Leeuwenia, Karny, 1912

Mound, Laurence A. & Tree, Desley J., 2021, Structural variation among species of Leeuwenia (Thysanoptera, Phlaeothripinae) with three new species from Australia, Zootaxa 4903 (3), pp. 439-447 : 441

Key to Leeuwenia species from Australia

1. Tube no more than 1.5 times as long as head................................................................ 2

-. Tube at least 2.0 times as long as head..................................................................... 4

2. Tergite IX with setae S1 and S2 unusually elongate, between 2.0 and 3.0 times as long as basal width of tube ( Fig. 12 )................................................................................................ aliceae sp.n.

-. Tergite IX setae S1 and S2 shorter, less than 1.5 times as long as basal width of tube................................ 3

3. Fore tarsus with prominent lateral tooth in both sexes.................................................. polyosmae

-. Fore tarsus without a prominent lateral tooth........................................................... diospyri

4. Antennal segment III at least 3.5 times as long as maximum width; prosternal basantra absent........................ 5

-. Antennal segment III less than 3.0 times as long as maximum width ( Fig. 16 ); prosternal basantra present ( Fig. 20 ) but sometimes weakly sclerotised ( Fig. 19 )........................................................................ 6

5. All femora and tibiae clear yellow; head about 1.6 times as long as width across eyes; antennal segment III less than 4.0 times as long as maximum width; tube less than 9 times as long as basal width................................ tetrastigmae

-. Mid and hind femora as brown as body, mid and hind tibiae yellow but brown at base; head 2.0 times as long as width across eyes; antennal segment III at least 5.0 times as long as maximum width; tube at least 13 times as long as basal width.................................................................................................. convergens

6. Pelta wider than long ( Fig. 21 ); prosternal basantra well developed with several setae ( Fig. 20 ); metanotum with several pairs of setae anterior to median pair; tergal wing-retaining setae slender and pointed............................. scolopiae

-. Pelta longer than basal width ( Figs 17, 18 ); prosternal basantra weak and without setae ( Fig. 19 ); metanotum without scattered setae anterior to major median setae; tergal wing-retaining setae broadly flattened.................................. 7

7. Bicoloured ( Fig. 2 ), head yellow medially, pronotum and abdominal segments II‒VII largely yellow; mid and hind legs with femora brown but tibiae yellow; pronotum posterior fifth weakly reticulate ( Fig. 7 ); male with large circular pore plate on sternite VIII............................................................................... cameroni sp.n.

-. Head, thorax and abdomen uniformly light brown, head with small pale area antero-medially ( Fig. 3 ); mid and hind legs with femora and tibiae brown; pronotum posterior fifth finely tuberculate ( Fig. 8 ); male with pore plate extending almost fully across sternite VIII............................................................................... irukandji sp.n.

Figures

FIGURES 7–14. Leeuwenia species. Head & pronotum 7–8: (7) cameroni sp. n. (8) irukandji sp.n. L. aliceae sp.n. 9–12: (9) head; (10) pronotum; (11) metanotum, pelta and tergite II; (12) tube. Tergites III–IV 13-14: (13) cameroni sp. n.; (14) irukandji sp. n.

FIGURES 15–21. Leeuwenia species. Antennal segments III–VIII 15–16: (15) aliceae sp. n.; (16) cameroni sp. n. Metanotum & pelta 17–18: (17) cameroni sp. n.; (18) irukandji sp. n. Prosternites 19–20: (19) irukandji sp. n.; (20) scolopiae. (21) scolopiae metanotum, pelta and tergite II.

FIGURES 1–6. Leeuwenia species. Females 1–3: (1) aliceae sp.n.; (2) cameroni sp.n.; (3) irukandji sp.n. Leaf galls 4–6: (4) colony of scolopiae; (5) colony of tetrastigmae with Teuchothrips sp. inquiline; (6) polyosmae gall.