Tetraneuromyia errata, Jaschhof & Jaschhof, 2019

Jaschhof, Mathias & Jaschhof, Catrin, 2019, New Dicerurini from Europe, mostly Sweden (Diptera: Cecidomyiidae, Porricondylinae), Zootaxa 4559 (2), pp. 245-264 : 255

Tetraneuromyia Mamaev, 1964

This Palearctic genus of previously nine species ( Jaschhof & Jaschhof 2013, 2015) is enlarged here by four new species from Sweden and Slovakia. Three of the new species are true novelties, whereas the fourth results from splitting T. lamellata Spungis, 1987 sensu Jaschhof & Jaschhof (2013) into two discrete species. Furthermore, the male of T. bulbifera Mamaev, 1964 is redescribed based on specimens from Sweden, thereby completing our revision of Tetraneuromyia species begun earlier ( Jaschhof & Jaschhof 2013: 155ff.). Tetraneuromyia varimezovi from Bulgaria, a species of which we have not seen specimens, seems to resemble T. lenticularis ( Spungis, 1987) , if the male genitalic sketch provided by the describing authors ( Mamaev & Dimitrova 1998: fig. A) is correct. The genus Tetraneuromyia is characterized by the tegmen whose basic structure is a central trunk of inverted T-shape, which extends into long, bent apodemes basolaterally and one or two pairs of processes apically (see, for example, Fig. 23 ). Size, outline and orientation of the tegminal processes have merit for the identification of species ( Jaschhof & Jaschhof 2013, 2015, this paper). The only exceptions from this pattern are T. lamellata and T. errata sp. nov., two similar-looking species, whose tegmina lack processes, but have fringes of small barbs ( Figs 26–28 ).

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.

FIGURES 25–31. Tetraneuromyia lamellata, males, from Sweden. 25: Genitalia, ventral. 26: Tegmen, ventral. 27: Tegmen, ventral. 29: Gonostylus, ventral. Tetraneuromyia errata, males. 28: Tegmen, ventral, holotype. 30: Gonostylus, ventral, specimen from Skåne. 31: Genitalia, ventral, holotype. Scales for 25–27, 29–31, 0.05 mm, for 28, 0.025 mm. Arrows refer to characters described in the diagnosis.