Mycterothrips fasciatus Masumoto & Okajima, 2006

Masumoto, Masami & Okajima, Shûji, 2024, Further study of the genus Mycterothrips Trybom (Thysanoptera: Thripidae) in Japan, with description of a new species and a new record, Zootaxa 5489 (1), pp. 107-124 : 120

Mycterothrips fasciatus Masumoto & Okajima

( Figs 13 , 43–47 )

Mycterothrips fasciatus Masumoto & Okajima, 2006: 48 .

This species was described from the leaves of Illex spp. [ Aquifoliaceae ] but recently many females and males with several second instar larvae have been collected from Dendropanax trifidus [ Araliaceae ] in Honshu, Japan. Li & Zhang (2022) reported that M. fasciatus had variation in the number of anteocellar setae and CPS on female abdominal tergite IX in China. In contrast, in Japanese populations a pair of CPS on abdominal tergite IX of female is consistently present although single or paired vestigial CPS-like structures are very rarely present anteriorly, and ocellar setae I are sometimes not paired.

Second instar larva. Body creamy yellow ( Fig. 13 ), head weakly shaded gray anteromedially ( Fig. 44 ), abdominal tergite IX slightly shaded gray along posterior margin, shaded area reaching but not exceeding setal base, tergite X shaded gray at posterior third, shaded area exceeding setal base but not reaching CPS ( Fig. 46 ); antennal segment I pale, II shaded gray below setae, III shaded gray median half, IV–VII shaded gray ( Fig. 43 ); body setae pale. Head with D1 setae small and acute at apex, D2 and D4 setae expanded and multifid at apex, 2.4 and 2.3 times as long as D1 setae respectively, D3 setae shorter than D3 and D4 setae and acute at apex. Antennae 7-segmented, segment III with three and four rows of microtrichia on both dorsal and ventral surfaces, IV with five and six rows of microtrichia on dorsal and ventral surfaces, respectively. Thoracic nota with strong setae pointed or blunt at apex sternal setae slender and acute at apex; pronotum with longitudinal granules and large smooth areas at each side, meso- and metanota with more than 10 transverse rows of longitudinal granules; mesothoracic spiracle about 17.5 microns in major axis, with small peridrome and a posteromedian peridrome slightly larger than or subequal to spiracle opening in major axis ( Fig. 45 ). Abdominal tergites I–VIII throughout covered with longitudinal granules having minute microtrichia posteriorly, microtrichia conspicuous laterally; dorsal setae developed and pointed at apex but D2 setae on VII and D1–D2 setae blunt at apex, spiracles on II and VIII small; tergite IX with minute teeth along posterior margin and four or five transverse rows of longitudinal granules having minute microtrichia, interval of CPS slightly narrower than interval of D1 setae; tergite X with D1 setae weakly expanded apex and about 2.6 times as long as D2 setae blunt at apex; sternites covered with longitudinal granules except between V1 setae on sternites II to anterior half of VI ( Fig. 47 ), microtrichia more conspicuous than in tergites, smooth at posterior half of X, all ventral setae slender and acute at apex.

Specimens of second instar larvae examined. JAPAN, Honshu , Osaka-fu, Sennan-shi, 11 larvae collected together with 21 females and 11 males on leaf of Dendropanax trifidus [ Araliaceae ], 28.v.2017, K.Fujimoto. All specimens are deposited in TUA .

Comments. In second instar larvae of Mycterothrips , the dorsal setae on thorax and abdomen are usually stout, and expanded and multifid at apex (also see Vierbergen, et al., 2010) but most setae are pointed in this species. Abdominal sternites are uniquely smooth between V1 setae on anterior segments in contrast to other species ( Figs 33 , 49 ).

Figures

FIGURES 5–15. Mycterothrips species, slide-mounted specimens. Adult 5–11. M. albiziae sp. n.: (5) Female; (6) Male. M. auratus: (7) Female; (8) Male. M. glycines: (9) Female; (10) Female, dark type; (11) Male. Second instar larvae, 12–15: (12) M. albiziae, sp. n.; (13) M. fasciatus; (14) M. glycines; (15) M. japonicus.

FIGURES 43–49. Mycterothrips species, second instar larva. M. fasciatus, 43–47: (43) Antenna; (44) Head–mesonotum; (45) Anterior angle of mesonotum; (46) Abdominal tergites VII–XI: (47) Abdominal sternites III–VI. M. glycines, 48–49: (48) Head and pronotum; (49) Abdominal sternites IV–VI. spl=spiracle.

FIGURES 29–34. Mycterothrips albiziae sp. n., second instar larva:(29)Antenna; (30) Head–mesonotum; (31)Anterior angle of mesonotum. (32) Abdominal tergites VII–XI: (33) Abdominal sternites III–IV; (34) Abdominal sternites VIII–X. spl=spiracle.