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

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 , 38E ); dorsal setae clavate or flagellate ( Fig. 38F ); tubular ducts absent; duct tubercles present or absent ( Fig. 38D ); and preopercular pores present ( Fig. 38C ). Marginal setae with pointed or fimbriate apices ( Fig. 38M ). Stigmatic clefts small, each containing 3 stigmatic spines ( Fig. 38M ). Venter with multilocular disc-pores each with 7–10 loculi ( Fig. 38K ); ventral tubular ducts of 2 types (type I: each with a broad inner ductule; type II: each with a narrow inner ductule) ( Figs 37C , 38H ); antenna 6 to 8 segmented, usually with 7 segments ( Fig. 38P ); legs with tibio-tarsal articulatory scleroses ( Fig. 38J ) ( 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).

Figures

FIGURE 37. Milviscutulus mangiferae (Green, 1889). A, population of females in life; B, slide-mounted adult female; C, ventral tubular ducts near mesocoxa; D, anal plates. Scale lines for B = 0.5 mm; C = 10 µm; D = 100 µm.

FIGURE 38. Milviscutulus mangiferae (Green, 1889), adult female, from Williams & Watson (1990). A, simple pore; B, dorsal microduct; C, preopercular pore; D, dorsal tubercle; E, anal plates; F, dorsal setae; G, ventral seta; H1-2, ventral tubular ducts; I, anterior and lateral marginal setae on anogenital fold; J, leg; K, multilocular disc-pore; L, spiracular disc-pore; M, stigmatic spines and marginal setae; N, ventral microduct; O, preantennal pore; P, antenna.