Dicerura
Creators: name: Jaschhof, Mathias
name: Spungis, Voldemars
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Cecidomyiidae
Dicerura

description: Key to male Dicerura in the Palearctic region
1 Anepisternum setose.................................................................................. 2
- Anepisternum asetose................................................................................ 14
2 Apical fork of ejaculatory apodeme with parallel, closely adpressed tines (Fig. 8). Gonostylus without mediobasal lobe (Fig. 6)................................................................................................... 3
- Apical fork of ejaculatory apodeme with tines diverging, at least at the very end (Fig. 1). Gonostylus with medial or mediobasal, mostly bulging lobe marked by dense microtrichia (Figs 1, 20)...................................... 5
3 Gonostylus conspicuously broad and curved apically. Ventral gonocoxal emargination with asetose, broadly rounded lobe basally................................................................................... D. complicata
- Gonostylus narrow apically, evenly rounded to pointed (Fig. 6). Ventral gonocoxal emargination bordered by 2 pairs of processes (Fig. 6)....................................................................................... 4
4 Gonostylus broadly rounded apically (Fig. 6). Ninth tergite with small, pointed lobes posterolaterally (Fig. 7).. D. yezoensis
- Gonostylus narrowly rounded apically (Fig. 16). Ninth tergite with V-shaped incision posteromedially (Fig. 17). D. formosa
5 Apical fork of ejaculatory apodeme with tines conjoined medially by membrane leaving just the tips separate (Fig. 19)................................................................................................. D. furculata
- Tines of apical fork of ejaculatory apodeme not conjoined by membrane (Fig. 5).................................. 6
6 Gonocoxites conspicuously densely setose ventrally, ventral emargination bordered by a single pair of processes......... 7
- Gonocoxites with ventral setae sparse or normally dense, ventral emargination bordered by 2 pairs of processes (Fig. 1)... 8
7 Apical fork of ejaculatory apodeme provided with tiny spines and merged with tegmen.................... D. peterssoni
- Apical fork of ejaculatory apodeme smooth and separate from tegmen.................................. D. fungicola
8 Ventroposterior margin of gonocoxites broadly, darkly pigmented.............................................. 9
- Ventroposterior margin of gonocoxites not darkly pigmented................................................. 10
9 Apical fork of ejaculatory apodeme serrate on medial edges (Fig. 27). Tegmen pointed apically (Fig. 27)........ D. stipator
- Apical fork of ejaculatory apodeme not serrate (Fig. 1). Tegmen broadly rounded apically (Fig. 1)............ D. jakovlevi
10 Tines of apical fork of ejaculatory apodeme with frayed ends (Fig. 24). Medial lobe of gonostylus longer than half the gonostylar length (Fig. 22)............................................................................... D. iridis
- Tines of apical fork of ejaculatory apodeme not frayed. Mediobasal lobe of gonostylus clearly shorter than half the gonostylar length............................................................................................. 11
11 Apical fork of ejaculatory apodeme about one third the apodeme’s total length, tines conspicuously slender............ 12
- Apical fork of ejaculatory apodeme about one fourth of apodeme’s total length, tines not particularly slender (Fig. 3).... 13
12 Gonostylus as long as gonocoxite, apex bent inwards, conspicuously densely setose. Tegmen strongly constricted subapically, rounded posteriorly............................................................................ D. rossica
- Gonostylus longer than gonocoxite, apex not bent, normally setose. Tegmen moderately constricted subapically, pointed posteriorly..................................................................................... D. xylophila
13 Ventral emargination of gonocoxites angular-shaped (Fig. 3). Mediobasal lobe of gonostylus roundish (Fig. 3).. D. penttineni
- Ventral emargination of gonocoxites evenly rounded. Mediobasal lobe of gonocoxites angular-shaped...... D. triangularis
14 Empodia as long as tarsal claws........................................................................ 15
- Empodia vestigial................................................................................... 16
15 Gonocoxites with darkly pigmented area around ventral emargination (Fig. 28). Tegmen with 4–6 sclerotized barbs of various sizes apicolaterally (Fig. 31)................................................................... D. unidentata
- Gonocoxites without darkly pigmented area. Tegmen with 6 or more sclerotized barbs of about same size apicolaterally................................................................................................. D. dentata
16 Apex of tegmen strongly narrowed. Gonocoxal processes absent.............................................. 17
- Apex of tegmen broadly rounded, truncate or concave. Gonocoxal processes present or absent....................... 18
17 Gonocoxal emargination with convex basal edge (Fig. 13). Tegminal apex acutely pointed (Fig. 15)........... D. foliicola
- Gonocoxal emargination with concave basal edge. Tegminal apex narrowly rounded......................... D. mixta
18 Eye bridge 0–1 ommatidium long....................................................................... 19
- Eye bridge 3-4 ommatidia long......................................................................... 20
19 Ventral emargination of gonocoxites with small, setose protuberances basolaterally........................ D. dispersa
- Ventral emargination of gonocoxites bordered by 2 pairs of processes.................................... D. feminea
20 Gonostylus with medio-subapical lobe (Fig. 10). Ventral gonocoxal emargination extremely large, with microtrichose lobe basally (Fig. 11)............................................................................... D. barbata
- Gonostylus with mediobasal lobe. Ventral gonocoxal emargination small, without lobe.................... D. separata
description: Published as part of Jaschhof, Mathias & Spungis, Voldemars, 2018, Towards reliable identification of male Dicerura: descriptions of three new and seven poorly known species in the Palearctic region (Diptera: Cecidomyiidae, Porricondylinae), pp. 85-103 in Zootaxa 4422 (1) on pages 101-102, DOI: 10.11646/zootaxa.4422.1.5, http://zenodo.org/record/1455505