Paralecanium expansum ( Green, 1896 )

Choi, Jinyeong, Soysouvanh, Pheophanh, Lee, Seunghwan & Hong, Ki-Jeong, 2018, Review of the family Coccidae (Hemiptera: Coccomorpha) in Laos, Zootaxa 4460 (1), pp. 1-62 : 37

Paralecanium expansum ( Green, 1896)

( Figs 32 , 33 )

Lecanium expansum Green, 1896: 9 .

Diagnosis. Dorsum with setae bluntly spinose or slightly capitate ( Fig. 33D ); preopercular pores present anterolaterally to anal plates, in 2 groups on each side ( Figs 32E , 33G ). Stigmatic clefts each containing 3–9 stigmatic spines ( Fig. 33A ). Legs represented by leg stubs ( Figs 32D , 33J ) (partially adopted from Green 1904b; Morrison 1920; Tao et al. 1983; Hodgson & Williams, 2018).

Material examined. 30 ♀♀, LAOS, Phou Khao Khuay National Bio-Diversity Conservation Area, Thaphabath Dist., Bolikhamsai Prov., 4.v.2015, coll. J.Y. Choi, on Mangifera indica L. ( Anacardiaceae ).

Hosts. Polyphagous. According to García Morales et al. (2016), P. expansum has been recorded from plants belonging to 10 genera in 9 families.

Distribution. Mainly known from Australian and Oriental Regions ( Hong Kong, India, Indonesia, Malaysia, Singapore, Sri Lanka and Taiwan) ( García Morales et al. 2016); Laos (new country record).

Economic importance. Paralecanium expansum has not been recorded as an economically important pest.

Remarks. Paralecanium expansum closely resembles P. quadratum ( Green, 1904b) , but has 2 groups of preopercular pores on each side and leg stubs, whereas P. quadratum has 3 groups of preopercular pores on each side and entirely lacks legs ( Tao et al. 1983).

Figures

FIGURE 32. Paralecanium expansum (Green, 1896). A, population of females in life; B, slide-mounted adult female; C, marginal setae; D, leg stub near antenna; E, groups of preopercular pores. Scale lines for B = 0.5 mm; C, E = 50 µm; D = 10 µm.

FIGURE 33. Paralecanium expansum (Green, 1896), adult female, from Hodgson & Williams (2018). A, stigmatic cleft with stigmatic spines; B, simple pore near margin; C, simple pore more medially; D, dorsal seta; E, dorsal and ventral view of anal plates and anogenital area; F, dorsal areolations; G, preopercular pore; H, marginal seta; I, multilocular disc-pore; J, leg stubs; K, ventral microduct; L, spiracular disc-pore; M, antenna.