Valid Names Results

Platylecanium nepalense Takagi, 1975 (Coccidae: Platylecanium)

Nomenclatural History

• Platylecanium nepalense Takagi 1975: 7. Type data: NEPAL: Balaju, on plant of the Anacardiaceae.. Holotype, female, Type depository: Sapporo: Entomological Institute, Faculty of Agriculture, Hokkaido University, Japan; accepted valid name
• Platylecanium hepalense Takagi, 1975; Tang 1991: 133. misspelling of species epithet

Common Names

Ecological Associates

Hosts:

Families: 3 | Genera: 4

Geographic Distribution

Keys

• JoshiFi2019: pp.7 ( Adult (F) ) [Species of Platylecanium]
• Tang1991: pp.133 ( Adult (F) ) [Asia]

Remarks

• Systematics: P. nepalense can be distinguished by the following features: body margin smooth, stigmatic spines 4 or 5 in each stigmatic cleft, anal plates together rhombus and legs absent (Wang & Feng, 2013) Adult female elongate to broadly oval, often asymmetrical, with one side straight and the other rounded; usually flat; dorsum membranous to moderately sclerotized; margins crenelated or smooth; anal cleft about one-sixth length of body. Eyes dorsal, submarginal, usually situated opposite antennae, each eye surrounded by clear area. Antenna each with 1–6 segments, short. Legs absent. Anal plates triangular. Stigmatic clefts well developed, often deep. Stigmatic setae present in groups of 3 on dorsum, each group situated at the base of stigmatic cleft, the setae blunt and finger like, usually elevated from derm, each situated at the tip of a conical to bulbous membranous tubercle. Dorsal minute pores present, the pores and setae often in a definite pattern. Ventral setae short. Multilocular present on one or two segments anterior to vulva. Quinquelocular pores present in stigmatic furrows. Tubular ducts absent. Microducts present on venter (Williams and Watson, 1990).
• Structure: Crawlers yellow. Second instar nymphs transparent, anal plates brownish opaque, anal and stigmatic clefts white margin with thin wax filaments. Third instar nymphs with marginal and submarginal area translucent, median area opaque yellow with central area turning darker. Dorsal surface coated with a delicate transparent waxy layer which is thickened in definite polygonal plates arranged in longitudinal series around dorsomedial ridge that runs from anal plate to prothorax. Marginal wax becoming more pronounced with age. Females developing on the leaf edge and adjacent to the midrib tending to become asymmetrical. Ventral position of the live female indicates absence of legs and presence of very short antenna and clear demarcation of marginal and submarginal areas. Adult female developed away from midrib or leaf margin perfectly symmetrical. Very well marked marginal area yellowish brown and submarginal area brown. Median area golden yellow with central area orange brown. Transparent waxy layer producing irregularly polygonal 25–27 depressions arranged symmetrically around both the sides of dorsomedial ridge. These depressions having carapace pattern. Black eyes prominent.(Joshi & Firake, 2018)
• General Remarks: Detailed description in Takagi, 1975. Detailed redescription and illustrations in Joshi & Firake, 2018. The description of Malaysian specimens in Hodgson, 2025, differs from that given by Joshi & Firake (2020) in that their anal plates were significantly longer than in the Malaysian specimens; and differs from both Joshi & Firake (2020) and Takagi (1975) in the frequency of the marginal setae, which was apparently much higher on the Malaysian specimens.

Illustrations

Citations