Odontothrips kudoi, Masumoto & Okajima, 2021

Masumoto, Masami & Okajima, Shûji, 2021, A new species of Odontothrips Amyot & Serville (Thysanoptera, Thripidae) from Japan, Zootaxa 4942 (1), pp. 109-117 : 112-113

Odontothrips kudoi sp. n.

( Figs 3, 4 , 11–15 , 17–20 )

Odontothrips loti (Haliday, 1852) ; Kudo, 1972. [misidentification]

Female macroptera. Distended body length 1.7–2.0 mm. Body uniformly dark brown ( Fig. 3 ); antennal segments I–II dark brown, III yellow, IV–VIII dark brown; fore wings brown with subbasal area pale and subdistal area often slightly pale, clavus pale with base shaded; all femora dark brown, fore tibiae yellowish brown, mid and hind tibiae dark brown, all tarsi yellow or brownish yellow; prominent body setae dark brown. Head 0.8–1.0 times as long as wide, sculptured with transverse anastomosing striae dorsally, almost smooth within ocellar triangle, weakly concave at middle of cheeks ( Fig. 11 ). Ocellar setae III at middle of anterior margin of ocellar triangle and 2.4–3.3 times as long as interval. Postocular setae II and IV slightly longer than remaining setae, setae IV usually slightly behind setal row. Antennal segment II without microtrichia, III straight at each side and usually longest, often subequal to VI, IV slightly rounded at each side, III and IV widest at distal fourth and with short apical neck, IV pedicelate, V weakly pedicelate, basal width of inner sense-cone on VI about 0.4 times as long as length of segment ( Fig. 12 ). Antennal segments I–VIII length/width ratio as follows: 0.9–1.1, 1.2–1.4, 2.3–2.8, 2.0–2.4, 1.8–2.1, 2.3–2.5, 0.9–1.1, 2.3–2.7. Pronotum 0.8–0.9 times as long as wide, almost smooth medially, with 9–13 discal short setae medially, 7–16 microns long; posteroangular setae I 0.5–0.6 times as long as pronotal median length and slightly longer than setae II; posteromarginal setae I 0.1–0.2 times as long as pronotal median length and twice as long as remaining setae. Mesonotum almost smooth anterior to anteromedian CPS. Metascutum with median reticulations weak and median pair of setae 0.8–1.0 times as long as metascutal median length ( Fig. 13 ). Fore tibiae with a large ventral apical claw and a stout inner apical seta ventrally; fore tarsi II without tubercle ( Figs 14, 15 ); hind tibiae 193–225 microns long. Fore wing costal vein with 25–29 setae, first vein with 15–21 setae and small gap (1 seta) of setal row near apex, second vein with 14–20 setae. Abdominal tergite I with transverse anastomosing striae throughout, tergites II–VIII laterally with transverse anastomosing lines striae, no lines reaching S1 setae on IV–VII ( Fig. 17 ); tergites VI–VIII with S4 setae reduced to minute; tergite IX with both anterior and posterior pairs of CPS ( Fig. 18 ); sternite VII with S1 setae in front of posterior margin. Ovipositor 1.8–2.1 times as long as pronotal median length.

Measurements (holotype female in microns). Distended body length 1840. Head length 132, width across cheeks 150; compound eyes dorsal length 74, width 45. Ocellar setae III length 79–81, interval 28. Pronotal median length 163, width 200; posteroangular setae I length 84–87, setae II length 63–67, posteromarginal setae I length 25–28, discal setae length 13–15. Metascutal median length 80, median setae length 69–70; hind tibiae length 205. Fore wing length 890, width at middle 60. Ovipositor length 300. Antennal segments I–VIII length (wide) as follows: 33 (35), 39 (28), 59 (23), 58 (24), 39 (20), 58 (24), 9 (10), 18 (8).

Male macroptera. Distended body length 1.3–1.5 mm. Body colour almost same as female, but fore wings pale at subdistal area and antennal segment II much paler than I ( Fig. 4 ). Abdominal tergite IX with posterior margin eroded, S1 setae near posterior margin and closed to S2 setae, S2 setae 2–3 times as long as long as S1 and S3 setae, posteroangular setae small spine-like at posterior margin; a pair of canaliculi developed, 2–4 stout endothecal spines present at apical areas of each canaliculus ( Fig. 19 ); sternites IV-VII each with a minute glandular opening.

Measurements (paratype males in microns). Distended body length 1380–1480. Head length 110–128, width across cheeks 138–150; compound eyes dorsal length 65–73, width 40–45. Ocellar setae III length 62–85, interval 2.7–3.8. Pronotal median length 140–163, width 175–205, posteroangular setae I length 60–79, setae II length55– 68, posteromarginal setae I length 20–40. Metascutal median length 73–78, median setae length 50–70. Fore wing length 770–880, width at middle 45–60. Antennal segments I–VIII length (wide) as follows: 30–33 (31–33), 30–45 (25–26), 50–60 (23–25), 48–58 (23–25), 35–38 (20), 50–55 (23), 9 (9–10), 15 (8).

