Hydatothrips Karny, 1913

Rachana, R. R., Amarendra, B. & Gracy, R. Gandhi, 2022, The Sericothripinae genus Hydatothrips (Thysanoptera, Thripidae) in India with description of a new species, Zootaxa 5169 (2), pp. 177-182 : 178

Hydatothrips Karny

The members of this genus are predominantly bicoloured. They can be distinguished from other genera of Sericothripinae by the available keys ( Lima & Mound 2016a & b). Hydatothrips is characterized by the anterior margin of the metasternal plate with deep U- or V-shaped invagination. In 2007, Wang provided an identification key to Hydatothrips species from East and South Asia which was apparently based largely on the data from published literature. According to the Wang’s key, H. dorax has 4–5 setae on the second vein. However, the original description states that dorax has 1–2 setae on second vein but 4–5 setae on the clavus.

Key to Hydatothrips species from India

[*based on original description.]

1. Fore wing with a sub-apical lobe extending beyond apical seta base ( Fig. 1 )................................ haschemi *

-. Fore wing with no sub-apical lobe, apical seta arises at apex of wing............................................. 2

2. Abdominal tergites IV–VI with S3 seta inserted at posterior margin............................................. 3

-. Abdominal tergites IV–VI with S3 seta inserted ahead of posterior margin........................................ 8

3. Fore wing second vein with setae......................................................................... 4

-. Fore wing second vein without setae...................................................................... 5

4. Fore wing first vein setal row continuous; second vein with 1–2 setae; clavus with 4–5 +1 setae, clavus terminal seta at apex............................................................................................... dorax *

- Fore wing first vein setae interrupted; second vein with 1 seta; clavus with 2+1 setae, clavus terminal seta well behind apex....................................................................................... ananthakrishnani *

5. Abdominal sternites II–VI medially with microtrichia, and posterior margin with complete comb; pronotal posteromarginal seta S2 very stout................................................................................... atactus *

-. Abdominal sternites II–VI medially without microtrichia, posterior margin without a comb; pronotal posteromarginal seta S2 normal.............................................................................................. 6

6. Pronotum in front of blotch polygonally reticulate between median pair of anteromarginal setae ( Fig. 4 )............ aureus

-. Pronotum in front of blotch transversely reticulate between median pair of anteromarginal setae ( Fig. 3 )................ 7

7. Anterior angles of pronotum acute, projected forward ( Fig. 3 ); abdominal segment X with microtrichia ( Fig. 2 ).................................................................................................... ramaswamiahi

-. Anterior angles of pronotum blunt; abdominal segment X without microtrichia............................. proximus

8. Pronotum without blotch, with a strong transverse apodeme across middle; median setal pair on abdominal tergites I–V reduced; abdominal sternites II–VI with marginal setae inserted in front of posterior margin..................... hartwigi *

-. Pronotum with demarcated blotch; median setal pair on abdominal tergites I–V well developed; abdominal sternites II–VI with marginal setae inserted at posterior margin................................................................. 9

9. Ocellar setae pair III arising on tangent between outer margins of fore and hind ocelli; abdominal tergites IV–VI with 6–9 setae lateral to S3................................................................................ boerhaaviae *

-. Ocellar setae pair III arising inside ocellar triangle; abdominal tergites IV–VI with 2–3 setae lateral to S3 ( Figs 15, 18 &19 )........................................................................................... initium sp.n.

Figures

FIGURES 1–4. Hydatothrips aureus, H. haschemi & H. ramaswamiahi. (1) Fore wing apex of H. haschemi (image by Laurence Mound); (2) Abdominal tergites IX–X of H. ramaswamiahi; (3) Pronotum of H. ramaswamiahi; (4) Polygonally reticulated pronotal area of H. aureus.

FIGURES 13–19. Hydatothrips initium sp.n. (13) Female abdominal tergites IX–X; (14) Abdominal tergite III; (15) Abdominal tergite VI; (16) Pore plate on male abdominal sternites VI–VII; (17) Abdominal tergite VIII; (18) Abdominal tergite V; (19) Abdominal tergite IV.