Hemimormia nyangerensis Ježek & Oboňa, 2019

Ježek, Jan & Oboňa, Jozef, 2019, Three new species of moth flies (Diptera, Psychodidae, Psychodinae) from the Afrotropical Region, Zootaxa 4577 (1), pp. 73-90 : 78-81

Hemimormia nyangerensis Ježek & Oboňa sp. nov.

( Figs. 18–33 , 56 )

Description. Male. Head almost rounded from frontal view (1.2 times broader in horizontal axis), with raised concave tubercle dorsally and swollen kidney or C-shaped compound eyes laterally ( Fig. 18 ). Posteriolateral margins of eyes without enlarged alveoli of supraocular bristles on both sides. Eyes contiguous ( Fig. 18 ) and formed by three facet rows ( Fig. 19 ). Dorsal 1/3 of the eye section 1.4 times as narrow as ventral 2/3. Ratio of distances of apices of eyes (tangential points) to facet diameter 9:1. Scar patch above the upper apices of eyes is not divided, in contrast to two quite separated kidney-shaped alveoli patches near the basis of antennae. Antennae incomplete ( Fig. 20 ). Scape cylindrical, 1.5 times as long as pedicel which is almost globular. Basal flagellomeres pitcher-shaped, bulbose part conspicuously asymmetrical in horizontal axis, necks (internodes) represent 1/3 of the length of article. Ascoids paired, filamentary, with 6 filaments arising from one papilla ( Fig. 21 ). Mouthparts extending slightly beyond basal palp segment ( Fig. 18 ). At the labellum, as shown in Fig. 27 , miniature spines between both lobes are not developed. Labellum bulbose, with digital fused protuberances in between ( Fig. 27 ). Length ratio of maxillary palps 1.0:1.3:1.3:1.9, segment 4 annulate ( Fig. 26 ). Ratio of maximum length of cibarium to length of epipharynx 1.3:1 ( Fig. 28 ), labrum pointed.

Thorax. Anepisternum setae patch is almost semi-circular, anepimeron with approximately longly elliptic setose patch ( Fig. 22 ). Spiracles set low on mesothorax. No thoracic allurement organs. Wings ( Fig. 56 ) narrowly lanceolate, 1.5 mm long—holotype, paratypes 1.4–1.7 mm, pointed distally, not expanded at the posterior margin. The ending of R 5 a little beyond the tip of wing. Wing membrane slightly infuscated. Following veins or their parts strengthened: Sc only in the origin; R 1 distally (proximally very weakened); R 2, R 3 (proximally a little weakened), R 2+3+4, whole R 5; M 2, M 3 and CuA 1 distally. Radial and medial forks complete, positioned as seen on Fig. 56 . Wing indices AB:AC:AD = 4.1:4.5:4.8; BC:CD:BD=1.1:1.0:1.9. Wing index 3.5, medial wing angle 162° (BCD). Halteres ( Fig. 29 ) almost ovoid with a prolonged stem. Ratio of maximum length of halteres to their maximum width approximately 3.0:1. Ratios of lengths of femora, tibiae and first tarsal segments P 1 2.3:2.3:1.0, P 2 not observed, P 3 2.7:3.2:1.3. Paired tarsal claws of P 1 bent distad, with two ventral thickening ( Fig. 30 ).

Male genitalia. Aedeagus racquet-shaped, clearly symmetrical, ejaculatory apodeme rod- or bar-shaped, bilobed proximally and gradually widened distally, 2.4 times as long as aedeagal complex ( Figs. 24, 25 , 33 ). Parameres fused dorsally ( Fig. 25 ), encircling aedeagus, with conical moveable appendages dorsally, as long as posterior part of aedeagus. Posterior appendages of parameres directed posteriodorsally ( Figs. 24 , 33 ) or anteriodorsally ( Fig. 25 ). Gonocoxites as long as cone-shaped gonostyli ( Fig. 32 ), bent, without bristles terminally ( Figs. 24 , 32 ). Epandrium square-shaped, bare ( Figs. 23 , 31 ), central aperture paired, a rest of ventral plate with five arms ( Fig. 31 ). Hypandrium inconspicuous, stripe-shaped ( Fig. 24 ). Hypoproct and epiproct tongue-shaped, prominent, approximately of the same size, both parts haired ( Figs. 23 , 31 ). Epandrial clasping lobes almost cylindrical, haired and a little bent ( Figs. 23 , 31 ), as long as epandrium (measured with hypoproct), with five compact conspicuous tenacula, not frayed apically ( Figs. 23 , 31 ).

