Chalarus basalis Loew, 1873

Kehlmaier, Christian & Assmann, Thorsten, 2008, The European species of Chalarus Walker, 1834 revisited (Diptera: Pipunculidae), Zootaxa 1936, pp. 1-39 : 18-19

Chalarus basalis Loew, 1873

Chalarus basalis Loew, 1873: 215 .

Diagnosis: Male unknown. Female with frontal facets moderately enlarged (J92 Fig. 1 A); frons at narrowest point slightly less to slightly more than twice diameter of largest frontal facet; flagellum yellowish to dark brown; femora and tibiae vary from entirely yellowish to largely mid brown medially, tarsi yellowish; pulvilli of front and mid legs twice the length of hind legs and longer than distitarsus; hairs on femora yellow to light brown; hind femur with apical hairs of pdsr extending as far as apex; hairs on thorax and abdomen yellow to mid brown; lateral sides of tergites 1–2 or 3 paler (yellowish) than tergites 4–6 dorsally (mid to dark brown); ovipositor as in Figs 35, 37 & 39 . See Table 1 for coxI and ITS2 barcode sequence accession numbers.

Annotations: The female holotype was obtained for study. The taxon is very similar to C. pughi and reliable identification requires removal of the ovipositor. C. basalis differs in that tergite 9 is slightly shorter (lateral view); hence its slightly lower degree of curvature; base of tergite 9 with area around anal opening slightly broader (dorsal view), frontal facets slightly smaller (impossible to quantify), sternite 8 shorter. The yellow coloration of the anterior tergites cannot be used as a reliable identification character as this also occasionally occurs in C. pughi , as already pointed out by Jervis (1992). Male C. basalis is unknown at present, however, keyed out in Dunk (1997) on the basis of a singleton not captured in copula. The specimen was studied and is thought to belong to either C. fimbriatus or C. pughi . No host records are available.

Figures

FIGURES 1 – 6. Inner male genitalia (phallus). 1. C. fimbriatus agg.; 2. C. absconditus spec. nov.; 3. C. clarus; 4. C. immanis spec. nov.; 5. C. juliae; Abbreviations: lower ej. d., lower ejaculatory ductuli; mtdp, membranous tip of distiphallus; php, phallic processes; phs, phallic shaft; tdp, tip of distiphallus; upper ej. d., upper ejaculatory duct; 6. C. latifrons. Scale bars = 0.1 mm.

FIGURES 34 – 48. Female ovipositor. 34. C. pughi ventral view; 35. C. basalis ventral view; Abbreviation: s 7, sternite 7; 36. C. pughi dorsal view; Abbreviations: t 7, tergite 7; t 8, tergite 8; t 9, tergite 9; 37. C. basalis dorsal view; 38. C. pughi lateral view; 39. C. basalis lateral view; 40. C. fimbriatus lateral view; 41. C. fimbriatus Form A lateral view; 42. C. fimbriatus Form B lateral view; 43. C. juliae dorsal view; 44. C. leticiae dorsal view; 45. C. juliae lateral view; 46. C. leticiae lateral view; 47. C. elegantulus lateral view; 48. C. latifrons lateral view. Scale bars = 0.1 mm.