Valid Names Results

Platylecanium riouwense Takahashi, 1951 (Coccidae: Platylecanium)

Nomenclatural History

• Platylecanium riouwense Takahashi 1951b: 104. Type data: INDONESIA: Riau [=Riouw] Islands, Rempang, host plant of type material not indicated.. Syntypes, female, Type depository: Sapporo: Entomological Institute, Faculty of Agriculture, Hokkaido University, Japan; accepted valid name
• Platylecanium riouwanse Takahashi, 1951; Joshi & Firake 2019: 7. misspelling of species epithet

Common Names

Ecological Associates

Geographic Distribution

Keys

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

Remarks

• Systematics: Platylecanium riouwense differs from the other elongate species of Platylecanium in having the anterior and posterior margins of the anal plates subequal in length or posterior margin shorter than the anterior margin, and each plate with a blunt apex (the other three species have anal plates with the posterior margins clearly longer than anterior margins, and each plate has a pointed apex).(Hodgson, 2025)
• Structure: The key character-states that can be gleaned from Takahashi's description in 1951 are: (i) body elongate, 2.6 mm long, about 2.2 times longer than broad; (ii) margin not crenulated (“simple”); (iii) dorsum with faint, large areolations submarginally; (iv) clear areas present, but perhaps only posterior 3 pairs; (v) stigmatic clefts small, each with 3 stigmatic spines; (vi) stigmatic spines slender and blunt, not reaching margin; (vii) marginal setae short, fine and curved, much shorter than stigmatic spines; (viii) marginal setae few, perhaps with only 6 on each side between stigmatic clefts; (ix) anal plates about 2.5 times longer than width of a single plate, each with a blunt apex, and (x) each anal plate with posterior margin convex and subequal in length or slightly shorter than anterior margin. (Hodgson, 2025)
• General Remarks: Good description and illustration of adult female by Takahashi (1951b). The key in the paper, Joshi, S., & Firake, D.M. 2019 First record of Platylecanium nepalense Takagi (Hemiptera: Coccomorpha: Coccidae) from India, with redescription and a key to the species of Platylecanium Cockerell & Robinson, is for species of Platylecanium in the world, but by mistake Joshi wrote it's heading as key to the species known from India. (Joshi, pers. comment)

Illustrations

Citations