Female. Unknown.

Differential diagnosis. Hemimormia nyangerensis sp. nov. is morphologically similar to H. acrostylis ( Duckhouse, 1978) , however, head is rounded ( Fig. 18 ), kidney-shaped alveoli patches near the basis of antennae are separated ( Fig. 18 ), distance of radial wing fork and ending of R 1 is equal to distance of ends of R 4 and R 5 (1:1)—see Fig. 56 , medial wing angle is 162°, wing index is 3.5, parameres are approximately as long as posterior part of aedeagus ( Figs. 24 , 33 ) and ventral plate of epandrium is reduced and membraneous, with five arms ( Fig. 31 ). On the other hand, H. acrostylis has head conical, alveoli patches connected, distances of above-mentioned points conspicuous (4:1), medial wing angle 155°, wing index 3.0, parameres reaching well beyond posterior part of aedeagus and ventral plate sclerotized, harpoon-shaped, with several little hooks proximally and two parallel trapezoidal plates distally.

Type material. Holotype ♂: Equatorial Africa : Kenya, Nyangera, Victoria Lake environment, 1 141 m a.s.l. ( Fig. 59 ), 0°3ꞌ 56.296ꞌ ꞌ S, 34°4ꞌ 53.251ꞌ ꞌ E, 6.xii.2003 – 3.iii.2004, Malaise trap, I. Přikryl et al. leg. Slide with a dissected specimen, Cat. No. 34748, Inv. No. 24209 ( NMPC).

Paratypes 6 ♂ (slides): The same locality, method, collector and date, Cat. No. 34749–34754, Inv. No. 24210– 24215 ( NMPC). Supplemented paratype 1 ♂ (slide): same, 14.ix.–10.x.2003, Cat. No. 34755, Inv. No. 24216 ( NMPC). Additional paratypes 3 ♂ (slides): same, 10.x.–6.xii.2003, Cat. No. 34756–34758, Inv. No. 24217–24219 ( NMPC). Slides are often with dissected specimens .

Type locality. Equatorial Africa: Kenya, Nyangera, Victoria Lake environment.

Etymology. The species is named after the type locality in Kenya.

Bionomics. Unknown. Adults were collected in wetland rushes of margins of the water body with rapidly growing Cyperus papyrus L.

Distribution. This species is currently known from a single locality in Kenya.

Figures

FIGURE 59. Wetland rushes of margins of the water body with a growth of Cyperus papyrus L. Kenya, Nyangera, 15.i.2002. Photo by Ivo Přikryl.

FIGURES 18–25. Hemimormia nyangerensis Ježek & Oboňa sp. nov. male. 18. Head, frontal view. 19. Frons and facets in detail, frontal view. 20. Scape, pedicel and basal flagellomeres. 21. A medial flagellomere in detail. 22. Thoracic sclerites, lateral view. 23. Epandrium and epandrial clasping lobes, lateral view. 24. Aedeagal complex and gonopod, dorsal view. 25. Aedeagal complex, abnormal position of parameres, dorsal view. [Scale: 22 = 0.3 mm; 18–21, 23–25 = 0.1 mm]

FIGURES 26–33. Hemimormia nyangerensis Ježek & Oboňa sp. nov. male. 26. Maxilla and palpus maxillaris. 27. Terminal lobes of labium. 28. Cibarium, labrum and epipharynx. 29. Haltere, lateral view. 30. Tarsal claw of P 1, lateral view. 31. Epandrium and epandrial clasping lobes, dorsal view. 32. Gonopod, lateral view. 33. Aedeagal complex, lateral view. [Scale: 26–33 = 0.1 mm]

FIGURES 56–57. 56. Hemimormia nyangerensis Ježek & Oboňa sp. nov. male wing (photo). 57. Iranotelmatoscopus kenyensis Ježek & Oboňa sp. nov. male wing (photo). [Scale: 56, 57 = 1 mm]