Matsumuraja rubifoliae Takahashi, 1931

(Figs 4, 8d, 9d, 11f)

Chaetosiphon anguifragum Zhang & Qiao, 1999: 304 . syn. nov.

Specimens examined.: Holotype of Chaetosiphon anguifragum Zhang & Qiao, 1999: one apterous viviparous female, CHINA: Fujian (Jiangle County), 23.IV.1991, No. 9835-1-1, on Duchesnea indica, coll. W. Y. Zhang.

One apterous viviparous female, CHINA: Guizhou (Tongren County), 30.VII.2014, No. 33685-1-1, on Rubus, coll. F. F. Niu and Y. Q. Li ; one apterous viviparous female, CHINA: Fujian ( Wuyi Mountain), 23.VI.2017, No. 39865-1-1, on Rubus, coll. C. C. Du and K. Hao ; three apterous viviparous females, CHINA: Yunnan (Dulongjiang County), 25.IX.2020, No. 49353, on Rubus, coll. Y. Xu ; one apterous viviparous female, CHINA: Hubei (Badong County), 26.IV.2016, No. 36773-1-1, on Rubus, coll. X. C. Zhu ; one apterous viviparous female, CHINA: Guangxi ( Guilin City), 31.VIII.2020, No. 48903-1-1, on Rubus, coll. T. Y. Liu ; two apterous viviparous females, CHINA: Sichuan ( Ganzi City), 11.X.2018, No. 45005-1-1, on Rubus, coll. J. F. Ji.

Diagnosis. Ant I. with one short finger-like process on the inner side (Fig. 4b), 0.41–0.58 times the segment; abdominal tergite VII with two paired spinal tubercles, which are slightly swollen (Fig. 4f), and other tergites without tubercles; dorsal setae of abdominal tergites I–VI short and blunt (Fig. 4d), 0.15–0.46 times the Ant. IIIBD, sometimes the setae of abdominal tergite VI long and capitate in summer form, but dorsal setae of abdominal tergites I–VI long, thick and capitate on developed setal tubercles in autumn form (Takahashi & Sorin 1965); spinal setae of abdominal tergites VII–VIII long, thick, and capitate, 1.54–3.00 times Ant. IIIBD.

Distribution. China (Fujian, Guangxi, Guizhou, Hubei, Sichuan, Yunnan), Japan.

Comments. After checking the specimens of Chaetosiphon anguifragum Zhang & Qiao (Fig. 9d), the species can be identified as follows: Ant. I with one short finger-like process on the inner side; only abdominal tergite VII with one paired spinal tubercles, slightly swollen, and each with one long, thick and capitate seta; dorsal setae long, thick, capitate and on developed setal tubercles; SIPH long cylindrical, and swollen in distal part; first tarsal chaetotaxy: 3, 3, 3. However, the generic diagnosees of Chaetosiphon Mordvilko, 1914 are as follows: Ant. I without one finger-like tubercle on the inner side; dorsal setae long, thick, capitate or blunt distally on developed setal tubercles but abdominal tergites without tubercles; first tarsal chaetotaxy: 5, 5, 5; SIPH long cylindrical, not swollen. According to these characteristics of Chaetosiphon, Chaetosiphon anguifragum Zhang & Qiao, 1999 is not suitable for this genus. Among the specimens, only abdominal tergite VII bears one pair of slightly swollen spinal tubercles, which is similar to M. rubifoliae Takahashi and Matsumuraja rubiphila Takahashi. Matsumuraja rubifoliae Takahashi can be distinguished by Ant I. with one short finger-like process on the inner side, abdominal tergite VII with two paired spinal tubercles, slightly swelling, dorsal setae short and blunt in summer and long, thick and capitate on developed setal tubercles in autumn (Fig. 8d). Matsumuraja rubiphila Takahashi can be distinguished by Ant. I with one long finger-like process on the inner side, the dorsal setae of abdominal tergites I–VI are short and capitate, but the spinal setae of abdominal tergites VII–VIII are long, thick and capitate, on swollen setal tubercles (Fig. 9a). In conclusion, the diagnosis of Chaetosiphon anguifragum Zhang & Qiao is similar to that of the autumn form of M. rubifoliae Takahashi. Hence, Chaetosiphon anguifragum Zhang & Qiao, 1999 is regarded as the synonym of Matsumuraja rubifoliae Takahashi.