Tetraneuromyia bulbifera Mamaev, 1964

Jaschhof, Mathias & Jaschhof, Catrin, 2019, New Dicerurini from Europe, mostly Sweden (Diptera: Cecidomyiidae, Porricondylinae), Zootaxa 4559 (2), pp. 245-264 : 256

Tetraneuromyia bulbifera Mamaev, 1964

Figs 22–24

Adults of this species have previously been found on a very few occasions in the European part of Russia and in Moldova ( Spungis 1987). In 2016 and 2017, but never before and thereafter, we collected several males of this species in Sweden, the first findings in all of northern Europe. Our material, identified as T. bulbifera on the basis of Spungis’s (1987) description, is used here to redescribe the genitalic structures in greater detail, including slight variations found in the gonostyli and tegmina of some of our specimens. The female of T. bulbifera was described by Spungis (1987); larvae remain unknown.

Diagnosis. Tetraneuromyia bulbifera differs from the other species of this genus in that the gonostylus is slightly swollen distally, thus the specific name, bulbifera ( Fig. 24 , ↓ 4). The gonostylar apex bears a small tooth, which in normal-sized specimens consists of several closely spaced spines, while forming a rather solid structure in large, robust specimens. The tegmen fits the construction as generally found in Tetraneuromyia (see above), while species-specific characters are as follows: the dorsal, spike-shaped processes are directed posteriorly ( Fig. 23 , ↓ 5); the ventral processes, which are much broader, have rounded extensions basally and pointed apices, and their bases are touching each other to form a widely open V-shape ( Fig. 23 , ↓ 6). Each of the ventral processes has a sharp point dorsosubapically, which is quite obvious in large specimens ( Fig. 22 , ↓ 7) but much smaller and easy to miss in smaller specimens ( Fig. 23 ).

Material examined. Sweden: 7 males, Lule Lappmark, Jokkmokk, Kaltisbäcken NR, herb-rich old-growth taiga near stream, various dates between 4 July and 28 August 2016, MT and aspirator, MCJ (spms nos CEC1433 – CEC 1435 in NHRS, CEC1436 – CEC 1439 in SDEI) ; 1 male, Jokkmokk, Messaure, swampy herb-rich taiga, 31 July–28 Aug. 2016, MT, MCJ (spm. no. CEC 1441 in NHRS) ; 2 males, Jokkmokk, road 97 6 km SE Vuollerim, Lagnäsån , old-growth herb-rich taiga, 30 July–31 Aug. 2016, MT, MCJ (spms nos CEC1442 – CEC 1443 in NHRS) ; 2 males, Jokkmokk, Bombmurkleskogen S Messaure, swampy herb-rich taiga, 24–25 August 2016, aspirator, MCJ (spms nos CEC1444 – CEC 1455 in SDEI) ; 1 male, Jokkmokk, Vuollerim , Älvvägen, Lövgården, backyard, 1–23 September 2017, MT , M. Karström & MCJ (spm. no. CEC 1440 in NHRS) .

Figures

FIGURES 20–24. Neurepidosis hybrida, males. 20: Genitalia, ventral, holotype. 21: Fourth flagellomere, dorsolateral, paratype. Tetraneuromyia bulbifera, males, from Sweden. 22: Apex of tegmen, dorsal. 23: Tegmen, ventral. 24: Genitalia, ventral. Scales for 20–22, 24, 0.05 mm, for 23, 0.025 mm. Arrows refer to characters described in the diagnosis.