014). 94: Ocyptamus argentinus (Curran) [male, CNC_Diptera196007], wing. 95: Ocyptamus stenogaster [male, DEBU01088840], epandrium, cerci and surstyli, lateral view: c: cercus; e: epandrium; s: surstylus. 96: Pelecinobaccha vesca Miranda [male, CNC Diptera 161200], epandrium, cerci and surstyli, lateral view: c: cercus; e: epandrium; s: surstylus. 97: Ocyptamus stenogaster (Williston) [female, DEBU01088839], apex abdomen, dorsal view. 98: Pelecinobaccha alicia (Curran) [female, CNC_Diptera203481], 6 th and 7 th abdominal segments female, dorsal view, photo previously published in Miranda et al. (2014). Note: Arrow indicates the basolateral apodemes of tergum 7.