Frutillaria triangularis Richards

Kits, Joel H. & Marshall, Stephen A., 2011, A revision of Frutillaria Richards and Penola Richards (Diptera: Sphaeroceridae: Archiborborinae), Zootaxa 2863, pp. 1-34 : 25

publication ID	https://doi.org/ 10.5281/zenodo.203208
DOI	https://doi.org/10.5281/zenodo.6191629
persistent identifier	https://treatment.plazi.org/id/5562879B-FFCA-FFC8-EAA4-FD35B1C3F8DE
treatment provided by	Plazi
scientific name	Frutillaria triangularis Richards
status

Treatment

Frutillaria triangularis Richards View in CoL

( Figs. 53–55 View FIGURES 53 – 58 , 95, 96, 101 View FIGURES 95 – 103 , 108 View FIGURES 108 – 115 )

Frutillaria triangularis Richards, 1964: 44 View in CoL

Description. Length 1.7–2.7 mm (head + thorax 0.7–1.3 mm).

Head dark to reddish brown, anterior part of frons orange, frons entirely covered with microtomentum. Scape and first flagellomere orange, pedicel brown. Clypeus mostly brown, prementum orange-brown.

Thorax black with some reddish areas, particularly postalar callus and scutellum. Wing rudiment brown. Mesoscutum and scutellum entirely covered with microtomentum. Anepisternum mostly covered in microtomentum, with a shiny bare patch medially on ventral 1/3. Katepisternum with two shiny bare patches, one immediately behind coxa and another slightly posterior, the two patches sometimes merged. Meron with a narrow shiny band immediately behind katepisternum, metapleuron entirely covered with microtomentum, laterotergite with a small shiny spot ventrally.

Legs black; joints, trochanters, and tarsi orange, fore coxa reddish brown. Mid femur with 3 (rarely 4–5) anterior bristles.

Male abdomen ( Figs. 53–55 View FIGURES 53 – 58 ): Tergites 1–5 and sternites 2–5 covered in microtomentum, hind margin narrowly shiny. Surstylus triangular apically. Postgonites with sinuate margins, bilobed at tip, both lobes fairly short and blunt. Epiphallus not clearly separated from basiphallus. No ring-shaped sclerite present. Distiphallus in side view with 4 areas of sclerotization surrounding a clear central area. Dorsal sclerite with a pair of lateral ridges and a medial dorsal ridge. Lateral arms not developed. Ventral sacs present, clear.

Female abdomen ( Figs. 95, 96, 101 View FIGURES 95 – 103 ): Tergite 1–5 and sternites 2–5 covered in microtomentum, hind margin narrowly shiny. Tergite 6 and sternite 6 shiny anteriorly, with microtomentum posteriorly. Tergites 7–8 and sternite 7 mostly shiny. Tergite 8 complete; epiproct parallel-sided with short, broad anterior arms. Cerci covered with microtomentum apically. Sternite 8 with rounded sclerites, hypoproct not sclerotized. Spermathecae with short basal and apical mushroom-shaped invaginations, basal annulated, apical smooth.

Type material. Holotype 3: CHILE: [Biobío:] Concepción, Oca de Bio-Bio, about 37ºS, 24 May 1957, [G. Kuschel] ( BMNH, apparently lost).

Material examined. CHILE: Biobío: San Pedro de La Paz, ~ 6km S, Pinus sp. forest, 360 m, 12 Dec 1982 – 2 Jan 1983, A. Newton and M. Thayer (115 3, 95 Ƥ, DEBU, FMNH).

Comments. Although the type specimen is lost, the unique shape of the surstylus and Richards' (1964) illustration of the male terminalia enable recognition of this distinctive species. The type locality, recorded as “Oca de Bio-Bio” by Richards, may refer to the mouth (= boca) of the Biobío River, which is just to the north of Newton and Thayer’s collection site.