Scirtothrips Shull

Masumoto, Masami & Okajima, Shûji, 2007, The genus Scirtothrips Shull (Insecta, Thysanoptera, Thripidae) and three related genera in Japan, Zootaxa 1552, pp. 1-33 : 16-18

Scirtothrips Shull

Scirtothrips Shull, 1909: 222 . Type species: Scirtothrips ruthveni Shull, 1909 , by original designation and monotypy. Labiothrips Bhatti & Mound, 1994: 162 . Type species: Labiothrips tenor Mound & Bhatti, 1994 , by original designation and monotypy. [Synonymized by Hoddle & Mound, 2003: 7 .]

Female. Macropterous. Head wider than long, distinctly sculptured with narrow spaced transverse striae, with interantennal projection broad and about 0.5 times as wide as width of first antennal segment (cf. Fig. 9 ); mouth-cone rarely much elongate and reaching at mesothorax, with 3-segmented maxillary palpi. Compound eyes bulged, sometime with pigmented ommatidia. Ocellar setae I present; setae III short and variable in position (cf. Fig. 9 ). Postocular setae one to four or five pairs. Antennae 8-segmented (7-segmented in S. casuarinae Mound & Palmer of Australia and New Zealand); segment I without dorsal apical setae, II with an inner dorsal apical setae much longer than outer seta, four to seven rows of microtrichia on dorsal surface, III and IV with sense-cones forked, III to VI with three to seven rows microtrichia on both dorsal and ventral surfaces (cf. Fig. 11 B), number of setae of II to VI as follows: 6 or 7, 4, 5, 6, 9.

Pronotum distinctly sculptured with narrow-spaced transverse striae throughout; usually four (rarely five) pairs of posteromarginal setae, B2 setae longest, but no long posteroangular setae (cf. Fig. 9 ). Mesonotum distinctly sculptured with transverse striae; median pair of setae situated far form posterior margin and much anterior to submedian setae ( Fig. 12 D). Metascutum reticulated in variable shape medially; median pair of setae situated at or behind anterior margin; CPS absent (cf. Fig. 12 D). Metaepimeron with two setae. Metaepisternum without setae. Metapreepisternum developed with one seta. Prosternal ferna barely divided at middle; basantra membranous, without setae ( Fig. 18 A). Mesosternum with sternopleural suture weak, but complete, reaching at anterior margin; endofurca with spinula; spinasternum narrow and curved posteriorly at middle ( Fig. 18 A). Metasternal endofurca with spinula ( Fig. 18 A). Fore wing first vein with setal row arranged in not complete, variable spaced; second vein with one to eight setae, number of setae often variable in same species; clavus with three or four veinal and one discal setae; posteromarginal fringe cilia wavy or straight. Tarsi 2-segmented.

Abdominal terga without ctenidia and posteromarginal craspeda, not clearly divided from laterotergites, B1 setae variable in position, close to or wide apart each other ( Figs. 13 C, E & 14 A–B), if B1 setae close to each other distance between them progressively wide apart toward posterior segments; terga II to VIII laterally covered with dense numerous ciliate microtrichia arising from lines of sculpture, microtrichial fields of each side with three to five discal setae, posteromarginal microtrichia present at each side of terga II to VII (cf. Figs. 13 E–D); tergum VIII with posteromarginal comb complete, long and fine (cf. Fig. 15 ); tergum IX without CPS (cf. Fig. 15 ); X without median slit (cf. Fig. 15 ); sterna with numerous ciliate microtrichial rows at least laterally, without discal setae and posteromarginal craspeda ( Fig. 17 ); sterna III to VII with three pairs of posteromarginal setae ( Fig. 17 ), but II with two pairs. Ovipositor developed.

Male. Macropterous. General structure as in female. Abdominal tergum IX often with a pair of ventro-lateral horn-like processes (=drepanae) curved toward dorsum ( Fig. 18 C); sterna without glandular area.

Figures

FIGURE 9. Scirtothrips species, head & pronotum (female). (A) S. albidus n. sp.; (B) S. dorsalis.

FIGURE 11. Scirtothrips species (female). (A) S. machili n. sp., Head & pronotum; B – C, Antenna: (B) S. albidus n. sp.; (C) S. dorsalis.

FIGURE 12. Scirtothrips species (female). A – C, Antenna: (A) S. flavus n. sp.; (B) S. katsura n. sp.; (C) S. machili n. sp., (D) S. albidus n. sp., mesonotum & metascutum. E – F, Metascutum: (E) S. dorsalis; (F) S. flavus n. sp.

FIGURE 13. Scirtothrips species (female). A – B, Metascutum: (A) S. katsura n. sp.; (B) S. machili n. sp. C – E, Abdominal terga: (C) S. albidus n. sp., tergum VI (microtrichial row omitted on left side); (D) S. albidus n. sp., tergum VII (microtrichial row omitted on left side); (E) S. dorsalis, left side of tergum VI (microtrichial row omitted.).

FIGURE 15. Scirtothrips species, terminal abdominal terga (female). (A) S. albidus n. sp., terga VIII – X (microtrichial row omitted on left side of tergum VIII); (B) S. flavus n. sp., terga VIII – XI (microtrichial row omitted on left side of tergum VIII).

FIGURE 17. Scirtothrips species, abdominal sternum (female). (A) S. albidus n. sp., sternum VII; (B) S. dorsalis, sternum VI (microtrichial row omitted on left side.); (C) S. flavus n. sp., right side of sternum VI; (D) S. katsura n. sp., sternum VI (microtrichial row omitted on left side.); (E) S. machili n. sp. sternum V (microtrichial row omitted on left side.).

FIGURE 18. Scirtothrips species. (A) S. machili n. sp., Female (ventral aspect of thorax). B – D, Male abdominal terga: (B) S. dorsalis, tergum IX; (C) S. katsura n. sp., tergum IX (sculpture omitted.); (D) S. machili n. sp., terga IX – X (sculpture omitted.).