Aleuromarginatus dielsianae Wang & Xu

Wang, Ji-Rui, Xu, Zhi-Hong & Du, Yu-Zhou, 2017, A new species of Aleuromarginatus Corbett, 1935 with a key and checklist of Chinese species (Hemiptera, Aleyrodidae), ZooKeys 682, pp. 95-104 : 96-97

Aleuromarginatus dielsianae Wang & Xu sp. n. Figures 1-2, 3-4, 5-10, 11-13, 14-16

Type locality.

China, Zhejiang, Jiangshan, Shuangxikou village, 28°40'N, 118°40'E, 512 m, on Millettia dielsiana Harms, 8. viii. 2016, leg. JR Wang.

Type material.

Holotype. China, Zhejiang, Jiangshan, Shuangxikou village, 28°40'N, 118°40'E, 512 m, 1 puparium on slide, on Millettia dielsiana Harms, 8. viii. 2016, leg. JR Wang, deposited in Insect Collection of Zhejiang Agriculture & Forestry University (ZAFU), Lin’an, China.

Paratypes. 35 paratypes of which: 28 are puparia on 20 slides, data same as holotype and 7 are puparia on 5 slides collected in Jingling town, 29°22'N, 120°46'E, 308 m, Xinchang, Zhejiang, China, on Millettia dielsiana Harms, 12. xi. 2016, leg. JR Wang, deposited in ZAFU. 68 dry puparia on Millettia dielsiana Harms leaves with above collection data available at ZAFU.

Diagnosis.

This species is characterized by the dark brown margin area (Figs 4, 11, 12), in life with a pair of longitudinal submedian lines (Fig. 4) and microscopically with a pair of longitudinal submedian furrows (Figs 5, 7, 8, 11) from cephalothorax to the vasiform orifice. Submargin with an elongate-oval fold at the base of each marginal tooth and with 3-4 rows of irregularly shape papillae (Figs 9, 12). Nine pairs submedian setae (Fig. 14), minute, blunt - one pair of cephalic setae (cs), two pairs of thoracic setae (ts), six pairs of abdominal segment I and III-VI, VIII (as1, 3-6, 8); 13 pairs submarginal setae (sms) (Fig. 14) - three cephalic pairs, five thoracic pairs, one abdominal pair, and four posterior pairs. Vasiform orifice cordate (Figs 10, 13, 16); operculum broadly trapezoidal, covering nearly half the orifice; lingula exposed, setose, knobbed. Paired posterior marginal setae present while anterior marginal setae absent. Thoracic and caudal tracheal folds and pores discernible (Figs 6, 14).

Description.

Puparium. Puparia have highly characteristic secretions in the form of a broad, laterally directed, white fringe on each side of the body, the fringe about 0.24-0.29 mm long; body light yellowish, transparent, margin dark brown; two longitudinal pigmented bands encompassing the submedian zone on either side of the body lines from cephalothorax to vasiform orifice; elliptical, 1.08-1.12 mm long, 0.75-0.82 µm wide, broadest at the abdominal segments I region. The presence of a colony can be easily ascertained by the dense bumps on the upper surface of the leaves caused by the puparia which embed themselves into the under surface of leaves, pushing the top surface of the leaf upward (Fig. 1).

Margin (Figs 9, 12, 15) strongly toothed, with a pore at the base of each 3-4 teeth, 13-15 crenulations in 0.1 mm. The thoracic and caudal tracheal areas slightly recessed and differentiated from margin. Paired posterior marginal setae (pms) present, about 35.1 µm long, anterior marginal setae absent.

Dorsum almost flat, without tubercle, sparsely scattered with pores. Submarginal area not clearly separated from dorsal disk. A pair of dark brown longitudinal furrows (Figs 4, 5, 7, 8, 11) extending from the cephalic region to the vasiform orifice, the longitudinal furrows consist of some short longitudinal furrows. Submargin with an elongate-oval fold at the base of each marginal tooth and with 3-4 rows of irregular shape papillae (Figs 9, 12). Nine pairs submedian setae, minute, blunt - one pair of cephalic setae (cs), two pairs of thoracic setae (ts2, 3) which are on the 2nd and 3rd thoracic segments; six pairs of abdominal setae, one pair on each segments I and III-VI, VIII (as 1, 3-6, 8). Thirteen pairs submarginal setae (sms) - 3 cephalic pairs, 5 thoracic pairs, 1 abdomen pair and 4 posterior pairs. The submedian setae and submarginal setae each arising from a small tubercle and are subequal in length, about 6.1-6.7 µm. Longitudinal and transverse molting sutures reaching the anterior and lateral margin, respectively. The transverse molting suture slightly protruding forming a transverse ridge (Fig. 7). Thorax and abdominal segment sutures well defined, midline of abdominal segments I-II each about 44.5 µm in length; abdominal segments III-IV each about 54.8 µm in length; abdominal segments V about 47.3 µm in length; abdominal segments VI about 35.6 µm in length; abdominal segments VII about 12.7 µm in length.

Vasiform orifice (Figs 10, 13, 16) cordate, longer than wide, 65.5-68.3 µm long, 60.2-62.3 µm wide; operculum broadly trapezoidal, covering nearly half the orifice, 29.5-34.8 µm long, 39.2-41.2 µm wide. Lingula exposed, setose, knobbed, 9.1-12.2 µm long, 13.6-16.4 µm wide, with a pair of apical setae, about 7.4 µm in length.

Venter. Thoracic and caudal tracheal folds and pores discernible (Fig. 6). Ventral abdominal setae placed on either side of anterior angles of vasiform orifice, finely pointed and 5.7-7.8 µm long, 53.1 µm apart. Antenna slender, long, extending slightly beyond the prothoracic spiracular furrow but not reaching base of mesothoracic leg.

Host plant.

Millettia dielsiana Harms (Figs 1, 2) ( Rosales : Fabaceae ).

Distribution.

China (Zhejiang).

Biology.

Specimens were found on the leaves in colonies from 20 - 60 individuals, distributed throughout the under surface of leaves (Fig. 2). No parasitoids were obtained from the puparia and no ants were observed attending the whiteflies.

Etymology.

The species name takes its name of host plant Millettia dielsiana Harms.

Remarks.

The new species resembles A. millettiae Cohic but differs in that the longitudinal furrows extend from the submendian region of the cephalic to the vasiform orifice while they are only present on the abdomen for A. millettiae and differs in the number and postion of the submarginal setae. The new species also resembles A. kallarensis David & Subramaniam but can be easily distinguished by the shape and the size of the puparia.