Stigmaeopsis continentalis Saito et Lin, 2018

Saito, Y., Sato, Y., Chittenden, A. R., Lin, J. - Z. & Zhang, Y. - X., 2018, Description of two new species of Stigmaeopsis, Banks 1917 (Acari, Tetranychidae) inhabiting Miscanthus grasses (Poaceae), Acarologia 1917 (2), pp. 414-429 : 420-422

Stigmaeopsis continentalis Saito et Lin n. sp. ( Figures 4 – 5 , Tables 1, 2

and 3)

(Japanese name: Bin-sugomori-hadani) Zoobank: DCFE3743-86CD-45CC-BC50-9FB5F6DD8C32

Stigmaeopsis miscanthi in Tsuji et al. (2011); Stigmaeopsis miscanthi Cn form in Sakamoto et al. (2017)

Female — Body flattened and wide, straw to greenish yellow with small blackish green spots. Body size 476.3 ± 25.2 μm from tip of rostrum to end of hysterosoma and 327.3.1

± 15.0 μm from middle of horizontal line connecting setae v 2 bases to end of hysterosoma.

Propodosoma well demarcated from hysterosoma. Bases of all dorsocentral hysterosomal setae (c 1, d 1, e 1 and f 1) placed approximately in a straight line and the pair of lines forms a V shape.

Length of dorsocentral hysterosomal setae d 1 much longer than distance between their bases and exceed bases of f 1. Distance between bases of dorsolateral hysterosomal setae c 2 subequal to distance between bases of dorsolateral hysterosomal setae d 2. Hysterosomal setae h 3 (2nd para-anal setae) present. Lengths of dorsal setae and distances between their bases listed in Tables 1 and 2. Genital flap and area anterior to flap transversely striate (almost same as Fig.

1E). Palp tarsus with two simple setae and one conical spinneret, two eupathidia and one solenidion. Spinneret conical in shape ( Fig. 4A ). Numbers of setae on leg segments presented in Figures 5 A-B and Table 3.

Male — Body size 415.9 ± 15.6 μm from tip of rostrum to end of hysterosoma and 302.4

± 9.5 μm from middle of horizontal line connecting setae v 2 bases to end of hysterosoma. Lengths of dorsal setae and distances between their bases as in Table 1. Femur-I with 9 normal setae, one of which is tiny (dwarfed) and additional to female setation. Numbers of setae and solenidia on distal segment of palpus presented in Fig. 4C and those on leg segments presented in Figures 5 C-D, and Table 3. Aedeagus broadly curved dorsally, weakly sigmoid ( Fig. 4D ).

Type Material — HOLOTYPE: 1 male, made with Canada balsam, Fuqing , China, Miscanthus sp. 26 Feb. 2014, Saito Y . PARATYPES: 1 female, same data. 2 males (1 collected on 20 Feb. 2015 made with balsam and the other on 14 Apr. 2017 with Hoyer’s medium),

Fuzhou, China, Miscanthus sp. and 3 females (on 28 Aug. 2015, one with balsam and the other with Hoyer’s medium), Fuzhou, China, Miscanthus sp. These are deposited in the Zoological Museum at Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China.

Host and Distribution — Fuqing, Fuzhou and Wuiy, Fujian Prov., China parasitic to Miscanthus sinensis and Miscanthus spp.

Remarks — This species resembles both S. miscanthi and S. sabelisi but is distinguished from them by several characters as follows: the distance between the bases of dorsolateral hysterosomal setae c 2 almost the same as that between the bases of dorsolateral hysterosomal setae d 2 in S. continentalis , but the distance between the bases of c 2 is longer than that between the bases of d 2 in both S. sabelisi and S. miscanthi ; in both S. continentalis and S. miscanthi ,

length of dorsocentral hysterosomal setae d 1 are much longer than distance between their bases and extend past the bases of f 1, but setae d 1 are almost the same length as distance between their bases in S. sabelisi .

Life type — This species lives within dense web nests (WN-c life type in Saito 1983) built over depressions on leaf adaxial surface (along midvein).

Figures

Figure 1 Stigmaeopsis sabelisi n. sp.: A – Dorsum of female; B – Distal segment of palpus of female; C – Distal segment of palpus of male; D – Aedeagus; E – Female genital flap and anterogenital area.

Figure 4 Stigmaeopsis continentalis n. sp.: A – Dorsum of female; B – Distal segment of palpus of female; C – Distal segment of palpus of male; D – Aedeagus.

Figure 5 Stigmaeopsis continentalis n. sp.: A – Femur, genu, tibia and tarsus I of female; B – Femur, genu, tibia and tarsus II of female; C – Femur, genu, tibia and tarsus I of male; D – Femur, genu, tibia and tarsus II of male.