Type series. Holotype female, Japan, Hokkaido, Abashiri City, Misaki, on flowers of Lespedeza cyrtobotrya [ Fabaceae ], 11.viii.2006, T. Nonaka. Paratypes: Hokkaido, 5 females, collected together with holotype. 8 females, same locality as the holotype, on flowers of Lespedeza bicolor , 7.viii.2007, T. Nonaka. Honshu, Gunma-ken, Katashina-mura (alt. about 1500m), 4 females on Lespedeza sp., 24.viii.2014, M. Masumoto. Nagano-ken, Yamanouchi-machi (alt. about 1600m), 1 male on Lespedeza bicolor , 13.viii.2016, M. Masumoto. Yamanashi-ken: Hokuto-shi, Sutama-cho, Kanayama-daira, 2 females & 2 males on Lespedeza bicolor , 3.viii.2006, S. Okajima. Hokutoshi, near Tokusa-toge, 1 female on flowers of Lespedeza sp., 22.viii.2006, M. Masumoto. Non-paratypic specimens: Hokkaido, Sapporo-shi, Tsukisappu, 1 female on Lespedeza bicolor , 16.viii.1978, I. Kudo ( KDC). Okoppe, 1 male on Lespedeza bicolor , 9.viii.1976, I. Kudo ( KDC). The holotype and most paratypes are deposited in TUA.

Comments. O. kudoi is very similar to O. loti in fore wing coloration, fore wing chaetotaxy, and fore tibiae with a large apical claw. It can be distinguished from O. loti by the following character states: fore tarsal segment II without inner tubercles, antennal segment IV as dark as V and male with 2–4 endothecal spines on each canaliculus, whereas in O. loti fore tarsal segment II bears 1–2 small inner tubercles, antennal segment IV is paler than V and the male has only a single endothecal spine at apex of each canaliculus ( Figs 16 & 21 ). O. viciae Priesner from Israel is similar to this new species by having fore tibia with 1 stout apical claw but fore tarsal segment II without tubercle but it has a curved apical claw on the fore tarsus. O. meridionalis Priesner and O. ononidis Bagnall from Europe are also slightly similar to this new species by having a few endothecal spines on the apical area of each canaliculus and tergite IX with S2 setae much longer than S1 and S3 setae in male, but they are distinguishable as follows: in O. meridionalis , fore tarsal segment II with 2 small tubercles, fore tibiae with a small apical claw and 1 small tubercle bearing 1 seta, pronotum sculptured medially, abdominal tergites IV–VII with sculpture reaching S1 setae and male tergite IX with S1 setae very short and stout; in O. ononidis , fore tarsal segment II with small tubercles, fore tibiae with a small apical claw and 1 small tubercle bearing 1 seta, pronotal discal setae long (18–23 micron) and many (about 20 setae medially) (zur Strassen 2003).

Kudo (1970) recorded several females of a thrips from Trifolium pratense and Vicia cracca as Taeniothrips ref. distalis but a text figure indicating the antenna in the paper ( Fig. 13 in p454) distinctly shows Odontothrips . Thereafter, Kudo (1972) recorded many individuals of both sexes of Odontothrips species as loti from Lespedeza cyrtobotrya at Yamanashi and revised a record of Hokkaido to O. loti . However, Kudo (1970) stated that the fore wing of T. ref. distalis was “dark brown with a white cross band, hyaline about one-eighth of length at middle”. This fore wing coloration is different from loti , and a female and a male from Hokkaido studied here which were identified as O. loti by Iwao Kudo are identical to O. kudoi . Moreover, Kudo (1972) did not refer to “fore tarsal tubercle” and “endothecal spine” and a text figure indicating fore leg in Kudo (1970, Fig. 15 in p454) does not include a “tarsal tubercle”. Several females and males which are type series of kudoi were collected from same or near locality in which Kudo (1970, 1972) recorded loti and also identical to specimens which from Hokkaido identified as loti by Kudo. Thus, we considered that the previous records of O. loti from Japan were not true loti .

O. loti breeds in various species of Fabaceae such as Anthyllis , Coronilla , Genista , Lotus , Ononis and Trifolium ( Mound et al. 2018) . In contrast, O. kudoi apparently breeds mainly on Lespedeza which is apparently unusual as a host plant of Odontothrips . Lespedeza is distributed in two disjunct areas, Asia to Australia and eastern North America ( Nemoto et al. 2009, Ohashi et al. 2009) and is not native in the main distribution area of O. loti . In Japan, O. kudoi seems to be widespread in the northern part or mountainous area, whereas O. biuncus is known so far from the northern half of Hokkaido.

Figures

FIGURES 1–4. Odontothrips species. O. biuncus, 1–2: (1) Female; (2) Male. O. kudoi sp. n. 3–4: (3) Female; (4) Male.

FIGURES 11–16. Odontothrips species. O. kudoi sp. n., female, 11–15: (11) Head & pronotum; (12) Antenna; (13) Metascutum; (14) Right fore tibia & tarsus (dorsally); (15) Right fore tibia & tarsus (ventrally). (16) O. loti, female, right fore tibia & tarsus (ventrally) (from England deposited in NHM).

FIGURES 17–21. Odontothrips species, abdominal segments. O. kudoi sp. n., 17–19: (17) Tergite V, female; (18) Tergites VIII–X, female; (19) Tergite IX & endothecal spines, male; (20) Sternite IV, male, go=glandular opening; (21) O. loti, male, tergite IX & endothecal spines (from England deposited in NHM).