Pentatrichosiphum luteum Basu, 1969

Zhang, Dong & Qiao, Gexia, 2007, Pentatrichosiphum (Sternorrhyncha: Aphididae), a generic account with the description of a new species from Hainan, China, Journal of Natural History 41 (37 - 40), pp. 2419-2431 : 2428-2430

Pentatrichosiphum luteum Basu, 1969 (new record for China)

Pentatrichosiphum luteum Basu 1969, p 183 ; Noordam 1994, p 140.

Greenideodia (Pentatrichosiphum) luteum (Basu) : Raychaudhuri and Chatterjee 1980, p 351; Ghosh and Agarwala 1993, p 263; Remaudière and Remaudière 1997, p 176.

Description

The morphological characters of the apterous viviparous female and alate viviparous female are the same as in the descriptions by Ghosh and Agarwala (1993) and Noordam (1994).

First-instar nymph. Body yellow in life.

Mounted specimens: body long oval, 3.21× width. Eyes and apical part of antennal segment IV pale brown, others pale.

Head: dorsal hairs thick and long, pointed and each with a tuberculate base. Head with one pair of frontal hairs, one pair of dorsal hairs between antennae, and two pairs of dorsal hairs between eyes. Length of cephalic hairs 0.093 mm, 3× widest diameter of antennal segment III. Eyes with three facets. Antennae four-segmented, 0.4× body length ( Figure 26 ). Length in proportion of segments I–IV: 36, 36, 100, 63+91, respectively; processus terminalis 1.43× base of the segment IV. Antennal hairs stout, long and pointed, segments I–IV each with 3, 2, 3, 2+0 hairs, respectively, apex of processus terminalis with three hairs; length of hairs on segment III 2.67× widest diameter of the segment. Rostrum reaching abdominal segment IV; ultimate rostral segment stout and short, wedge-shaped, 4.29× basal width, 1.67× second hind tarsal segment.

Thorax: dorsum of thorax pale. Dorsal hairs of thorax thick and long, pointed or ramose, each with a tuberculate base. Pronotum with four pairs of spinal and four pairs of marginal hairs; mesonotum and metanotum each with one pair of spinal, one pair of pleural, and one pair of marginal hairs. Legs pale, except claws brown. Tibiae with weakly transverse imbrications. Hind femur 1.18× antennal segment III; hind tibia 0.21× body length. Length of hairs on hind tibiae 1.33× mid-diameter of the segment. First tarsal chaetotaxy: 2, 2, 2.

Abdomen: pale. Dorsal hairs of abdomen thick and long, pointed or ramose, most dorsal hairs with tuberculate base. Abdominal tergites I–VI each with one pair of spinal, one pair of pleural, and one pair of marginal hairs; tergite VII with one pair of cone-shaped marginal tubercles, each with one long hair at apex, and one pair of spinal hairs ( Figure 28 ); tergite VIII with one pair of spinal tubercles, each with one long hair at apex. Length of marginal hairs on abdominal tergite I about 4× widest diameter of antennal segment III. Siphunculi short, cone-shaped ( Figure 27 ); 2× basal width, 6× distal width, 0.13× body length. Cauda semi-round, 0.5× basal width, with two hairs. Anal plate transversely elliptical, with four hairs.

Material examined

Three apterous viviparous females, one alate viviparous female, one first-instar nymph and 12 alatoid nymphs, China: Hainan, Mt Diaoluo Reserve (18 ° 409N, 109 ° 549E), altitude 1000 m, 18 November 2006, by X. L. Huang, on Lauraceae (ZMCAS, no. 19536); one apterous viviparous female, two first-instar nymphs, China: Hainan, Mt Bawangling Reserve (19 ° 099N, 109 ° 189E), altitude 1015 m, 9 May 2007, by D. Zhang, on Litsea cubeba (ZMCAS, no. 19642).

Biology

This species infests Lauraceae ( Lindera sp. , Litsea sp. , and Persea americana ), Fagaceae ( Quercus sp. ), and Solanaceae ( Cestrum fasciculatum ).

Distribution

China (Hainan); India (Meghalaya, West Bengal), Bhutan (Manas Sanctuary), Indonesia (Java).

Figures

Figures 18–28. Pentatrichosiphum luteum Basu. (18–25) Apterous viviparous female: (18) antennal segment IV; (19) antennal segment V; (20) antennal segment III; (21) ultimate rostral segment; (22) siphunculus; (23) cauda; (24) anal plate; (25) genital plate. (26–28) First-instar nymph: (26) antenna; (27) siphunculus; (28) marginal tubercle on abdominal tergite VII. Scale bars: 0.10 mm.