Berdeniella desnensis, Ježek, 2006

Ježek, Jan, 2006, Psychodidae (Diptera) of the Jeseníky Protected Landscape Area and its environs with descriptions of two new Berdeniella species from the Czech Republic, Acta Entomologica Musei Nationalis Pragae 46, pp. 151-192 : 153-156

Berdeniella desnensis sp. nov.

( Figs. 1-15 )

Type locality. Czech Republic, north-western Moravia, Hrubý Jeseník Mts., environs of Mravenečník Mt., Divoká Desná river near Tupý vrch Mt.

Type material. HOLOTYPE: J, CZECH REPUBLIC: MORAVIA bor.-occ., Jeseníky PLA, environs of Mravenečník Mt., Divoká Desná river near Tupý vrch Mt. (5868-5968), 1122 m a.s.l., small pumped storage reservoir, waterlogged spots, rapids, 13.vi.1995, Loc. no. 131. Vegetation: Fagus , Alnus, Aruncus, Pteropsida. Slide with dissected specimen, Cat. No. 34285, Inv. No. 14783 ( NMPC). PARATYPES: 26 JJ (slides, NMPC). The same locality, date and collector, Cat. No. 34309-34310, Inv. No. 14807-14808 (2 JJ). Jeseníky PLA, Karlov pod Pradědem env., Malá Morávka (5969), meadow, peat bog, slope spring area, 6.vi.1994, Loc. no. 76. Vegetation: Alnus, Filipendula, Urtica, Myosotis, Equisetum, Musci. Cat. No. 34305-34308, Inv. No. 14803-14806 (4 JJ). Jeseníky PLA, Karlov pod Pradědem, Moravice river (5969), forest marshes, overhanging boughs of trees in river bed, 7.vi.1994 and 11.vi.1997, Loc. no. 79. Vegetation: Picea , Acer, Sorbus, Rubus , Petasites, Filipendula, Equisetum, Caltha, Oxalis, Musci , Apiaceae . Cat. No. 34297-34301, Inv. No. 14795-14799 (5 JJ). Jeseníky PLA, Kouty nad Desnou, Nový most bridge, Divoká Desná river (5868), shore plants, 13.vi.1995, Loc. no. 101. Vegetation: Acer, Fraxinus , Fagus, Sorbus , Alnus, Rosa, Ribes , Petasites, Pteropsida , Apiaceae . Cat. No. 34302-34304, Inv. No. 14800-14802 (3 JJ). Rýmařov, southern border of Jeseníky PLA (6069), field, drain, 11.vi.1994, Loc. no. 160. Vegetation: Alnus, Sambucus, Filipendula, Urtica, Galium , Apiaceae . Cat. No. 34311, Inv. No. 14809 (1 J). Rýmařov env., Dolní Moravice, Moravice river (6069), meanders, marshes, 15.vi.1994, Loc. no. 161. Vegetation: Alnus, Fraxinus , Acer, Frangula , Salix, Corylus , Petasites, Filipendula, Lychnis, Veratrum, Valeriana, Myosotis, Caltha, Scirpus, Lysimachia , Aegopodium, Pteropsida. Cat. No. 34286-34296, Inv. No. 14784-14794 (11 JJ). All material J. Ježek leg. (sweeping).

