Key to the triozid fauna of Casuarinaceae

1. Fore wings of female usually with dark markings [clear in species from New Caledonia]; fore wings of male clear; anterior margin of vertex not overhanging genal processes; genal processes short conical, little-declined to longitudinal axis of body and visible from above; female proctiger short with a pair of lateral lobes; male parameres short, narrow, little curved to apex; nymphs broadly ovate, weakly sclerotised, typically ‘triozine’ in type; host: Casuarina ................................................................................................ Casuarinicola Taylor [see Taylor et al. 2010]

- Fore wings of female and male clear; anterior margin of vertex overhanging genal processes; genal processes moderate in length, produced ventrad to longitudinal axis of body; female proctiger short with rounded apex or with apical upturned process or hook; male parameres short, strongly curved to apex, long and thin (Figs 94–95, 98) to short and wide (Figs 131, 134); nymphs scale-like, usually strongly to moderately sclerotised; host: Allocasuarina .................................. 2

2. Rhinaria on antennal segments 4, 6 and 9; hind tibia without apical spurs, at most with a corona of setae; female proctiger short, with apex rounded (without an apical upturned process or hook) (Figs 18, 39)… [ Aacanthocnema]3

- Rhinaria on antennal segments 4, 6, 8 and 9; hind tibia with 2 inner and 1 outer apical spurs; female proctiger short, with an apical upturned process (Figs 99, 102) or prominent hook (Figs 96, 135).............. [ Acanthocasuarina gen. nov.]....8

3. Fore wings with brown infuscation along veins R+M+Cu, M, m1+2, m3+4, Cu, Cu1a, Cu1b and distal portion of Rs (Figs 3, 10–11).............................................................................................. 4

- Fore wings without brown infuscation (e.g., Figs 23–24), or at most with brown infuscation restricted to portion of vein Cu1a (Figs 47–48)......................................................................................... 5

4. Large species (for all parameters measured in Tables 1–3); antennal length proportional to head width long, AL:HW>1.5; fore wings long, WL:WW>3.0; host: Allocasuarina tolulosa; distribution: coastal, subcoastal eastern Australia .......................................................................................... Aa. burckhardti Taylor, sp. nov.

- Smaller species (for all parameters measured in Tables 1–3); antennae shorter, AL:HW <1.5; fore wings short, WL:WW <3.0; host: Allocasuarina distyla; distribution: coastal, subcoastal south-eastern Australia, Tasmania.... Aa. casuarinae (Froggatt)

5. Head narrow, <0.70 mm, distinctly narrower than mesoscutum; male parameres strongly curved inward with flattened, bladelike apices (Fig. 64); host: A. torulosa; distribution: coastal, subcoastal eastern Australia ...... Aa. torulosae Taylor sp. nov.

- Head moderate to wide,> 0.70 mm, equal to or wider than mesonotum; male parameres strongly curved inward with rounded, horn-shaped apices (Figs 38, 41, 61)...................................................................... 6

6. Head very wide,> 0.80 mm; vertex very short and wide (VL:HW <0.35; AL:HW <1.20); anterior edge of vertex rather flat when viewed from dorsal aspect (Figs 29–30); host: A. huegeliana; distribution: subcoastal, inland Western Australia ................................................................................. Aa. huegelianae Taylor sp. nov.

- Head moderately wide, ≤ 0.80 mm; vertex long and narrow (VL:HW>0.35; AL:HW>1.20); anterior edge of vertex distinctly curved when viewed from dorsal aspect (Figs 19–20, 43–44, 51–52)............................................. 7

7. Basal half of adult fore wing vein Cu1a with brown infuscation (Figs 47–48); male parameres with basal lobe (Fig. 61); host: A. luehmannii; distribution: inland eastern Australia .................................. Aa. luehmannii Taylor sp. nov.

- Basal half of adult fore wing vein Cu1a without infuscation; basal portion of male parameres more or less parallel-sided when viewed from lateral aspect, without basal swelling (Fig. 38); host: A. verticillata; distribution: southern Australia, Tasmania.................................................................................... Aa. dobsoni (Froggatt)

8. Vertex short and wide (VL:VW <0.60) (Table 4)............................................................ 9

-. Vertex moderately long and wide (VL:VW>0.65).......................................................... 10

9. Male terminalia as in Fig. 93; male parameres long, thin, 0.25–0.27 mm (Figs 94–95); dorso-posterior margin of female proctiger angled when viewed from lateral aspect; proctiger with a prominent sharply-upturned apical hook (Fig. 96); host: A. acutivalvis; distribution: subcoastal, inland Western Australia ................................... Ac. acutivalvis sp. nov.

- Male terminalia as in Fig. 97; male parameres moderately long, thin, 0.23–0.25 mm (Fig. 98); dorso-posterior margin of female proctiger evenly curved when viewed from lateral aspect; proctiger with less prominent upturned apical process (Fig. 99); host: A. campestris; distribution: subcoastal, inland Western Australia ...................... Ac. campestris sp. nov.

10. Cu1 cell value <1.00 (Table 5).......................................................................... 11

- Cu1 cell value>1.15.................................................................................. 12

11. Male parameres short, parallel-sided when viewed from lateral aspect (Fig. 131); dorso-posterior margin of female proctiger moderately curved when viewed from lateral aspect; proctiger with a less prominent upturned apical process (Fig. 132); host: A. (?) littoralis; distribution: Tasmania.................................................... Ac. tasmanica sp. nov.

- Male parameres short, with prominent posterior lobe when viewed from lateral aspect, (Fig. 134); dorso-posterior margin of female proctiger angled when viewed from lateral aspect; proctiger with a prominent sharply-upturned apical hook (Fig. 135); host: A. verticillata; distribution: southern Australia, Tasmania.............................. Ac. verticillatae sp. nov.

12. Male parameres moderately long, pyriform, 0.18–0.21 mm (Fig. 101); dorso-posterior margin of female proctiger evenly curved to apex when viewed from lateral aspect (Fig. 102); host: A. diminuta; distribution: central New South Wales .......................................................................................... Ac. diminutae sp. nov.

- Male parameres moderately long, thin, 0.21–0.23 mm (Fig. 128); lateral profile of proctiger rather flat dorsally, angling more abruptly to apex when viewed from lateral aspect (Fig. 129); host: A. muelleriana; distribution: southern South Australia .................................................................................... Ac. muellerianae sp. nov.