Dicerura stipator Mamaev, 1972

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), Zootaxa 4422 (1), pp. 85-103 : 96-97

Dicerura stipator Mamaev, 1972

Figs 25–27

Dicerura stipator , another species found only in the Far East of Russia, is known from two males and one female, all mounted by Mamaev on one and the same microscope slide. Mamaev (1972) did not indicate which of the

males is to be regarded as the holotype, so both are referred to here as syntypes. The genitalia of both specimens are

partly distorted and collapsed, which is why the gonostylar structure cannot be described here. From what is left of

the gonostyli, we assume that their outline is similar to that in D. penttineni ( Fig. 3 ). Mamaev’s (1972) original

description of D. stipator , which does not refer to characters of the female and lacks illustrations, is too unspecific

for the purpose of identification.

Diagnosis. Dicerura stipator is a typical member of the iridis group. It is the only species of Dicerura in which the two tines of the apical fork of the ejaculatory apodeme are serrate medially ( Fig. 27 , ↓1). Of the gonocoxites, the

ventral emargination is wide and shallow; the two pairs of processes bordering the emargination are approximately same size; the ventroposterior edge is broadly pigmented ( Fig. 25 , ↓2); and the dorsal portions are strongly bulging

medially. The tegmen of D. stipator , which is generally similar to that of D. penttineni (cf. Fig. 3 ), has a pair of small, sclerotized barbs and, behind the barbs, short appendages ( Fig. 27 , ↓3); its narrowly rounded apex is

reinforced by a roundish, sclerotized knob, which resembles the condition found in D. unidentata . The ninth tergite

of D. stipator is again similar to that of D. penttineni (cf. Fig. 4 ), but the narrow, apical portion, which is darkly

pigmented and provided with dense microtrichia on the inside, is larger ( Fig. 26 ).

Material examined. Two syntype males, mounted on one and the same slide (no. P-Di0139 in ZMUM), with

the data as specified in the original description ( Mamaev 1972).

Figures

FIGURES 25–27. Dicerura Stipator, male, syntype. 25: Genitalia (gonostyli omitted), ventral. 26: Ninth tergite, dorsal. 27: Tegmen and ejaculatory apodeme, ventral. Scales 0.05 mm. Arrows refer to characters described in the diagnosis.

FIGURES 3–5. Dicerura penttineni, male, holotype. 3: Genitalia, ventral. 4: Ninth tergite, dorsal. 5: Tegmen and ejaculatory apodeme, ventral. Scales 0.05 mm. Arrows refer to characters described in the diagnosis.