Paracoccus wui Zhang, 2024

Zhang, Jiang-Tao, Li, Chao-Qun, Liu, Xing-Ping & Wang, Yan, 2024, Two new species of the mealybug genus Paracoccus from Jiangxi, South China (Hemiptera, Coccomorpha, Pseudococcidae), ZooKeys 1197, pp. 1-11 : 1

Paracoccus wui Zhang sp. nov.

Figs 3 , 4

Materials examined.

Holotype: 1 ♀ (mounted singly on a slide), China, Jiangxi, Lushan National Nature Reserve [29°33′N, 115°57′E] / under bark crack of Dalbergia hupeana Hance ( Fabaceae ) / 14.ix.2021, coll. Jiang-tao Zhang (CFJAU) . Paratypes: 8 ♀♀ (mounted singly on 8 slides), same data as holotype (6 CFJAU, 2 SWFU) .

Etymology.

The species is named after Dr San-an Wu (Beijing Forestry University, Beijing, China), who has made important contributions to the study of Chinese scale insects and has selflessly helped the first author.

Description.

Live adult female (Fig. 3 ). Body of mature adult female elongate-oval, covered with white, mealy wax; posterior of body with a short, white ovisac formed of tangled wax filaments.

Slide-mounted adult female (Fig. 4 , n = 5). Body elongate-oval to broadly oval, 2.8-3.4 mm long and 1.9-2.5 mm wide. Anal lobes moderately developed, dorsal surface of each lobe with a small, slightly sclerotized area; ventral surface with long apical seta, each seta 225-240 µm long, and anal lobe bar present forwards from apical seta. Antennae each 355-458 µm long with 8 segments, length of segments (in µm): I 42.5-55.0, II 50.0-62.5, III 47.5-62.5, IV 25-35, V 27.5-50.0, VI 30.0-37.5, VII 37.5-50.0 and VIII 87.5-110.0. Eye spot located on body margin lateral to antennal base. Clypeolabral shield 163-213 µm long and 150-195 µm wide. Labium 178-225 µm long and 87.5-100.0 µm wide, 1.03-1.18 times as long as clypeolabral shield. Legs well developed; claw stout, without a denticle; both tarsal digitules and claw digitules apically knobbed, longer than claw; with translucent pores present on anterior and posterior surfaces of hind coxa (Fig. 4E ) and on posterior surface of hind tibia (Fig. 4F ). Hind leg measurements (in µm): coxa 80-113, trochanter + femur 275-378, tibia + tarsus 283-360, claw 27.5-32.5. Ratio of lengths of hind tibia + tarsus to trochanter + femur 1: 0.95-1.04, ratio of lengths of hind tibia to tarsus 1: 1.78-2.35. Circulus nearly quadrate, 115-145 µm long and 125-188 µm wide, situated between abdominal segments III and IV, divided by an intersegmental line. Anterior and posterior ostioles present, each lip with some trilocular pores and 1-5 setae. Anal ring 87.5-112.5 µm wide, bearing 6 long setae, each 120-145 µm long; occasionally 2 short setae present between long setae. Cerarii numbering 5-8 recognisable pairs on abdomen, sometimes also possibly 1-3 pairs discernible on thorax and head. Anal lobe cerarii (Fig. 4I ) each containing 2 conical setae, each seta 16-20 µm long and 7-8 µm wide at base, 2-5 auxiliary setae and 22-26 trilocular pores, all situated on a small slightly sclerotized area. Anterior abdominal cerarii (Fig. 4J ) each usually containing 2 smaller conical setae, 4-8 trilocular pores, and sometimes with small slightly sclerotized at setal bases; the setae in anterior abdominal cerarii sometimes widely spaced, or each reduced to only 1 conical seta, or replaced by 1 or 2 stout setae. Cerarii on thorax and head difficult to recognize because some marginal dorsal setae sometimes associated with 2-4 trilocular pores near setal bases, which can be confused with a cerarius; if cerarii present, each often with a pair of stout setae similar to those on dorsum, but recognisable as cerarius by a small concentration of trilocular pores, and sometimes the ocular cerarii (C3) present, each with 3 or 4 slender setae. Discoidal pores (Fig. 4D ) of varying sizes, with larger pores each usually wider than a trilocular pore (in one paratype most larger pores about same diameter as a trilocular pore and only a few pores wider than a trilocular pore), scattered on dorsum and venter.

