Milviscutulus Williams & Watson, 1990

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: 42

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Milviscutulus Williams & Watson, 1990


Genus Milviscutulus Williams & Watson, 1990 

Type species: Lecanium mangiferae Green, 1889  , by original designation.

Diagnosis. Dorsum with anal plates together kite-shaped, each plate with anterolateral margin over 1.7 times as long as posterolateral margin ( Figs 37DView FIGURE 37, 38EView FIGURE 38); dorsal setae clavate or flagellate ( Fig. 38FView FIGURE 38); tubular ducts absent; duct tubercles present or absent ( Fig. 38DView FIGURE 38); and preopercular pores present ( Fig. 38CView FIGURE 38). Marginal setae with pointed or fimbriate apices ( Fig. 38MView FIGURE 38). Stigmatic clefts small, each containing 3 stigmatic spines ( Fig. 38MView FIGURE 38). Venter with multilocular disc-pores each with 7–10 loculi ( Fig. 38KView FIGURE 38); ventral tubular ducts of 2 types (type I: each with a broad inner ductule; type II: each with a narrow inner ductule) ( Figs 37CView FIGURE 37, 38HView FIGURE 38); antenna 6 to 8 segmented, usually with 7 segments ( Fig. 38PView FIGURE 38); legs with tibio-tarsal articulatory scleroses ( Fig. 38JView FIGURE 38) ( Williams & Watson 1990; Hodgson 1994).

Remarks. Milviscutulus  contains 4 described species, most of which are confined to Indonesia, Fiji, Papua New Guinea, Solomon Islands and Western Samoa in the Oriental and Australian regions, except for one tropicopolitan species, M. mangiferae  . The genus is similar to Protopulvinaria  , but is easily differentiated from the latter by the distribution of ventral tubular ducts which are scarce or absent on the head and prothorax; in contrast, Protopulvinaria  has abundant ventral tubular ducts in these areas ( Williams & Watson 1990; Hodgson 1994).