| Popis: |
Morphological key to species in the Y. tristrigata species group Specimens must be set with wings spread to begin using this key. A vernier calliper is required to check measurements. Male specimens must often be examined microscopically and may require dissection in some instances. 1. Male specimen....................................................................................... 2 - Female specimen.................................................................................... 24 2. Median lobe of uncus exceptionally long, about as long as the distance between the apices of the upper pygofer lobe and dorsal beak................................................................................................ 3 - Median lobe of uncus short, not nearly as long as the distance between the apices of the upper pygofer lobe and dorsal beak 4 3. When viewed from dorsal side, black dorsal mark on tergite 3 extends laterally well beyond the upper margin of the timbal cavity; median lobe of uncus narrow at base, widest around mid length and tapering towards apex.......... Y. humphreyae - Black dorsal mark on tergite 3 more confined, not overlapping laterally with the timbal cavity; median lobe of uncus narrow, slightly expanding distally, with rounded apex.................................................. Y. corindi n. sp. 4. Head width - Head width ≥ 5 mm................................................................................... 14 5. Thorax mainly brown.................................................................................. 6 - Thorax mainly black................................................................................... 8 6. Tergite 1 pale brown; pronotum mainly pale brown...................................................... Y. celis - Tergite 1 black or dark brown; pronotum mainly brown or black................................................ 7 7. Fore wing length>20 mmm; cruciform elevation and surrounding areas adjacent to wing grooves all much paler and brighter than remainder of thorax...................................................................... Y. tristrigata - Fore wing length Y. fluviatilis 8. Pronotum mainly brown, contrasting with mesonotum.................................. Y. tristrigata (dark specimen) - Pronotum mainly dark brown to black, not distinctly paler than mesonotum....................................... 9 9. Lateral edges of tergites orange, with dark markings along posterior margin (broad or narrow, often diffuse)............ 10 - Lateral edges of tergites orange, without dark markings on posterior margin...................................... 11 10. Fore wing length usually> 20 mm; theca recurved distally through 180 degrees; apex weakly upturned..... Y. delicata n. sp. - Fore wing length Y. fluviatilis 11. Theca recurved distally through 180 degrees; apex straight or weakly upturned................................... 12 - Theca recurved distally through 120 degrees; apex straight or downturned....................................... 13 12. Fore wing length typically> 20 mm; apex of theca weakly upturned................................. Y. delicata n. sp. - Fore wing length Y. landsboroughi 13. Fore wing length> 20 mm; timbal long rib 4 appearing discontinuous, with dorsal and ventral areas connected by only a very narrow medial area........................................................................ Y. nigrimontana - Fore wing length Y. fluviatilis 14. Timbal with four long ribs; fourth (anteriormost) long rib fused to the anterior cuticle..................... Y. ignita n. sp. - Timbal with five long ribs, all separate from anterior cuticle and surrounded by pale timbal membrane................. 15 15. Timbal long rib 5 distinctly narrower than widest portion of adjacent long rib 4............................ Y. repetens - Timbal long rib 5 about equal in width to adjacent long rib 4.................................................. 16 16. Thorax mainly brown to dark brown..................................................................... 17 - Thorax mainly black.................................................................................. 20 17. Fore wing length> 26 mm.................................................................. Y. robusta n. sp. - Fore wing length 18. Cruciform elevation and surrounding areas adjacent to wing grooves all much paler and brighter than remainder of thorax............................................................................................. Y. tristrigata - Cruciform elevation and surrounding areas adjacent to wing grooves not all distinctly paler than remainder of thorax..... 19 19. Length of body typically> 18 mm; tergite 2 black medially......................................... Y. cumberlandi - Length of body Y. celis 20. Tergite 2 mainly orange.......................................................... Y. tristrigata (dark specimen) - Tergite 2 mainly black................................................................................ 21 21. Opercula relatively small, each Y. delicata n. sp. - Opercula not relatively small, each ≥2.0 mm wide.......................................................... 22 22. Apex of theca very short lanceolate with a pair of upright basal lobes........................................... 23 - Apex of theca produced as a long spine with ornamentation and without a pair of upright basal lobes..... Y. australicta n. sp. 23. Pronotal collar brown; tergites 3–7 yellow-brown with black markings.................. Y. robusta n. sp. (dark specimen) - Pronotal collar dark brown to black; tergites 3–7 orange with black markings............................ Y. robertsonae 24. Ovipositor sheath extends approximately 1 mm beyond apex of abdominal segment 9........................... Y. celis - Ovipositor sheath extends 25. Thorax mainly black.................................................................................. 26 - Thorax mainly brown (with black sigilla)................................................................. 33 26. Fore wing length> 27 mm............................................................................. 27 - Fore wing length 27. Tergites 3–7 predominantly orange...................................................................... 28 - Tergites 3–7 predominantly black.............................................................. Y. robertsonae 28. Specimen from South Australia............................................ Y. australicta n. sp. (larger specimens) - Specimen from New South Wales.............................................................. Y. ignita n. sp. 29. Fore wing length - Fore wing length> 22 mm............................................................................. 32 30. Legs with fore and mid tibiae mainly dark ochraceous to black..................................... Y. nigrimontana - Legs with fore and mid tibiae brown to orange-brown........................................................31 31. Eyes clearly red or dull red...................................................................... Y. fluviatilis - Eyes not clearly red or dull red; instead black, brown, grey or faded..................... Y. landsboroughi, Y. fluviatilis * 32. Head width Y. nigrimontana - Head width> 5.2 mm........................................... Y. australicta n. sp., Y. delicata n. sp., Y. repetens * 33. Sternites with dark triangular central markings............................................................. 34 - Sternites without dark triangular central markings.......................................................... 35 34. Ovipositor sheath extends 0.5 mm – Y. corindi n. sp., Y. humphreyae * - Ovipositor sheath extends Y. robusta n. sp. 35. Ovipositor sheath extends 0.5 mm – Y. corindi n. sp., Y. humphreyae * - Ovipositor sheath extends 36. Fore wing length> 27 mm.................................................................... Y. ignita n. sp. - Fore wing length 37. Body length Y. fluviatilis - Body length> 17 mm, fore wing length>21............................................................... 38 38. Thorax with cruciform elevation and surrounding areas adjacent to wing grooves distinctly paler and brighter than remainder of mesonotum............................................................................... Y. tristrigata - Thorax with cruciform elevation and surrounding areas adjacent to wing grooves not noticeably paler than remainder of mesonotum........................................................................................... 39 39. Abdominal tergites 3–7 with black lateral markings clearly defined................................... Y. cumberlandi - Abdominal tergites 3–7 with dull brown lateral markings diffuse and faded............................... Y. repetens * These species cannot be reliably differentiated with female specimens alone. Male specimens are required. In some cases, checking information on geographical distributions may be helpful. |