Dorsum. Setae (Fig. 4K ) stout with flagellate tips, sometimes bifurcate; larger setae, each 42.5-62.5 µm long and sometimes with 1 or 2 trilocular pores near setal base, and shorter setae, each 17.5-37.5 µm long. Trilocular pores (Fig. 4C ), each 3-4 µm wide, evenly distributed. Multilocular disc-pores absent. Oral rim tubular ducts (Fig. 4L ) very few, totaling 1-8 in available specimens, each about 9 µm long and 4-5 µm wide, with rim 8-9 µm in diameter, mainly present medially, submedially or submarginally on thorax and anterior abdominal segments, sometimes singly next to abdominal cerarii C11, C15 and C17, ducts usually absent from medially and submedially areas of abdominal segments IV-VIII. Oral collar tubular ducts usually absent from dorsum, occasionally 1 type of duct, similar to large type of oral collar tubular ducts on venter, singly present marginally or submarginally on thorax, or abdominal segment I, or abdominal segment IV.

Venter. Setae (Fig. 4A ) relatively long and flagellate, longest setae present on medial area of head and posterior abdominal segments, each 100-138 µm long, and shorter setae, each 30.0-62.5 µm long. Cisanal setae each 100-113 µm long; obanal setae each 95-105 µm long. Trilocular pores similar to those on dorsum, evenly distributed. Multilocular disc-pores (Fig. 4H ), each 7-8 µm in diameter, present around vulva, usually in double rows at posterior edges of abdominal segments V-VII, and in single or double rows at the posterior edge of abdominal segment IV; others distributed at anterior edges of abdominal segments V-VII; in addition, a few pores located on submargins of abdominal segments and sometimes also present on abdominal segment III; also scattered pores present on medial and submedial areas of thorax. Oral collar tubular ducts of 2 main sizes present: larger type (Fig. 4B ), each about 8 µm long and 3.5-4.0 µm wide, present mainly on medial areas of abdominal segments III-VII, in marginal groups on thorax and abdomen, also opposite each anterior coxa; and smaller type (Fig. 4G ), each about 6 µm long and 2.5-3.0 µm wide, present mainly on medial areas of abdominal segments II-VII, also sparsely present in marginal areas together with large ducts, and occasionally in medial areas of thorax.

Host plant.

Fabaceae : Dalbergia hupeana Hance.

Distribution.

China (Jiangxi).

Remarks.

Paracoccus wui sp. nov. is similar to P. keralae Williams, 2004 in having only a few dorsal oral rim tubular ducts; it differs from the latter (character states of P. keralae given in parentheses) by having: (i) ventral oral collar tubular ducts absent from margins of the head (present); (ii) multilocular disc-pores usually in double rows at posterior edges of abdominal segments V and VI (in single rows); and (iii) larger discoidal pores usually each wider than a trilocular pore (narrower than a trilocular pore).

Paracoccus wui also resembles P. neocarens (Lit, 1992) (based on the redescription and illustration by Williams (2004)) in possessing some large discoidal pores and a reduced number of dorsal oral rim tubular ducts; it differs from the latter (character states of P. neocarens in parentheses) in having: (i) ventral oral collar tubular ducts absent from margins of the head (present between antennal bases); and (ii) multilocular disc-pores usually in double rows at posterior edges of abdominal segments V and VI (in single rows).

Figures

Figure 3. Live adult female of Paracoccus wui Zhang, sp. nov. in bark crack of Dalbergia hupeana Hance (Fabaceae).

Figure 4. Adult female of Paracoccus wui Zhang, sp. nov. A ventral seta B large-type oral collar tubular duct C trilocular pore D discoidal pores E hind coxa F hind tibia G small-type oral collar tubular duct H multilocular disc-pore I anal lobe cerarius (C 18) J cerarius on abdomen K dorsal seta L oral rim tubular duct.