Sericothripinae, Karny, 1921

Rasool, Iftekhar, Soliman, Ahmed M., Alattal, Yehya Zaki & Al Dhafer, Hathal M., 2021, The Thripidae subfamily Sericothripinae (Thysanoptera) from Saudi Arabia with a new species of Hydatothrips Karny, Zootaxa 4908 (1), pp. 29-40 : 30

Key to the genera and species of Sericothripinae from Saudi Arabia

1. Metasternal plate anterior margin with deep U- or V-shape invagination medially ( Figs 2 , 9 )............. Hydatothrips ... 2

- Metasternal plate anterior margin either transverse ( Fig. 19 ) or with shallow emargination medially ( Fig. 26 )................................................................................................. Neohydatothrips ... 3

2. Ocellar triangle closely striated ( Fig. 1 ); metanotum longitudinally striate ( Fig. 3 ); setal pair S3 on abdominal tergites IV–VI at posterior margin, with only three setae anterior to S3 ( Fig. 4 ); tergite IX with three pairs of mid-dorsal setae ( Fig. 5 ); abdominal segments IV–V yellow ( Fig. 32 )............................................................. H. adolfifriderici

- Ocellar triangle with widely spaced striae ( Fig. 8 ); metanotum longitudinally reticulate ( Fig. 10 ); setae S3 on abdominal tergites IV–VI placed far ahead of posterior margin, with 6–8 setae anterior to S3 ( Fig. 11 ); tergite IX with two pairs of mid-dorsal setae ( Fig. 13 ); abdominal segments reddish brown ( Fig. 34 )......................................... H. bahaensis sp. n.

3. Occipital apodeme confluent with posterior margin of compound eyes ( Fig. 16 ), ocellar setae pair III arising at external margin of triangle and shorter than distance between their bases; metasternal plate with anterior margin transverse ( Fig. 19 ); sternites without discal microtrichia or posteromarginal comb ( Fig. 20 ); tergite IX with only one pair of mid-dorsal setae ( Fig. 21 ); abdominal segments I–VI unicolor pale yellow to white, without trace of shadings ( Figs 36, 37 )................ N. amygdali

- Occipital apodeme widely spaced from posterior margin of compound eyes ( Fig. 25 ), ocellar setae pair III arising inside the triangle and longer than distance between their bases; metasternal plate with anterior margin shallowly invaginated ( Fig. 26 ); sternites with discal microtrichia and III–VI with postero-marginal comb ( Fig. 29 ); tergite IX with two pairs of mid-dorsal setae ( Fig. 30 ); abdominal segments largely brown, except tergites IV–V yellow medially ( Fig. 38 ).............. N. samayunkur

Figures

FIGURES 1–7. Hydatothrips adolfifriderici female. (1) Head and pronotum; (2) Metasternal plate; (3) Meso- and metanotum; (4) Tergites IV–VI; (5) Tergites VII–X; (6) Sternites IV–VI; (7) Fore wing.

FIGURES 8–14. Hydatothrips bahaensis sp. n. female. (8) Head and pronotum; (9) Metasternal plate; (10) Meso- and metanotum; (11) Tergites IV–VI; (12) Sternites IV–VI; (13) Tergites VII–X; (14) Fore wing.

FIGURES 16–24. Neohydatothrips amygdali female. (16) Head and pronotum; (17) Meso- and metanotum; (18) Tergites III–VI (19) Metasternal plate; (20) Sternites III–VI; (21) Tergites VII–X; (22) Male tergites VII–X; (23) Larval tergites; (24) Fore wing.

FIGURES 25–31. Neohydatothrips samayunkur female. (25) Head and pronotum; (26) Metasternal plate; (27) Tergites IV–VI; (28) Meso- and metanotum; (29) Sternites III–VI; (30) Tergites VII–X; (31) Fore wing.

FIGURES 32–35. Adult habitus of Hydatothrips spp.: (32, 33) adolfifriderici (Female and male respectively); (34, 35) bahaensis sp. n. (Female and male respectively).

FIGURES 36–40. Adult and larval Sericothripinae: (36, 37) N. amygdali (Female and male respectively); (38) N. samayunkur (Female). (39) H. bahaensis sp. n. larva. (40) N. amygdali larva.