Pseudosympycnus Robinson

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 : 232-233

publication ID 10.11646/zootaxa.4881.2.2

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Pseudosympycnus Robinson


Pseudosympycnus Robinson View in CoL View at ENA

Pseudosympycnus Robinson, 1967: 901 View in CoL .

Type-species: Sympycnus palpiger Van Duzee (1931: 177) View in CoL , by original designation.

Diagnosis. Male. Head. Face and palpus covered with silvery pruinosity, palpus often enlarged, rounded, covered with scale-like setae (MSSC) ( Figs 12–19, 21, 22, 24–31, 33, 34, 36–39 View FIGURES 12–15 View FIGURES 16–29 View FIGURES 30–39 ). Antenna brown to black; scape dorsally bare, arista-like stylus dorsal. Thorax. Acrostichals biserial; 5 conspicuous pairs of dorsocentrals (with pair of reduced dorsocentral setae anteriad, about 1/3 to 1/2 of length of first pair) ( Figs 72–73 View FIGURES 72–73 ); scutellum with one pair of setae, but sometimes also with numerous hairs on posterior margin ( Figs 72–73 View FIGURES 72–73 ). Legs. Femur II with anterior and posterior preapical setae; femur III with anterior preapical seta. Tarsus I and distal segments of tarsus III modified in shape and/or setae, noticeably It 2 (shortened, distorted and/or ornamented with modified setae (MSSC) ( Figs 40–65 View FIGURES 40–41 View FIGURES 42–54 View FIGURES 55–65 ). Abdomen. Long and slender, cylindrical, with 6 setose segments, dark brown, often with entire tergite 1 and tergites 2–3 yellow laterally. Hypopygium small, surstylus with two lobes, epandrial lobe short ( Figs 75, 76 View FIGURES 75–78 , 79–81 View FIGURES 79–81 ). Female. Similar to males (except for MSSC), except: Head. Face also pruinose and slightly narrowed at middle, palpus not enlarged, but generally covered with silvery pruinosity ( Figs 20, 23 View FIGURES 16–29 , 32, 35 View FIGURES 30–39 ).

Remarks. Males of Pseudosympycnus are easily recognized from other genera by their striking modifications on legs, and by the enlarged and rounded palpus. Females can be differentiated from Nearctic and Neotropical females of Sympycnus by the presence of two regular rows of acrostichal setae in Pseudosympycnus (0–1 rows in Sympycnus ) (J. Runyon, pers. comm.). Females of Pseudosympycnus were not confidently sorted to species at this stage, as more information is required to make these decisions.

It is noteworthy that a number of species studied here were taken on moist rocks near waterfalls. The entire type series of Pseudosympycnus bickeli sp. nov., for example, was found in this biotype, which is similar to where specimens of P. perornatus (“on wet rocks in deeply shaded ravine”, “on surface of dam” and “on rocks near stream”; Robinson 1967) and P. latitibia sp. nov. (“on stones in streams”) were collected. Also, the type locality of P. araza sp. nov. and P. maroaga sp. nov. are both close to waterfalls ( Figs 82–85 View FIGURES 82–85 ). Moreover, specimens of P. singularis were often collected close to waterfalls in Belize (J. Runyon, pers. comm.). These data may indicate habitat preferences in the genus or at least part of the known species.












Pseudosympycnus Robinson

Soares, Matheus M. M. & Capellari, Renato S. 2020


Robinson, H. 1967: 901
Van Duzee, M. C. 1931: )
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