Drepanococcus cajani (Maskell, 1891)

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 : 8-10

Drepanococcus cajani (Maskell, 1891)

( Figs 2 , 3 )

Eriochiton cajani Maskell, 1891a: 61 .

Diagnosis. Dorsum with preopercular pores restricted to abdomen ( Fig. 3D ). Venter with multilocular disc-pores frequent on abdomen, some groups also present laterad to metacoxa ( Fig. 3G ); antenna 7 or 8 segmented, with 4th and 5th segments each shorter than wide, or of similar length to width ( Fig. 2C ).

Material examined. 6 ♀♀, LAOS, Thaphabath Dist., Bolikhamsai Prov., 1.xi.2014, coll. J.Y. Choi, on Durio zibethinus L. ( Malvaceae ); 2 ♀♀, Viengkham Dist., Vientiane Prov., 28.iv.2015, coll. P.P. Soysouvanh, on Sanchezia speciosa Le. (Acanthaceae) .

Hosts. Polyphagous. According to García Morales et al. (2016), D. cajani has been recorded from plants belonging to 9 genera in 6 families.

Distribution. Oriental Region ( Hong Kong, India, Malaysia, Philippines, Sri Lanka and Taiwan) ( García Morales et al. 2016); Laos (new country record).

Economic importance. According to Shaw et al. (1999) and Sharma et al. (2015), D. cajani is one of the more injurious pests of pigeon pea ( Cajanus cajan ), which is a major crop in India.

Remarks. Drepanococcus cajani is very closely related to D. chiton (Green) . Williams & Watson (1990) and Hodgson (1994) gave the following morphological differences between the species (character states of D. chiton in parenthesis): (i) 4th and 5th segments of antenna shorter than wide, or of similar length to width (longer than wide), (ii) multilocular disc-pores extending onto the metathorax (restricted to abdominal segments) and (iii) preopercular pores restricted to the abdominal segments (extending onto the thorax).

Figures

FIGURE 2. Drepanococcus cajani (Maskell, 1891). A, population of females in life; B, slide-mounted adult female; C, antenna; D, stigmatic spine. Scale lines for B = 0.5 mm; C = 100 µm; D = 50 µm.

FIGURE 3. Drepanococcus cajani (Maskell, 1891), adult female, from Hodgson (1994). A, stigmatic spine; B1-2, marginal setae; C1-3, dorsal microducts; D, preopercular pore; E, anal plates; F, leg; G, multilocular disc-pore; H1-2, ventral tubular ducts; I, ventral microduct; J, spiracular disc-pore.