Permixtolimosina, Papp, László, 2014

Papp, László, 2014, New genera of Afrotropical limosinine sphaerocerids (Diptera: Sphaeroceridae), Zootaxa 3764 (2), pp. 101-130 : 119-121

Permixtolimosina gen. nov.

( Figs 75–87 )

Type species: Permixtolimosina sexsetosa sp. nov., by present designation.

Gender: feminine.

Etymology. The name of the new genus is composed from the Latin ‘permixtus’ (= strongly mixed) and the genus name Limosina (the former large genus of Limosininae ).

Diagnosis. The scutellum of the new genus is with an additional (basal) pair of marginal setae. Its vein R4+5 is strongly upcurved and surstylus is long and slender. The other important features in the male genitalia: sternite 5 is large with a pair of broad medio-caudal processes, the subepandrial sclerite of Permixtolimosina is extremely large; its small asymmetrical hypandrium and the robust postgonite are stressed here. This new genus runs to couplet 45 in Papp’s (2008) key. If couplet 47 has been reached, we can get to couplets 55 and 56. Its vein R4+5 is strongly upcurved and surstylus is long and slender, its scutellum with an additional pair of marginal setae. So we can reach the genus Chespiritos Marshall, 2000 smoothly. Contrary to Chespiritos , female epiproct well-developed with a longer pair of setae, cercal setae are extremely long and spermathecae tyre-shaped with a conical basal part instead of the globular spermathecae of Chespiritos .

Description. Head. 6 (5) pairs of short widely distant pairs of interfrontal setae. Head setae comparatively short. Gena with a ventral, more microtomentose spot from vibrissa to caudal 1/4 of gena (posteriorly occupies half of genal height). Preocular and subocular setulae extremely long. First flagellomere with blunt dorsal apex. Arista with long (0.015 mm) cilia.

Thorax. Mesonotum sub-shiny with a prescutellar pair of dorsocentral setae. Acrostichal microchaetae sparse but rather long, prescutellar pair 0.08–0.09 mm long. Scutellum with a 3rd pair of basal scutellar setae of 0.08 mm. Anterior katepisternal seta (c. 0.10 mm) almost as long as posterior pair.

Legs. Mid trochanteral seta short. Mid tibia with a distinct mid ventral seta. Anterior apical seta on mid tibia rather strong.

Wing with long perpendicular setae on humeral crossvein and 3–4 perpendicular setae on first costal section. Costal vein overruns apex of R4+5 on a long section.

Abdomen comparatively narrow and long.

Male. Sternite 5 large ( Fig. 75 ) with a pair of broad caudal processes similar to those of Biphallapodema and some species of Opalimosina , but setae are sparse, with 2 pairs of long (0.07–0.08 mm) setae only. Processes with pegs very close to each other, in contrast to Biphallapodema . Synsternite ( Fig. 77 ) in shape very unlike that of Biphallapodema : sternite 8 part not broad, sternite 7 and sternite 8 parts completely fused. Epandrium length dorsally not greater than 0.025 mm and sparsely setose but with a large ventral, ventrally directed pair of setae (0.12 mm). Its cercal part simple but the two sides are broadly fused ( Fig. 79 ). Hypandrium ( Fig. 78 ) very short but very broad: a small triangular medial part, which is completely fused to the long curved arms. Hypandrial connecting sclerite to the dorsal part of phallus thin, long and black ( Fig. 78 ). Subepandrial sclerite (better seen in anterior i.e. inner view) large, evenly sclerotised and melanised ( Fig. 79 ). Surstylus ( Figs 80–81 ) extremely thin and long (broadest view is ventral-subventral!), not directly connected to epandrium but through membranes. Basiphallus ( Fig. 82 ) comparatively short and small, with a proclinate (!) epiphallus. Distiphallus ( Fig. 82 ) also small with a pair of basally directed sub-basal processes, a pair of blunt dorsally directed lateral processes, a Ushaped thin black apical sclerite and a broad ventral sclerite, whose apical part curves dorsally. Phallapodeme ( Fig. 82 ) very long, 0.27 mm, while phallus only 0.07 mm long. Postgonite ( Fig. 82 ) 0.11 mm long, dorso-basal part medially curved to join basal part of distiphallus; apex blunt.

Female. Abdominal tergite 1+2 comparatively large, occupies almost 1/3 of abdominal length, medial parts completely but weaker and lighter sclerotised than lateral parts. Preabdominal tergites weakly sclerotised and small, consequently membranes between tergites and sternites large with short setulae, which emerge from small round (c. 0.05 mm) sclerites; c. 30 such sclerites between tergite 5 and sternite 5 on both sides. Tergite 8 ( Fig. 83 ) comparatively large with a deep cranial (anterior) emargination and medial part less sclerotised but tergite 8 not divided. Sternite 8 small shield shaped with some asymmetrically placed short caudal setae, (actually composed of a small ventral and an even smaller rather membranous dorsal sclerite, faintly portrayed on Fig. 85 ). Epiproct ( Figs 83, 85 ) small pentagonal with a pair of setae, which emerge extremely anteriorly. Hypoproct ( Figs 84–85 ) larger with a pair of 0.05–0.055 mm long sub-ventrally directed setae. Cercus ( Fig. 83 ) small, only 0.05 mm long with a pair of 0.13 mm long apical, a 0.11 mm long subapical-subdorsal and a pair of shorter subapical-sublateral setae plus one pair of thinner 0.05 mm long ventrally directed setae. Spectacles-shaped sclerite ( Fig. 86 ) peculiar. Spermathecae ( Fig. 87 ) extremely large; unpaired one larger than paired ones (its diameter is 0.10 mm vs. 0.06 mm). Ducts short, common sclerotised duct of the paired spermathecae extremely short.

Figures

FIGURES 75 – 82. Permixtolimosina sexsetosa sp. n., male postabdomen and genitalia. 75 = sternite 5, in a view perpendicular to the plane of process, i. e. body of the sternite seems to be shortened, 76 = medio-caudal part of sternite 5 in higher magnification, 77 = synsternite, ventral view, 78 = hypandrium, ventral view (processes to postgonites are black), 79 = subepandrial sclerite with contours of epandrium, inner (anterior) view, 80 = surstylus, ventral view, 81 = surstylus, lateral (= broadest) view, 82 = phallus, postgonite and phallapodeme, left lateral view. (BPh: basiphallus, bD: basal part of distiphallus, dD: distal part of distiphallus). Scale bars: Figs 75, 77 – 78 = 0.2 mm, Figs 76, 79 – 82 = 0.1 mm.

FIGURES 83 – 87. Permixtolimosina sexsetosa sp. n., female postabdomen and genitalia. 83 = tergite 8, epiproct and cerci with contours of hypoproct, subdorsal view, epiproct is slightly oblique in this view, 84 = sternite 8 and hypoproct, ventral view, 85 = female terminalia, lateral view, 86 = spectacles-shaped sclerite, ventral view, 87 = spermathecae. (ep: epiproct, hy: hypoproct, sps: spectacles-shaped sclerite, S 8: sternite 8, T 8: tergite). Scale bars: Fig. 85 = 0.2 mm, Figs 83 – 84, 86 – 87 = 0.1 mm.