Valid Names Results

Eulecanium giganteum (Shinji, 1935) (Coccidae: Eulecanium)

Nomenclatural History

• Lecanium gigantea Shinji 1935a: 289. Type data: JAPAN: Morioka, on Magnolia kobus.. Syntypes, female, accepted valid name Notes: Type material lost (S. Takagi, 1989, personal communication to Yair Ben-Dov).
• Eulecanium diminutum Borchsenius 1955a: 293. Type data: RUSSIA: Primorye Territory, Lyanzikhe and Okeanskoe, on Quercus sp.. Syntypes, female, Type depository: St. Petersburg: Zoological Museum, Academy of Science, Russia; junior synonym (discovered by Tang1981, 165).
• Eulecanium gigantea (Shinji, 1935); Wang 1980: 45. change of combination

Common Names

• Giant eulecanium KondoGaWa2022
• Sansho-kata-kaigaramushi KondoGaWa2022
• eulecanium gigante KondoGaWa2022

Ecological Associates

Hosts:

Families: 22 | Genera: 42

Foes:

Families: 5 | Genera: 10

Geographic Distribution

Keys

• Tang1991: pp.158 ( Adult (F) ) [China]
• Borchs1957: pp.390 ( Adult (F) ) [Palaearctic region]

Remarks

• Systematics: The results of studies by Deng, et al., 2016 suggest that molecular identification using the COI and 28S genes can be used to identify Eulecanium species correctly. E. kuwanai and E. giganteum were identified successfully using molecular identification methods, and that they are not two different ecological types (wrinkled versus smooth individuals) of the same species. It is impractical to distinguish these two species based on the habitus of post-reproductive females, since species identification requires accurate and efficient methods for identifying organisms in various developmental stages.
• Structure: Young adult females are almost hemispherical, reddish brown to purple-brown with dark irregular lines. The dorsum is covered by thin grey-white powdery wax. At maturity, the body is nearly 19 mm long, 18 mm wide and 14 mm high, making it the largest species in the genus. In mature adult females, there is no visible wax, the scale is dark and often with reddish-brown patches on the dorsum (Kondo & Watson, 2022). Males are winged and have robust legs (Zhao & Xie, 2004). In addition to its large size, E. giganteum can be differentiated from other species in the genus by the following combination of characteristics: (a) marginal setae of one type, conical, present in a single row; (b) the stigmatic spines are notdifferentiated from the marginal setae; (c) the dorsal tubercles are absent; (d) small dorsal tubular ducts are present; and (e) anal ring with eight setae (Kondo & Watson, 2022).
• Biology: Develops one annual generation in northern China (Xie et al., 1995). Xie et al. (1995) have shown in Taiyuan city, Shanxi Province, China, that high level of urban air pollution caused an increase in populations of this species.
• Economic Importance: Owing to the serious damage they cause to garden trees, E. giganteum was listed in the catalogue of quarantine pests for plants imported to the People’s Republic of China in 2007. Eulecanium giganteum seriously threatens jujube production in Xinjiang, which is the main jujube production area of China. (Deng, et al., 2007) E. giganteum causes serious damage mainly to Robinia pseudoacacia and Sophora japonica in Gansu (Xie, 1985) and to Koelreuteria paniculata, Robinia pseudoacacia and Ziziphus jojoba in Xinjiang.. It is also recorded as a pest on Ulmus pumila (EFSA2022c)
• General Remarks: Description and illustration of adult female by Danzig (1980b) (as Eulecanium diminutum). Description and illustration of male developmental instars and adult male by Zhao & Xie (2004).

Illustrations

Citations