Parascirtothrips fagaceae, Masumoto, Masami & Okajima, Shûji, 2007

Masumoto, Masami & Okajima, Shûji, 2007, The genus Scirtothrips Shull (Insecta, Thysanoptera, Thripidae) and three related genera in Japan, Zootaxa 1552, pp. 1-33 : 14-16

Parascirtothrips fagaceae n. sp.

( Figs. 6–8 )

Female. Distended body length 1.0– 1.2 mm. Body yellowish brown or orange brown, head shaded within ocellar triangle and apex of frons, abdominal sterna III to VIII with antecostal ridges dark; antennal segment I pale brown, II to IV pale brown, IV slightly darker than III, V to VII brown; fore wings uniformly shaded; all legs pale brown; prominent body setae shaded.

Head 1.5–1.9 times as wide as long, slightly prolonged forwardly. Ocellar setae III situated at middle between fore ocellus and hind ocelli ( Fig.6 A). Postocular setae I in front of setal row and almost as long as or slightly longer than ocellar setae III, remaining setae subequal in length and arranged almost transversely. Antennae 7-segmented, segment III the longest, with pedicel having slightly expanded ring, IV and V slightly pedicelate, VI straight each side basal half and tapering forwardly ( Figs. 6 B–C). Antennal segments I to VII length/width ratio as follows: 0.8–0.9, 1.1–1.4, 2.0–2.6, 1.7–2.0, 1.9–2.1, 2.3–2.7, 2.0–2.8.

Pronotum 1.5–2.4 times as wide as long, space between lines of sculpture wider than diameter of socket of discal setae, with 17 discal setae (including anteromarginals and lateralmarginals) (16 in the holotype); posteromarginal B2 setae 0.2–0.4 times as long as pronotal median length and 1.5–2.2 times as long as B1 setae ( Fig. 6 A). Mesonotum without CPS anteromedially (6D). Metascutum sculptured transversely medially; median pair of setae situated behind anterior margin ( Fig. 6 D). Fore wings with 21–27 setae on costal vein (24 on left, 22 on right, in the holotype), with five to eight basal and three to four distal setae on first vein (four and two on left, five and three on right, in the holotype).

Abdominal terga II to VIII with wide spaced transverse anastomosing lines of sculpture laterally, lines not extending mesad of B2 setae, small irregular microtrichia often present along lines of sculpture and slightly large on posterior terga ( Figs. 7 B & 8A); terga II to VII with small posteromarginal microtrichia outside of B2 setae ( Fig. 8 A); terga III to VII with four or five setae on lateral sculptured fields ( Fig. 8 A); tergum VIII with some small microtrichia along lines of sculpture at each side ( Fig. 7 B); tergum IX without microtrichia ( Fig. 7 B), B1 setae, B2 setae and B3 setae each 0.6–0.7 times, 0.7–0.8 times and 0.6–0.7 times as long as median length of the tergum; tergum X with B1 setae and B2 setae each 1.2–1.5 times and 1.0–1.3 times as long as median length of the tergum; sternum VII with B1 setae at posterior margin ( Fig. 8 B). Ovipositor 2.0–3.2 times as long as pronotal median length.

Measurements of holotype female in microns. Distended body length 1130. Head length 76, width across cheeks 134; compound dorsal length 55, width 40. Pronotal median length 100, width 155; posteromarginal setae I length 15, setae II length 25–29. Metascutal median length 65, median setae length 18–20. Fore wings length 610, width at middle 40. Abdominal tergum IX median length 83; B1 setae length 55–58, B2 setae length 65, B3 setae length 58–61, mid-dorsal setae length 33–38; tergum X median length 45, B1 setae length 56–60, B2 setae length 53–55. Ovipositor length 210. Antennal segments I to VIII length (width) as follows: 23(25), 30 (28), 45 (21), 35 (18), 38 (18), 44 (18), 19 (8).

Male. Unknown.

Type series. Holotype female: Japan, Honshu, Kanagawa Pref., Yokosuka City, Kannonzaki, on leaves of Lithocarpus edulis [ Fagaceae ], 5-vi-2005, M. Masumoto. Paratypes: 7 females collected together with the holotype, 5-vi-2005, M. Masumoto. 1 female, same locality and date as the holotype, on leaves of Castanopsis sieboldii [ Fagaceae ], M. Masumoto. 1 female, same locality as the holotype, on leaves of Aucuba japonica [ Cornaceae ], 28-vi-2005, M. Masumoto. 1 female, same locality as the holotype, on leaves of Machilus thunbergii [ Lauraceae ], 28-vi-2005, M. Masumoto. 3 females, same locality as the holotype, on leaves of Castanopsis sieboldii , 14-v-2006, M. Masumoto. 1 female, same locality as the holotype, on leaves of Myrica rubra [ Myricaceae ], 14-v-2006, M. Masumoto. 1 female, same locality as the holotype, on leaves of Myrica rubra , 21-v-2006, M. Masumoto. 4 females, same locality and host plant as the holotype, 21-v-2006, M. Masumoto. 6 females, Kanagawa Pref., Hayama-cho, Mt. Futago-yama, on leaves of Castanopsis sieboldii , 15-v-2005, M. Masumoto. The holotype and most paratypes are deposited in Laboratory of Entomology, TUA, Atsugi, Japan.

Etymology. In reference to the host plant of the species.

Figures

FIGURE 6. Parascirtothrips fagaceae n. gen. et sp. (female). (A) Head & pronotum; (B) Antenna (right) (holotype); (C) Antennal segments I – II (holotype); (D) Mesonotum & metascutum.

FIGURE 7. Parascirtothrips fagaceae n. gen. et sp. (female). (A) Ventral aspect of thorax; (B) Abdominal terga VIII – XI.

FIGURE 8. Parascirtothrips fagaceae n. gen. et sp. (female). (A) Tergum V, left side; (B) Sternum VII (sculpture omitted on right side.).