Female scale. White, suborbicular or long pyriform. Exuviae terminal. Male scale. Same colour as female scale, elongate.

Adult female. Body shape varied, fusiform, olivary or elongate; derm membraneous except for the marginal of pygidium; mesothorax, metathorax, and abdominal segments I-III produced laterally. Cephalothorax. Antennae each with a seta. Anterior spiracles each usually with a cluster of trilocular pores, posterior spiracle each associate with or without trilocular pores. Pygidium. With 2 or 3 pairs of lobes. Median lobes (L1) well-developed, much larger than lobules of lateral lobes, zygotic basally, with a distinct pair of marginal setae between lobes. In general, L1 divide into two types: bark-type, individuals occur on bark and prominent median lobes; leaf-type, those on leaves and sunken into the pygidium. Second lobes (L2) much smaller than the L1, bilobed, divided into inner lobule and outer lobule, outer lobule usually smaller than inner, in some species much reduced. Third lobes (L3) smaller than L2, bilobed or represented by serrations along the body margin in some species. Gland spines. Gland spines developed, usually single on abdominal segments VI-VIII, becoming shorter into conical on anterior segments which called gland tubercles. Ducts. Dorsum with 2-barred ducts, forming submedial and submarginal rows on abdominal and pygidium, usually as same size as marginal macroducts. Ventral microductsscattered. Anal opening. Anal opening close to the base of or situated about the centre of the pygidium. Perivulvar pores quinquelocular, in five groups.

This genus is very closely related to Chionaspis Signoret, 1868 and Aulacaspis Cockerell, 1893 in feature of pygidial lobes and dorsal ducts present on pygidium and abdomen, but can differ from these genus: presence of a pair of setae between the median lobes in Pseudaulacaspis, but absent in Chionaspis and Aulacaspis.

Holotype: adult female:CHINA:Guizhou Prov., Zhenyuan County, 13. viii. 1996, Zeng (NWAFU).

Paratypes: 2 adult females: same data as the holotype (NWAFU).

, n=3. Adult female. Appearance in life not recorded. Slide-mounted adult female 1755-1910 μm long (holotype 1910 μm long); 930-970 μm wide (holotype 931 μm wide), body outline fusiform, derm membranous except for pygidium. Normally widest at metathorax and abdominal segment I, lateral abdominal lobes well-developed, with large gland spines on the margin of prepygidial and pygidial segments. Cephalothorax. Antennae each with 1 long fleshy seta, distance between antennae is 111 µm. Anterior spiracle each with 12-31 trilocular pores in a cluster, posterior spiracle each with 11-17 trilocular pores. Pygidial Lobes. With 3 pairs of lobes; L1 well-developed, zygotic basally, protruding from pygidial margin, with small serrations along both margins, with a pair of setae between lobes; L2 bilobate, inner lobule rounded, much larger than outer lobule; L3 bilobate, slightly smaller than L2, inner lobule rounded, outer lobule margin serrate; L4 represented by serrations along the body margin. Gland spines. Large, arranged singly on pygidial segments VI-VIII but with 2 on segment V, 4-5 on segment IV, 5-6 on segment III, 5 on segment II, anterior spines smallest (on segment II). Gland tubercle present submarginally, with 2 on prothorax, 9-11 on mesothorax, 5-6 on metathorax, 6 on segment I. Ducts. Marginal macroducts, 2-barrel-shaped, 1 present between L1 and L2, 2 on segment VI, 1 on segment V. Dorsal macroducts on pygidium about same size as marginal macroducts, becoming slightly smaller on anterior abdomen, 2-barrel-shaped, arranged segmentally in submedian and submarginal rows; submedian: 3-6 on segment I, 4-5 on II, 4-6 on III, 7-13 on IV, 3-4 on V; submarginal: 11-14 on I, 11-12 on II, 10-11 on III, 10-11 on IV, 8-9 on V. Dorsal ducts scattered on margin of thorax, smaller than those on abdomen, 2-barrel-shaped, with 8 or 9 on prothorax, 15-17 on mesothorax, 14 or 15 on metathorax. Dorsal ducts on head as big as ventral microducts, very smaller than dorsal ducts present on thorax, scattered distribution. Ventral microductsscattered, numerous on head and with several microducts on submargin of pygidium and prothorax and submedian of abdomen, meso- and metathorax. Anal opening, small, 15-17µm in diameter, positioned 214 µm from posterior margin. Perivulvar pores in 5 groups, 31-37 in the median group, 33-44 in the anterolaterally and 45-48 in the posterolaterally.

This species is similar to Pseudaulacaspis chinensis (Cockerell, 1896) in body shape and the number of pygidial lobes, but can be distinguished by the following features (those for Pseudaulacaspis chinensis in brackets): 1) dorsal macroducts absent on abdominal segment VI (present); 2) L1 prominent the pygidium (sunken into the pygidium).

Host: Spermadictyon suaveolens.

The specific epithet is named after Zhenyuan, the type locality.

China (Guizhou).