Protoribates crassisetiger nipponicus ( Fujita, 1989 )

Chen, Shujing Xu Yannan & Chen, Jun, 2020, New species and records of oribatid mites of the genus Protoribates (Acari Oribatida, Haplozetidae) from China, Zootaxa 4772 (3), pp. 469-511 : 488-490

Protoribates crassisetiger nipponicus ( Fujita, 1989)

( Figs 13–14 )

Xylobates crassisetiger nipponicus Fujita, 1989: 17–19 , fig. 1.

Protoribates (Protoribates) crassisetiger nipponicus ( Fujita, 1989) : Subías, 2004: 206.

Supplementary description. Body length 400–480, width 340–390. Body color brown. Body surface punctate. Prodorsum.

Rostrum broadly rounded. Lamellae located dorsolaterally, half as long as prodorsum. Rostral (48–52) and

interlamellar (87–92) setae setiform, barbed. Lamellar setae (71-84), setiform, thickened and barbed, inserted on lamellar ends. Bothridial setae (95–100) with long stalk and short, unilaterally dilated, pointed apically, barbed head. Dorsophragmata comparatively short, longitudinally elongated, directed posteromedially.

Notogaster. Anterior notogastral margin slightly convex medially. Pteromorphs with distinct hinges. Ten pairs of notogastral setae minute (8), thin, smooth. Four pairs of rounded porose areas, Aa larger (8–10) than A1, A2 and A3 (5–8). Distance between porose areas A1–A1 shorter than A2–A2 (1:2). All lyrifissures and opisthonotal gland openings clearly visible.

Gnathosoma . Subcapitulum longer than wide (100–117 × 90–92). Subcapitular setae (a, h) similar in length (27–28), setiform, a slightly thicker than h; setae m slightly shorter (21), thinnest.

Epimeral and lateral podosomal regions. Epimeral setal formula: 3-1-3-3. Epimeral setae setiform, thin, smooth, 1b, 3b and 3c (20–24) longer than others (8). Humeral porose areas Ah elongate oval. Circumpedal carinae of medium size, directed to pedotecta II, but not reaching it.

Anogenital region. Five pairs of genital (g 1, 9–13; g 2 –g 5, 8–10), one pair of aggenital (11–16), two pairs of anal (16–25) and three pairs of adanal (ad 1, 35–44; ad 2, 21–25; ad 3, 11–16) setae setiform, thin, smooth, ad 1 and ad 2 longer than ad 3. Adanal setae ad 1 in posterior, ad 2 in lateral, ad 3 in anterior positions. Adanal lyrifissures located close and parallel to anal aperture.

Legs. Monodactylous.

Material examined. One female (on permanent slide, T0309 ): China, Anhui, Fengyang County, on rice. I.1996; one female (on permanent slide, T0695 ): same place as T0309 . XII.1996. Both specimens were collected by Qingtian Li.

Distribution. China (Anhui), Japan.

Remarks. The main diagnostic character of the subspecies is the thickened lamellar setae. In having this character, it is similar to P. heinrichi Ermilov, Sandmann & Scheu, 2019 from Indonesia, P. kumayaensis Nakamura, Fukumori & Fujikawa, 2010 and P. tohokuensis Fujikawa, 2003 from Japan, and P. heterodactylus Ermilov & Anichkin, 2011 from Vietnam. It differs from P. heinrichi in having thin rostral setae (vs. thickened rostral setae) and bothridial setae with unilaterally dilated head (vs. bothridial setae setiform). It differs from P. kumayaensis in having the lamellar setae inserted on the lamellar ends (vs. inserted medially to the lamellar ends) and thin interlamellar setae (vs. thickened interlamellar setae). It differs from P. tohokuensis in having smooth anal and adanal setae (vs. barbed anal and adanal setae) and custodium absent (vs. custodium present). It differs from P. heterodactylus in having monodactylus legs (vs. bidactylous legs), thin setae 3c and 4c (vs. thickened setae 3c and 4c) and bothridial setae with unilaterally dilated head (vs. bothridial setae setiform).

The conditions of the specimens examined in this study are not good, broken, but the characters of the subspecies are clearly to be diagnosed.

Figures

FIGURE 13. Protoribates crassisetiger nipponicus Fujita, 1989, adult. A. dorsal view. B. lamellar setae. Scale bars: A=50 μm, B=35 μm.

FIGURE 14. Protoribates crassisetiger nipponicus (Fujita, 1989), adult. ventral view. Scale bar 50 μm.