Psalidothrips trivius, Wang & Mound & Tree, 2019

Wang, Jun, Mound, Laurence A. & Tree, Desley J., 2019, Leaf-litter thrips of the genus Psalidothrips (Thysanoptera, Phlaeothripidae) from Australia, with fifteen new species, Zootaxa 4686 (1), pp. 53-73 : 66-67

Psalidothrips trivius sp.n.

( Figs 12, 16 , 35 )

Female aptera. Body light brown, head darker, darkest at apex of head, thorax lighter but shaded with brown laterally, abdominal segment IX and tube a little lighter than rest of abdomen; legs mainly yellow; antennae yellow, but segment I brown, II and VIII weakly shaded. Head without sculpture medially but with few lines laterally; genae weakly constricted behind eyes, without strong internal apodeme behind compound eyes; ocelli absent; compound eyes with 2 large and 1 small facets; postocular setae long and bluntly pointed, longer than half the distance between their bases; postocellar setae minute; maxillary stylets about two-thirds of head width apart, retracted half way to postocular setae ( Fig. 12 ). Antennal segment III with 1 sense cone that is often minute, IV with 2 slender sense cones, III–VIII each with pedicel; segment III longer than IV, VIII longer than VII ( Fig. 35 ). Pronotum without sculpture; setae aa, ml, epim and pa well-developed, am as long as median discal setae. Mesonotum with transverse sculpture near anterior margin; metanotum without sculpture. Mesopresternum absent, mesoeusternal anterior margin weakly eroded. Fore tarsal tooth absent. Pelta broad across tergite II with sculpture at anterior, campaniform sensilla absent; tergites II–VII each with one pair of minute straight wing-retaining setae; median setae minute on II–VII but long on VIII; tergite IX setae S1 as long as tube, anal setae as long as tube. Sternites with 3–5 pairs of minute discal setae.

Measurements (holotype female in microns). Body length 1890. Head, length 168; basal width 176; postocular setae 76, distance between their bases 130; postocellar setae 28, distance between their bases 58. Pronotum, length 153; median width 258; major setae am 10, aa 37, ml 67, epim 70, pa 75. Mesonotum posteromarginal setae 15. Metanotum median setae 21. Tergite IV median marginal setae 103; tergite VIII median setae 58, tergite IX setae S1 118, S2 100. Tube length 117; anal setae 122. Antennal segments III–VIII length 50, 46, 48, 51, 45, 52.

Male aptera. Similar to female but smaller; fore femora larger and tarsal tooth present ( Fig. 16 ); sternite VIII pore plate transverse and slender, almost reaching lateral margins of sternite.

Measurements (in microns). Body length 1590.Head, length 150; width 151; postocular setae53, postocellar setae 15. Pronotum, length 150; median width 225; major setae am 8, aa 25, ml 61, epim 53, pa 55. Tergite VIII median setae 40. Tergite IX setae S1 95, S2 75. Tube length 107; anal setae 108. Antennal segments III–VIII length 45, 38, 43, 47, 37, 48.

Specimens studied. Holotype female aptera. Queensland, Brisbane Forest Park, Centre Rd. , from litter, 26.iii.2008 ( DJT 930 ), in ANIC.

Paratypes: 10 females, 7 males, same data as holotype .

Comments. The body structure and sclerites of this species are similarly to tritus . However, it has the pronotal aa setae longer, only one sense cone on antennal segment III and lacks the strong internal apodeme behind the compound eyes that is typical of tritus and related species.

Figures

FIGURES 10–18. Psalidothrips species, head & pronotum. (10) minantennus; (11) postlei; (12) trivius; (13) tritus holotype; (14) tritus macropterous female; (15) verus; (16) trivius male; (17) wellsae holotype; (18) wellsae apterous female.

FIGURES 19–37. Psalidothrips species. Mesopresternum 19–22 (19) gloriousi; (20) driesseni macroptera; (21) driesseni aptera; (22) howei. Male pore plate 23–30 (23) brittoni; (24) cecryphalus; (25) driesseni; (26) howei; (27) minantennus; (28) postlei; (29) taylori; (30) tritus. Antennae 31–37 (31) brittoni; (32) cecryphalus; (33) minantennus; (34) platetus; (35) trivius; (36) verus; (37) wellsae.