Eurystylops oenipontana Hofeneder, 1949

Eurystylops oenipontana Hofeneder, 1949 View in CoL

( Figs 6–9 View Fig View Fig View Fig View Fig )

Eurystylops oenipontana Hofeneder, 1949: 119 View in CoL (original description, syntypes in Friese collection, their current location unknown).

Material examined. CZECH REPUBLIC: 1 ♀ ( JSPC), Malé Březno env., České středohoří Protected Landscape Area, 16.vii.2006, swept, J. Batelka lgt., host: Dufourea dentiventris ; 1 ♀ ( NMPC),Arnultovice env., 9.vii.1940, swept, K. Špaček lgt., host: D. dentiventris ; 1 ♀ ( NMPC), Praha env., Radotín, 30.vi.1964, swept, B. Tkalců lgt., host: D. dentiventris ; 1 ♀ ( NMPC), Strančice env., vii.1960, swept, V. Kočmíd lgt., host: D. dentiventris ; 1 ♀ ( NMPC), Vrané nad Vltavou env., vii.1954, swept, V. Kočmíd lgt., host: D. dentiventris ; 1 ♀ ( NMPC), Vitín env., České středohoří PLA, 10.vii.1921, collector unknown, host: D. dentiventris ; 1 ♀ ( NMPC), Polička env., Františky, 24.vii. (without year), swept, L. Duda lgt., host: D. dentiventris ; 1 ♀ ( NMPC), Všenory env., 27.vii.1912, swept, O. Šustera lgt., host: D. dentiventris ; 3 ♀♀ ( NMPC), Malá Skála env., without date, swept, J. Obenberger lgt., host: D. dentiventris ; 1 ♀ ( NMPC), Káraný nad Labem env., without date, swept, J. Obenberger lgt., host: Dufourea inermis ; 2 ♀♀ ( NMPC), Přebuz env., Přebuz moorland, 12.viii.2011, P. Kment lgt., host: D. dentiventris ; 6 ♀♀ ( JSPC), Přebuz env., Přebuz moorland, 21.vii.2021, J. Straka lgt., host: D. dentiventris . SWITZERLAND: 1 ♀ ( EEC),Haldenstein, 8.viii.1997, swept,A. Müller lgt., host: D. inermis ; 1 ♀ ( JSPC), Leuk env., 8.vii.2008, combined trap, Y. Chittaro lgt., host: D. dentiventris .

Diagnosis of female cephalothorax. See diagnosis of the female cephalothorax of Eurystylops ogloblini sp. nov.

Redescription of female cephalothorax. Shape and colouration. Cephalothorax variable but always wider than long, length 0.50–0.58 mm, width 0.64–0.73 mm. Flattened in cross-section, semi-elliptic. Anterior head margin not protruding from cephalothoracic capsule or only very slightly. Thorax slightly ( Fig. 7C View Fig ) or distinctly ( Fig. 7A View Fig ) widening posteriorly. Pro-mesothoracic and meso-metathoracic segmental border not constricted laterally, border unrecognizable. Colouration from pale yellow to dark brown. Cephalothorax with conspicuous colour pattern with posterolateral parts darker than anterior part.

Head capsule. Length of head slightly more than one third of cephalothorax. Length proportion of head/cephalothorax 0.36–0.40 including lateral cephalic extension. Width of birth opening 0.36–0.42 mm. Head predominantly pale, without dark areas. Clypeal region well delimited from labral area (sbcl, Fig. 8C View Fig ); labral area well visible from ventral side, not constricting clypeal area. Apical margin of clypeal area blunt or forming slightly protruding clypeal lobe (cll, Fig. 7C View Fig ). Clypeal surface smooth with distinctly visible sensilla present on clypeal surface, more or less evenly scattered (cls, Fig. 8C View Fig ). Cuticle of frontal region distinctly wrinkled horizontally (fr, Fig. 4D View Fig ). Segmental border between head and prothorax indicated by distinct suture on dorsal side (sbhp; Figs 7B View Fig , 8D View Fig ). Head and prothorax distinctly separated by birth opening ventromedially, and laterally by unrecognisable suture as in Stylops ( LÖWE et al. 2016) .