Description. Male. Eyes widely separated, frontoclypeus with oval patch of insertions of hairs connected with dorso-ventral stripe of irregularly arranged hair pits between upper apices of eyes, the latter consisting of four rows of facets ( Fig. 1 ). Frontal suture developed, triangular. Minimum distance between eyes 2.5 times as wide as diameter of facet ( Fig. 8 ). Ratios of distance of both tangential points of eyes (dorsal and ventral) to minimum width of frons 3.8: 1, to facet diameter 9.5: 1. Scape short ( Fig. 2 ), almost cylindrical, slightly longer than pedicel, the latter hardly globular, 14 flagellomeres. Basal flagellomeres spindle-shaped, apical ones smaller, cask-shaped, terminal flagellomere almost globular, with very short excentric digitiform protuberance on top; a pair of ascoids as in Fig. 9 . Length ratios of maxillary palpomeres 1: 1.3: 1.3: 2.3, palpomere 4 annulate ( Fig. 3 ). Terminal lobe of labium bulbous ( Fig. 10 ), with many sensory setae. Ratio of maximum length of cibarium to length of epipharynx 2: 1. Thoracic sclerites as in Fig. 4 . Wings ( Fig. 5 ) widely lancet-shaped, clear, 2.0- 2.8 mm (2.8 mm in holotype) long, wing membrane bare, radial and medial forks complete; following veins or their parts strengthened: Sc, R 2+3, R 5, M 4 and Cu completely, R 1, R 2 and R 3 only in their distal parts. Basal costal nodes distinct, well visible, Sc uninterrupted, golf-club shaped. M 3 and Cu with inconspicuous connection to M 4. R 5 almost extending into apex of wing. Medial wing angle 163° (BCD). Indices of wing AB: AC: AD = 4.3: 4.3: 4.3; BC: CD: BD = 1: 1.6: 2.5. Maximum wing length equal to 2.4 times its maximum width and maximum length of haltere equal to 2.9 times its maximum width. Ratios of lengths of femora, tibiae and first tarsomeres: P 1 = 1.8: 1.9: 1; P 2 = 2: 2.3: 1.1; P 3 = 2.3: 2.8: 1.2. Fore claws ( Fig. 11 ) inconspicuously S-shaped with two backward-pointing dents. Basal apodeme of aedeagal complex short and straight in dorsal view and slightly arched in lateral view.Aedeagal complex with characteristic inner structures ( Figs. 7 , 14 ). Gonocoxites ( Figs. 6 , 14 ) rather long, a little arched in dorsal view, without protuberances outside. Gonostyli inconspicuously shorter than gonocoxites, uniformly thick basally and afterwards abruptly tapering to apex. Epandrium ( Figs. 12, 13 ) with two long diagonal and narrow fields of insertions of hairs posteriorly, paired apertures hardly visible. Sclerotized remainders of tergite and sternite 10 inside of epandrium shaped as long triangular plate with wrinkled sides. Hypandrium ( Fig. 14 ) narrow, formed by inconspicuous V-shaped strengthening in middle. Cells on both sides of the strengthening 2-4 in number, very small, white, and coherent. Hypoproct small, tongue-shaped, epiproct fold-like, both structures haired. Surstyli long, almost straight, a little thickened basally, conspicuously longer than epandrium, subapically with very long retinaculum and two minute sensory spines ( Fig. 13 ).

Female. Unknown.

Differential diagnosis. Berdeniella desnensis sp. nov. resembles B. chvojkai Ježek, 1999 ; both species belong to the moderately small B. freyi- group established by Vaillant and characterized by two very small sensory spines near basis of very long retinaculum on apical surface of surstylus; Figs. 12 and 13 . The new species differs in the shape of hypandrium ( Fig. 14 ), hardly visible paired epandrial apertures ( Fig. 12 ), and basally narrow, distally broadening inner phallic sclerites ( Figs. 14, 15 ). In males of B. chvojkai , the hypandrium has a conspicuous oblong strengthening in the middle and only one cell near both shorter sides of that, the paired epandrial apertures are conspicuous, and the inner phallic sclerites are broad basally and narrowing distally.

Etymology. Named after the type locality – Divoká Desná river in the Jeseníky PLA.

Bionomics. Unknown. Adults were collected on shores of meandering mountain streams and rivers, in highland drains and in slope spring areas.

Distribution. Czech Republic, northern Moravia.

Figures

Figs. 1-7. Berdeniella desnensis sp. nov., J. 1 – head; 2 – basal antennomeres; 3 – maxilla and maxillary palpus; 4 – lateral view of thoracic sclerites; 5 – wing; 6 – lateral view of gonocoxite and gonostyle; 7 – lateral view of aedeagal complex. Scales = 0.1 mm (Figs. 1-4, 6-7); 1 mm (Fig. 5).

Figs. 8-15. Berdeniella desnensis sp. nov., J. 8 – facets; 9 – apical antennomeres; 10 – dorsal view of terminal lobe of labium; 11 – dorsal view of fore claw; 12 – dorsal view of epandrium and surstyli; 13 – same, lateral view; 14 – dorsal view of aedeagal complex and gonopode; 15 – dorso-caudal view of aedeagal complex. Scales = 0.1 mm (Figs. 8-10, 12-15); 0.05 mm (Fig. 11).