Neurisothrips bidens, Mound, 2020

Mound, Laurence A., 2020, Diversity in the Hawaiian endemic genus Neurisothrips (Thysanoptera, Thripidae), Zootaxa 4779 (2), pp. 215-229 : 218-219

Neurisothrips bidens sp. n.

( Figs 2 , 19 , 25, 32 )

Female. Body and legs yellow, fore wings lightly shaded, major setae dark; antennal segment I as pale as head, II washed with light brown, III–VII brown but III paler on basal half and IV with pedicel paler. With the character states of the genus: antennal segments III and IV weakly constricted to short apical neck ( Fig. 2 ); head with ocellar setae III and po IV not particularly long, po setae pair I present; mouth cone extending to fore coxae; pronotum with 2 pairs of anteromarginal setae and one pair of anteroangular setae; discal area apparently unsculptured, with about 20 setae ( Fig. 19 ); posterior margin with 3 pairs, median pair no more than 1.5 times as long as submedian pairs, posteroangular setae long. Metanotal sculpture weak medially. Tergites III–VIII with no sculpture mesad of setal pair S1, reticulate sculpture lines weak on lateral areas; IV and V each with 5 to 7 discal setae laterally; X with longitudinal split not fully complete. Sternites with irregular transverse row of about 10 discal setae ( Fig. 32 ).

Measurements (holotype female in microns). Body length 1400. Head, length 110; width across eyes 150; ocellar setae III 45; po setae IV 40. Pronotum, length 130; width 200; pm setae S1 25; pa setae 60. Metanotum median setae length 65. Fore wing length 880. Antennal segments III–VII length 45, 50, 35, 45, 20.

Male. Similar in colour and chaetotaxy to female; 2 pairs of setae on tergite IX arranged in almost straight transverse line; sternites III–VII each with large pore plate, discal setae present only lateral to pore plate ( Fig. 25 ).

Measurements (paratype male in microns). Body length 930. Head, length 95; width across eyes 130; ocellar setae III 40; po setae IV 35. Pronotal pa setae 50.

Specimens examined. Holotype female, Oahu, Lanipo Trail (21° 18’N, - 157° 46’W), from Bidens fls, 24.v.1946 (K.Sakimura).

Paratypes: 1 female, 2 males taken with holotype; Oahu, Waimano Trail, 2 females from Bidens asymmetrica flowers, 13.v.1945.

Comments. The holotype is the female with the dorsal side uppermost, mounted on the same slide as a paratype female that is mounted ventral side uppermost. This paratype female is considerably smaller, with the body length scarcely 1200 microns. This species is one of only two known Neurisothrips species to have sternal discal setae. It is closely similar to janis sp. n. in colour but is slightly larger with longer and darker major setae. In the male, the sternal discal setae are present only lateral to the large pore plate ( Fig. 25 ). The Asteraceae genus Bidens includes widespread pest species, but on Oahu there are several endemic Bidens species that presumably provide the hosts for this thrips species.

Figures

FIGURES 1–14. Neurisothrips species.Antennae 1–8: (1) antennatus; (2) bidens sp. n.; (3) janis sp. n.; (4) dubautiae; (5) karl sp. n.; (6) fran sp. n.; (7) robbiei sp. n.; (8) tsuda sp. n. Fore wing colour 9–10: (9) fullawayi; (10) saki sp. n. Head 11–14: (11) antennatus; (12) fasciatus; (13) multispinus; (14) saki sp. n.

FIGURES 15–23. Neurisothrips species. Head & pronotum 15–16: (15) antennatus; (16) robbiei sp. n. Head & thorax 17–18: (17) tsuda sp. n.; (18) fran sp. n. Pronotum 19–20: (19) bidens sp. n.; (20) karl sp. n. (21) saki sp. n. pronotum & metanotum. Female tergites VI–X: (22) karl sp. n.; (23) robbiei sp. n.

FIGURES 24–32. Neurisothrips species. Male sternal pore plates 24–29: (24) antennatus; (25) bidens sp. n.; (26) fran sp. n.; (27) karl sp. n.; (28) robbiei sp. n. [from Santalum]; (29) robbiei sp. n. [from Psychotria]; (30) saki sp. n.. Female sternites 31–32: (31) janis sp. n.; (32) bidens sp. n.