Panchaetothripinae, Bagnall, 1912

Lima, Élison Fabrício B., O’Donnell, Cheryle A., Sousa, Yago Lucas C. & Zamar, María Inés, 2021, Identification of second instar larvae of Panchaetothripinae (Thysanoptera Thripidae) in Brazil and Argentina, Zootaxa 5047 (4), pp. 453-464 : 455

Key to second instar larvae of Panchaetothripinae in Brazil and Argentina

1. Abdominal segment X with 16–18 anal setae ( Fig. 41 ).......................................... Retithrips syriacus

-. Abdominal segment X with six anal setae ( Figs 35, 36, 42 ).................................................... 2

2. Major dorsal setae clavate, fringed or expanded distally....................................................... 3

-. Major dorsal setae more slender, acute or blunt.............................................................. 9

3. Dorsal setae strongly expanded distally (maximum width of setae at least 3x wider than at the base) ( Figs 15 , 20 )......... 4

-. Dorsal setae with apex different (if expanded, not remarkably broad)............................................ 5

4. Dorsal setae with concave (crateriform) apex ( Fig. 20 ); head with setae D1 inserted posteriorly to D4 setae, D3 with apex expanded......................................................................... Parthenothrips dracaenae

-. Dorsal setae with convex apex ( Fig. 15 ); head with setae D1 inserted anteriorly to D4 setae, D3 with apex acute............................................................................................. Bradinothrips musae

5. Abdominal segments IX and X brown, completely sclerotized ( Figs 36, 37 ) ( Dinurothrips )........................... 6

-. Abdominal segments IX and X clearer, not fully sclerotized ( Figs 38, 39 )........................................ 7

6. Abdominal segments IX 0.7–0.8x longer than wide; abdominal segment X 1.4–1.5x longer than basal width; posterior margin of segment X with teeth medially only, between D1 setae..................................... Dinurothrips hookeri

-. Abdominal segments IX 0.6x longer than wide; abdominal segment X 1.1–1.3x longer than basal width ( Fig. 37 ); posterior margin of segment X with minute teeth laterally only................................................ D. vezenyii

7. Dorsal setae emerging from tubercles and with weakly expanded apex (about 1.5x wider than basal quarter) ( Fig. 39 ).......................................................................................... Helionothrips errans

-. Dorsal setae not emerging from tubercles and with apex about 2x wider than basal quarter ( Caliothrips )................ 8

8. Setae on meso- and metanotum short, about 4x longer than setae basal width; apex strongly expanded, at least 3x wider than basal quarter width ( Fig. 22 )................................................................................................................................................................ Caliothrips phaseoli

-. Setae on meso- and metanotum, more than 10x longer than setae basal width; apex less expanded, 2x wider than basal quarter width ( Fig. 21 )....................................................................... Caliothrips insularis

9. Setae on antennal segment III longer than the segment length ( Fig. 6 )............................................................................................................................ Brachyurothrips anomalus

-. Setae on antennal segment III as long as or shorter than the segment length ( Figs 7–14 )............................. 10

Figures

FIGURES 22–42. Panchaetothripinae second instar larvae. (22) Caliothrips phaseoli meso- and metanotum. (23) Heliothrips zucchi (leg). Spiracle 24–34: (24) Brachyurpthrips anomalus (tergite VIII); (25) Caliothrips phaseoli (mesonotum); (26) Dinurothrips hookeri (mesonotum); (27) Dinurothrips hookeri (tergite VIII); (28) Helionothrips errans (mesonotum); (29) Helionothrips errans (tergite VIII); (30) Elixothrips brevisetis (mesonotum); (31) Heliothrips haemorrhoidalis (mesonotum); (32) Hercinothrips bicinctus (mesonotum); (33) Hercinothrips bicinctus (tergite II); (34) Retithrips syriacus (mesonotum). Abdominal tergites 35–42: (35) Brachyurothrips anomalus (IX–X); (36) Dinurothrips hookeri (VIII–X); (37) Dinurothrips vezenyii (IX-X), (38) Hercinothrips bicinctus (VIII–X); (39) Helionothrips errans (III–X); (40) Hercinothrips femoralis (VIII–X); (41) Retithrips syriacus (IX–X); (42) Selenothrips rubrocinctus (VI–X).

FIGURES 1–15. Panchaetothripinae second instar larvae (except where noted). Alive individuals 1–4: (1) Dinurothrips hookeri; (2) Dinurothrips vezenyii; (3) Helionothrips errans; (4) Retithrips syriacus; (5) Selenothrips rubrocinctus (adults and pupae). Antenna 6–14: (6) Brachyurothrips anomalus; (7) Bradinothrips musae; (8) Caliothrips insularis; (9) Caliothrips phaseoli; (10) Dinurothrips hookeri; (11) Elixothrips brevisetis; (12) Heliothrips haemorrhoidalis; (13) Heliothrips longisensibilis; (14) Heliothrips zucchi. (15) Bradinothrips musae head and pronotum.

FIGURES 16–21. Panchaetothripinae second instar larvae. Head and pronotum 16–20: (16) Caliothrips phaseoli; (17) Dinurothrips hookeri; (18) Heliothrips haemorrhoidalis; (19) Hoodothrips lineatus; (20) Parthenothrips dracaenae. (21) Caliothrips insularis meso- and metanotum.