Stipulosina barbistylus Yau & Marshall, 2021

Yau, Tiffany & Marshall, Stephen A., 2021, Stipulosina new genus (Diptera: Sphaeroceridae: Limosininae) from bamboo (Chusquea scandens stipules in Ecuador, Zootaxa 5072 (3), pp. 255-277 : 266

Stipulosina barbistylus Yau & Marshall n. sp.

( Figs. 9a–e , 10a–g , 11a–d )

Description: As described for S. amphibarba n. sp. except as follows:

Male abdomen: Trifid posteromedial area with small clusters of setae on each side of center piece; longer processes flanking center piece long-setose on distal half inner margin. Cercus length 0.6–0.7× surstylus length. Ventral lobe of surstylus broad and flat, densely long-setose at distal half; dorsomedial lobe small, apex with a few stout setae followed by tight rows of setae along margin. Distiphallus cylindrical with dorsolateral edges strong and corrugated; apex membranous. Postgonite stout, broad basally and tapered apically.

Female abdomen: Tergite 8 posteromedially desclerotized; medial and lateral lengths subequal. Length of epiproct 0.5× length of cercus. Spermathecae irregularly crinkled.

Etymology: The specific name refers to the dense “beard” of long distal setae on the surstylus.

Type material: Holotype (♂, QCAZ): ECUADOR: Napo: SierrAzul Reserve , 14 km W Cosanga, 2200 m, 0°40’55”S, 77°56’9”W, in bamboo stipules, 11.v.2002, S.A. Marshall debu00195526.

Paratypes: ECUADOR: Napo: Yanayacu Biological Station , 0°36’S, 77°53’W, 2000–2500 m, 25.ix–13.x.2019, T . Yau and S.A. Marshall (63♂, 55♀, QCAZ); same as previous specimens but the female and male were taken in copula (1♂, 1♂, QCAZ); ditto, ridge, ex. Chusquea scandens stipules (1♀, QCAZ); same as previous specimens but on Rhipidocladum racemiflorum (1♀, QCAZ) .

Comments: The one specimen of this species collected from Rhipidocladum racemiflorum is the only specimen of the genus known from a species of bamboo other than Chusquea scandens . That specimen was found on a stem rather than in a stipule and it is unlikely to represent a close association. The R. racemiflorum on which the specimen was found on was close to C. scandens , and no further Stipulosina specimens were found in an extensive search of nearby R. racemiflorum .

Figures

FIGURES 9a–e. Stipulosina barbistylus sp. n. male habitus. 9a, lateral; 9b, dorsal; 9c, head; 9d, wing displaying WIPs against black background; 9e, mid tibia dorsal.

FIGURES 10a–g. Stipulosina barbistylus sp. n. male abdomen. 10a, terminalia left ventrolateral; 10b, surstyli ventrolateral, with setosity of outer lobe omitted to show inner lobe structure obstructed in 10a; 10c, terminalia ventral; 10d, epandrium posterior; 10e, epandrium lateral; 10f, phallus and associated structures left ventrolateral; 10g, phallus and associated structures left dorsolateral. Note: left cercus is absent in 10a, 10c, 10d and 10e. The cercus was missing (broken off) from the lone specimen at the time of illustration (before the 2019 collection).

FIGURES 11a–d. Stipulosina barbistylus sp. n. female abdomen. 11a, terminalia dorsal; 11b, terminalia ventral; 11c, terminalia lateral; 11d, spermathecae.