FIGURE 1. Microraptor gui.

From the following article:

Four-winged dinosaurs from China

Xing Xu, Zhonghe Zhou, Xiaolin Wang, Xuewen Kuang, Fucheng Zhang and Xiangke Du

Nature 421, 335-340(23 January 2003)



a, Skeleton of Microraptor gui (IVPP V13352). Scale bar, 5 cm. b, A computerized tomography (CT) image of the major part of the IVPP V13352. Scale bar, 13 cm. Scanning was performed using a CT machine (LightSpeed Qx/i) at an energy level of 140 kV and 250 mA. The images were collected at a size of 800 times 600 pixels. On the basis of comparison of adjacent fracture-face geometries, density of adjacent pieces, and continuity across fractures of bones (see ref. 45), we find a few pieces are unverified or assembled in the wrong position (marked by asterisks). For example, one small piece containing the anterior end of the skull and a medium-sized piece near the right forelimb preserving some arm feathers are dubious. The latter is actually from the counter slab. However, the CT information suggests that most pieces lie together in their natural relationships, including pieces containing the forelimb, hindlimb and associated feather impressions. This is concordant with microscopic observations. c, A reconstruction of M. gui showing the morphology and distribution of the pennaceous feathers. Scale bar, 6 cm.