Pseudosympycnus singularis (Parent)

Soares, Matheus M. M. & Capellari, Renato S., 2020, Review of the Neotropical genus Pseudosympycnus (Diptera: Dolichopodidae) with description of six new species from Brazil and Peru, Zootaxa 4881 (2), pp. 231-256 : 251-252

Pseudosympycnus singularis (Parent)

( Figs 11 , 64, 65 , 86 )

Sympycnus singularis Parent, 1934: 259 , figs 6–9 (pl. 67). Type locality: Gorgona Island , Colombia .

Diagnosis (male). Metepimeron yellow ( Fig. 11 ). Femur I brown, II and III yellow ( Fig. 11 ). Tibia I not compressed. Tarsus I ( Fig. 64 ) brown: It 1 with anterior row of erect short setae; It 2 with brush of compacted stout dorsal setae directed forward at, apex with dorsal and anterodorsal stout setae; It 3 subtriangular, projecting dorsally over base of It 4 and with dorsal row of setae; It 4 twice the length of It 5 and cylindrical. Tarsus II: IIt 1 with anterodorsal row of 5–6 short setae at base. Tarsus III ( Fig. 65 ): IIIt 3 with row of posterior long setae curved at apex, as long as the podomere length, IIIt 4 with posterior row of long and slender setae.

Additional material (all specimens in MTEC, J. Runyon, pers. comm.). Belize: Stann Creek Distr. Mayflower Bocawina NP, Bocawina Falls , 120 m, 16º55.363′N 88º24.131′W, 07.x.2018, J.B. Runyon (15 Ƌ, 4 ♀) ; same data except, Antelope Falls , 275 m 16º56.290′N 88º23.688′W, 22.iv.2015 (3 Ƌ, 3 ♀) ; Stann Creek Distr, Cockscomb Basin, Tiger Fern Falls 175 m, 16º46.832′N 88º26.474′W, 16.iii.2019, J.B. Runyon (1m #, 2 ♀,) ; same data except, small creek, 80 m, 16º46.939′N 88º27.220′W, 09.x.2018 (14 Ƌ, 6 ♀) .

Distribution. Belize and Colombia (Gorgona Island) ( Fig. 86 ).

Remarks. This species can be recognized by leg I brown and It 4 cylindrical, twice longer than It 5. According to the original description ( Parent 1934) and photographs of the type specimen (NHMUK), the male tibia I is compressed, but in a series of 33 males from Belize, two of them have had their tibiae I collapsed during drying (J. Runyon, pers. comm.). We assumed that a similar artificial compression happened to Parent’s specimen and treat this species as having an unmodified tibia I.

The following notes on the females were provided by J. Runyon (pers. comm.) and complements Parent’s original description: “ Female. Similar to male, except for MSSC and following features: Face 3x as wide as in male, but still quite narrow (slightly narrower than ocellar tubercle). Palpus slightly enlarged, 1.5 times longer than wide, 1/5 as long as head height, densely covered with silvery pruinosity (this is not like in the male, but typical pruinosity), clothed with about 10 small black setae, apical seta largest. Legs yellow except coxa II brown, and tarsi becoming brown from apex of tarsomere I. ”

Figures

FIGURE 86. Known geographic distribution of species of Pseudosympycnus Robinson.

FIGURES 7–11. Pseudosympycnus Robinson. Habitus. 7. P. palpiger (Van Duzee, 1931), paratype Ƌ; 8. P. perornatus Robinson, 1967, paratype Ƌ; 9. P. robinsoni sp. nov., holotype Ƌ; 10. P. sehnali sp. nov., holotype Ƌ; 11. P. singularis (Parent, 1934), syntype Ƌ (photo: Erica McAlister). Scale bars = 1 mm.

FIGURES 55–65. Pseudosympycnus Robinson. Male tarsus I and III. 55–57 P. palpiger (Van Duzee, 1931). 55, 57. Paratype Ƌ. 55. Tarsus I. 57. Tarsus III. 56. Identified specimen from Acre, Brazil, tarsus I. 58–59. P. perornatus Robinson, 1967, paratype Ƌ. 58. Tarsus I. 59. Tarsus III; 60–61. P. robinsoni sp. nov., holotype Ƌ. 60. Tarsus I. 61. Tarsus III; 62–63. P. sehnali sp. nov., holotype Ƌ. 62. Tarsus I. 63. Tarsus III; 64–65. P. singularis (Parent, 1934), syntype Ƌ (photo: Erica McAlister). 64. Tarsus I. 65. Tarsus III. Scale bars = 0.2 mm.