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 37D View FIGURE 37 , 38E View FIGURE 38 ); dorsal setae clavate or flagellate ( Fig. 38F View FIGURE 38 ); tubular ducts absent; duct tubercles present or absent ( Fig. 38D View FIGURE 38 ); and preopercular pores present ( Fig. 38C View FIGURE 38 ). Marginal setae with pointed or fimbriate apices ( Fig. 38M View FIGURE 38 ). Stigmatic clefts small, each containing 3 stigmatic spines ( Fig. 38M View FIGURE 38 ). Venter with multilocular disc-pores each with 7–10 loculi ( Fig. 38K View 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 37C View FIGURE 37 , 38H View FIGURE 38 ); antenna 6 to 8 segmented, usually with 7 segments ( Fig. 38P View FIGURE 38 ); legs with tibio-tarsal articulatory scleroses ( Fig. 38J View 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).