Liothrips dayulingensis, Wang & Lin, 2020

Wang, Chin-Ling & Lin, Feng-Chyi, 2020, Genera and species of the Liothrips lineage (Thysanoptera, Phlaeothripinae) from Taiwan, Zootaxa 4861 (3), pp. 349-375 : 356-358

Liothrips dayulingensis sp. n.

( Figs 20–27 )

Female macroptera. Body length 2.6 mm. Color brown; antennal segments I and II dark brown, same colour as head, III yellow, IV yellow with distal end greyish brown, V basal half yellow and distal half brown, VI mostly brown with basal 1/3 yellow, VII & VIII dark brown, same colour as head; all femora brown, fore tibiae yellow and brownish in median portion, mid and hind tibiae brown, except distal ends yellow, all tarsi yellow; fore wings pale brown with a darker stripe; major body setae brown.

Head 1.5 times as long as wide ( Fig. 20 ), po setae blunt, behind eyes, almost as long as eye length; maxillary stylets retracted to between po setae and posterior margin of eyes, close together medially; antennal segment III 1.6 times as long as II, segment IV 1.4 times as long as II ( Fig. 27 ). Pronotum with 5 pairs of major setae, all blunt, am setae longer than aa setae ( Fig. 21 ); ml, epim and pa setae about same length; mesopresternum separated in middle ( Fig. 23 ); metanotum covered with hexagonal reticles medially ( Fig. 22 ); fore wing with 11–16 duplicated cilia. Pelta triangular ( Fig. 24 ) with pair of CPS; tergite II laterally with 2 accessary setae ( Fig. 25 ); tergites II–VII with 2 pairs of wing-retaining setae; tube straight-sided, shorter than head ( Fig. 26 ).

Male macroptera. Body length 2.1 mm on slide, colour and shape similar to female.

Measurements. (holotype in microns). Body length 2600. Head, median length 330; largest width 250; po setae 70; antennal segments (L/W) I 50/50, II 70/40, III 110/30, IV 100/40, V 90/40, VI 90/35, VII 70/25, VIII 40/20, total length 620. Pronotum median length 200; greatest width 450; am setae 55, aa setae 38; fore wing length 1250. Pelta, length 130; width 250. Tube length 250.

Specimens examined. Taiwan, female holotype, Dayuling (Nantou), grasses, 21.iv.1993. Paratypes, 1 female, 1 male, same data as holotype .

Etymology. This species is named after Dayulin, a ridgeline area of 2500–2600 m high in central Taiwan where the specimens were collected.

Comments. The form of the metanotal striae is different in this species from most Liothrips species. It is similar to L. floridensis but they can be distinguished by their colours and shape of the mesopresternum. The new species has antennal segments V and VI half yellow and half brown, and brownish fore wings, whereas L. floridensis has antennal segments V and VI yellow, and completely transparent fore wings. Moreover, the mesopresternum of dayulingensis is in two parts but in floridensis it is complete ( Fig. 32 ).

Figures

FIGURES 20–27. Liothrips dayulingensis sp.n.: (20) head; (21) pronotum; (22) metanotum; (23) mesopresternum; (24) pelta; (25) tergite II; (26) tube; (27) shape of antenna.

FIGURES 28–34. Liothrips floridensis: (28) head; (29) tergite II; (30) pronotum; (31) metanotum; (32) mesopresternum; (33) pelta; (34) shape of antenna.