Zhao et al.—Early Cambrian scleritomes of Chancelloriida, China 92(6):955–971


965


Figure 9. Nidelric gaoloufangensis n. sp. (1) YN-GLF-PAL-17, white arrow points to the area where marginal spines are normal or skewed to the body margin, frame 1 shows the spines at the abapical end; (2) detail of (1) (position marked by frame 2); (3) detail of (1) (position marked by frame 3), white arrow points to the broken mark on the top of a node-like structure. (4) detail of (1) (position marked by frame 4), white arrow points to the longitudinal groove in the spine. Scale bars=5mm for (1), 1mm for (2, 3), 0.5mm for (4).


project towards left and right, which are apparently not the classic feature of a tuft. Besides, most of the marginal spines project towards the tuft-like structure, and this is consistent with the general sclerite orientation of chancelloriids. All these features strongly suggest that the narrower end with the tuft-like structure should be the apical end. But still another problem remains: no stalk or basal attachment, which could indicate a definite abapical end, has been found in either species of Nidelric.


Discussion


Preservation of Nidelric gaoloufangensis n. sp.—N. gaol- oufangensis is preserved in yellowish green mudstones and, due to iron oxide, the fossils show reddish-brown staining on the body surface, which is one of the characteristic preservational features of Guanshan fossils (Hu et al., 2010). The body is lat- erally compressed with folds, reliefs, and pits being clearly discernible on the surface.


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