Supraantennal sensillary field smooth, with distinctly recognisable sensilla. Not delimited by furrow medially, without recognisable border. Clypeal area not clearly delimited from supraantennal sensillary field, clypeal sensilla hardly distinguishable from sensilla of supraantennal sensillary field (ssf, cl; Fig. 4D View Fig ). Some sensilla also dispersed medially between both sensillary fields (ssf, Fig. 4D View Fig ).

Antenna. Vestiges of antennae absent.

Labrum. Ventral field elliptic, not protruding. Dorsal field elongated, slightly arcuate, flat, not protuberant, ~ 5–6× wider than long in midline (dlf, Fig. 8C View Fig ). Border between dorsal and ventral labral field well delimited. Dorsal field with several setae, not overlapping clypeal area.

Mandible anteromedially directed at angle of 35–45°, not protruding from mandibular capsule (md, Fig. 8C View Fig ). Mandibular bulge more or less distinctly raised, sensilla not visible. Cuticle wrinkled laterally, completely smooth medially ( Fig. 5A View Fig ). Mandibular tooth conspicuously large, narrow, pointed apically (mdt, Fig. 8C View Fig ).

Maxilla completely absent as individual structure, fused with labial area, both forming maxillolabial complex (mxlc, Fig. 8C View Fig ). Surface of maxillolabial complex completely smooth. Maxillary base fused, part of maxillolabial complex. Vestige of maxillary palp absent. Submaxillary groove present, produced posterolaterally, curved along birth opening (smxg, Fig. 8C View Fig ).

Labium. Labial area indistinct, only delimited anteriorly by mouth opening and posteriorly by birth opening. Laterally completely fused with maxillae, without visible borders. Surface completely smooth.

Mouth opening medially straight or concave, laterally arcuate, area around mouth opening slightly lighter in colour (os, Fig. 8C View Fig ).

Thorax. Pro-mesothoracic and meso-metathoracic borders indistinct on ventral side, hardly recognisable on colour photos, but more distinct on SEM image (sbpm, sbmm; Fig. 8A View Fig ), medially separated by indistinct impressions. Change in cuticular sculpture on pro-mesothoracic borders and meso-metathoracic borders hardly visisble on SEM and colour images (pst, mst, mtst; Fig. 8A View Fig ). Pro-mesothoracic and meso-metathoracic borders indistinct dorsally, almost unrecognisable. Border between metathorax and abdomen recognisable as change in cuticular surface structure (asI, Fig. 8A View Fig ). Cuticle of prothorax (prosternum) uniformly pale orange, completely reticulated, posteriorly without transverse group of pigmented papillae. Rarely some papillae present on prosternum but scattered, not regularly arranged.Anterior part of prosternal extension not conspicuously translucent, only outermost edge slightly transparent. Mesosternum reticulated ventrally, lateral parts mostly smooth. Metasternum completely reticulated, surface nearly reaching abdominal spiracles laterally. Membranous patches of cuticle completely absent on mesosternum and anterior part of metasternum. Pigmented papillae lacking posteriorly on metasternum. Prothorax, mesothorax and metathorax completely fused dorsally, but indistinct borders recognisable. Surface smooth or slightly wrinkled, dorsally translucent in comparison with head capsule ( Figs 7B, D View Fig ).

Abdominal segment I and spiracles. Sclerotised abdominal part of abdominal segment I smooth on dorsal side, slightly wrinkled ventrally. Colouration of abdominal segment I variable from dark brown, in contrast to pale metathorax, to pale orange in some specimens. Borders between smooth abdominal segment I and reticulated or wrinkled metathorax well recognisable in ventral view, dorsally distinct laterally but indistinct medially. Spiracles located on posterior third of cephalothorax, not elevated, with anterolateral orientation. No distinct cuticular spines present on lateral region of abdominal segment I. Lateral part of abdominal segment I below spiracles forming distinct spiracular corner (sc, Fig. 7A View Fig ).

Male and primary larvae. Unknown.

Hosts. Dufourea dentiventris (Nylander, 1848) , D. inermis (Nylander, 1848) .

Phylogenetic relationships. Related to Eurystylops ogloblini sp. nov. (Benda & Straka unpubl.).

Distribution. Central Europe: Austria ( HOFENEDER 1949), Czech Republic (this study), Germany ( KINZELBACH 1971), Switzerland ( HOFENEDER 1949) ( Fig. 11 View Fig ).