Pachyscia dilatata ( Chen & He, 2004 )

Ho, George Wai-Chun, 2012, Notes on the genera Sinophasma Günther, 1940 and Pachyscia Redtenbacher, 1908 (Phasmatodea: Diapheromeridae: Necrosciinae), with the description of four new species from China, Zootaxa 3495, pp. 57-72: 68-69

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Pachyscia dilatata ( Chen & He, 2004 )


Pachyscia dilatata ( Chen & He, 2004) 

( Figs. 17–18View FIGURES 17 – 20)

Asceles dilatatus, Chen & He, 2004: 49  , fig. 5 a–c. Hennemann, Conle & Zhang, 2008: 19.

Chen & He, 2008: 117, figs. 82 a–c.

Type-material. Holotype Ƥ, 350–1400 m., Daqingshan, Guangxi Autonomous Region, China, 16.IX. 1958, Fang Yiguang (ZSU), examined.

Other material examined. 33, 1Ƥ, Daqingshan, Guangxi Autonomous Region, China, 16.IX. 1958, Fang Yiguang (ZSU).

Diagnosis. The male of this specie is similar to P. heishidingensis  sp. nov. [Guangdong, China] but differs by olive brown colouration, small size, slimmer body, broadly emarginated mesonotum medially, shorter cerci and strongly dilated anal segment.

Description. Male ( Figs. 17–18View FIGURES 17 – 20). General colouration of body, legs, tegmina and costal region of alae olive brown. Body slender and slim.

Head: Chocolate brown. Genae with a yellow postocular band reaching back of head. Oblong, 1.5 x longer than wide. Smooth. Vertex slightly with a flattened elevation between the bases of antennae. Occiput flat. Eyes prominent and rounded, rufous brown. Antennae long, but not projecting over end of abdomen, some segments ringed; the first segment cylindrical, 1.5 x length of second segment.

Thorax: Olive brown, with a yellow oval spot at the posterior of mesopleurum. Granulated. Pronotum almost as long as head, anterior margin gently curved inward, and with two mini granules, transverse and longitudinal sulcus crossing before middle. Mesonotum broadly emarginated medially, posterior margin about 1.5 x wider than anterior margin, sparsely covered with small granules, median carina distinct. Mesopleurum and mesosternum with very few granules. Metapleurum smooth, with a yellow spot.

Abdomen: Brown, with short setae. Very slender. Second to fifth tergites equal in length. Parallel-sided from second to sixth tergites. Seventh tergum expanded posteriorly after middle. Ninth tergum as long as eighth tergum, with a white spot near the posterior. Anal segment elongate, almost 4 x length of ninth tergum, hind margin with deep triangular emargination, median carina distinct; broad at base, constricted medially, broadened in second half and strongly dilated into a rounded lobe postero-laterally, hind margin of the lobes truncate. Poculum cup-shape, hind margin rounded. Cerci cylindrical, short and straight, broad at base, tapering posteriorly, not projecting over the end of poculum, with lightly furcate apices.

Legs: Brown to olive brown, all femora and tibiae with dark tip. The base of all tibiae yellow. All tarsi light brown. Lacking distinct armature. With long bristles. Medio-ventral carina of metafemora slightly with a flattened lobe at base. Profemora as long as protibiae, curved at base. Mesotibiae as long as mesonotum. Wings: Tegmina chocolate brown, short and oval, truncate at hind margin, with a yellow spot at base and another yellow spot near the hind margin. Alae brown, reaching sixth tergum, with a yellow spot and a broad yellow stripe near the base of the costal region.

Measurements in table 4.

Notes. A full measurement of the holotype female is given ( Table 4). Detailed description of the female was provided by Chen and He (2008: 117). The male is described for the first time.

Distribution. Guangxi (Daqingshan), China.

TABLE 4. Measurements of Pachyscia dilatata (Chen & He, 2004)

Lengths (mm) Female (HT) Male
Body 87 67
Head 6 3
Antennae 70 70
Pronotum 5 3
Mesonotum 16 12
Metanotum including median segment 11 8
Profemora 22 20
Mesofemora 13 13
Metafemora 20 20
Protibiae 22 20
Mesotibiae 14 12
Metatibiae 20 18
Tegmina 6 3
Alae 40 34














Pachyscia dilatata ( Chen & He, 2004 )

Ho, George Wai-Chun 2012


Asceles dilatatus

Hennemann 2008: 19Chen 2004: 49