Exilipedronia multipori Tan & Xing, 2024

Tan, Zhixiang & Xing, Jichun, 2024, First record of the genus Exilipedronia Williams, 1960 (Hemiptera: Coccomorpha: Pseudococcidae) in China, with description of a new species on bamboo, Zootaxa 5458 (1), pp. 141-146 : 142-146

Exilipedronia multipori Tan & Xing , sp. n.

( Figs 1–3 )

Material examined

Holotype: adult ♀, CHINA: Guizhou Prov., / Libo County, Qinglongtan , / 25°13′38″N, 108º1′21″E, / 480 m altitude, / on Bambusa sp. ( Poaceae ), / 16. August. 2022, / Zhixiang Tan leg., mounted together with 1 paratype adult ♀ on a slide ( GUGC).

Paratypes: Same data as holotype, 4 adult ♀♀, with 2 mounted together on 1 slide ( NFUC) , 1 mounted on 1 slide ( GUGC) , and 1 mounted on same slide as holotype ( GUGC) .

Appearance in life ( Fig. 1 ). Body of adult female black, antennae and legs yellowish-brown. Dorsum of young adult specimen partly covered in white powdery wax secretions, leaving some submedian and submarginal patches of exposed dark cuticle, with segmentation evident; and with short, broad white wax projections around margins. Dorsum of mature adult entirely coated with flocculent white powdery wax, obscuring segmentation, and with short, broad white wax projections around margins tending to merge or become irregularly clumped.

Slide-mounted adult female (n = 5) ( Figs 2 and 3 ). Body broadly oval, derm membranous, 2.2 (1.4‒2.5) mm long and 1.5 (0.9‒1.6) mm wide. Anal lobes well developed, each ventral surface with an apical seta 250 (180‒230) µm long, a faint, partial anal lobe bar extending mesad from bar seta; and a bar seta about 37 (36‒44) µm long. Antennae each about 345 (325‒350) µm long, with 8 segments; apical segment with 3 enlarged fleshy setae. Legs well developed; hind leg segment lengths (in µm): trochanter + femur 210 (200‒240), hind tibia + tarsus 230 (220‒ 240); claw stout, curved, about 10‒20 (18‒25); without a denticle; claw denticles 22‒24 (21‒27), longer than the claw, and knobbed. Tarsal digitules knobbed, 34‒36 (34‒38), much longer than the claw denticles. Ratio of lengths of hind tibia + tarsus to hind trochanter + femur 1.00‒1.13: 1 (1.00‒1.13: 1). Ratio of lengths of hind tibia to tarsus 1.64‒1.82: 1 (1.80‒1.81: 1). Translucent pores present on anterior and posterior surfaces of hind coxa and on posterior surface of hind tibia. Labium 65 (62‒73) µm long, much shorter than clypeolabral shield. Circulus situated between abdominal segments III and IV, 89 (87‒127) µm long and 119 (117‒153) µm wide, divided by a segmental fold. Ostioles well developed, with inner edges of lips sclerotized, each lip with 4‒6 setae and 8‒11 trilocular pores. Anal ring about 75 (65‒80) µm long and 65 (65‒75) µm wide, with 2 rows of pores and bearing 6 setae, each seta about 105‒150 (100‒150) µm long. Cerarii numbering 18 pairs, each situated on a rounded sclerotized prominence. Anal lobe cerarii each containing about 10‒11 (9‒13) conical setae of different sizes (including those on dorsal and ventral margins), each seta with a prominent collar, longest seta about 34 µm long and 7 µm wide at base, and a few trilocular pores, all situated on a sclerotized area larger than anal ring; other cerarii on posterior abdominal segments similar, each bearing about 10‒16 (10‒18) conical setae; cerarii becoming slightly smaller anteriorly to thorax, then increasingly larger anteriorly up to frontal cerarii (C 1), except for preocular pair (C 2) much smaller, each with only about 5 or 6 (5‒7) conical setae.

Dorsum with setae similar to those in cerarii, but stouter; others slenderer, each 12‒15 µm long. On abdomen, setae absent from intersegmental areas. On thorax, setae becoming scattered and more numerous. All setae with prominent collars, some with associated trilocular pores. Multilocular disc-pores absent. Trilocular pores evenly distributed, each 4.0‒4.8 µm in diameter. Discoidal pores minute, scattered.

Venter with normal, fairly short flagellate setae, each 12‒35 µm long. Cisanal setae each about 38 (30‒45) µm long, obanal setae each about 27‒33 (24‒33) µm long. Multilocular disc-pores, each 8.0‒10.0 µm in diameter, present posterior to vulva and medially, in single rows across posterior edges of abdominal segments IV‒VII, numbering as follows: segment IV, 8‒16; V, 20‒26; VI, 20‒28; VII, 18‒22; and VIII, 6‒9. Trilocular pores same size as those on dorsum, present around margins, mostly associated with cerarian prominences; others smaller, each 3.5‒4.0 µm in diameter, present mainly in medial areas of abdomen. Discoidal pores few and scattered, each about 3.0 µm in diameter. Oral collar tubular ducts, each about 12‒14 µm long, 4‒5 µm wide at orifice, and as wide as or slightly narrower than a trilocular pore, fairly numerous on head and thorax, but present only in small marginal groups on abdomen.

Distribution. China (Guizhou Province).

Host plant. Poaceae : Bambusa sp.

Remarks. Exilipedronia multipori sp. n. is most similar to E. globulosa in the shape of the cerarii and their prominences, and the distribution of the oral collar tubular ducts; both species feed on bamboo. However, E. multipori sp. n. differs from E. globulosa by the following features (condition of E. globulosa given in parentheses): (i) antennae each with 8 segments (7 segments); (ii) multilocular disc-pores present on abdominal segment IV (absent from abdominal segment IV); and (iii) total number of multilocular disc-pores more than 70 (fewer than 40 in E. globulosa , based on Williams (2004: 262, fig. 107)).

Etymology. The new species epithet is derived from the Latin prefix “ multi -”, meaning many, and “ pori ”, referring to the many multilocular disc-pores on venter.

Figures

FIGURE 1. Habitus of Exilipedronia multipori Tan & Xing, sp. n. A. The type locality, to show habitat; B. An infested leaf of Bambusa sp. Young adult female: C. In life; E. Dorsal view; F. Ventral view. Mature adult female: D. In life: G. Dorsal view; H. Ventral view.

FIGURE 2. Exilipedronia multipori Tan & Xing, sp. n., slide-mounted holotype adult female. Scale bar = 500 µm.

FIGURE 3. Exilipedronia multipori Tan & Xing, sp. n., holotype adult female. A. Cerarian seta; B, D. Dorsal setae; C. Discoidal pore; E. Trilocular pore near margin; F. Multilocular disc-pore; G. Oral collar tubular duct; H. Hind tibia; I. Hind coxa; J. Trilocular pore in medial area of abdomen; K. Antenna.