20


Journal of Paleontology 92(1):14–25


sclerite straddles as many as four annuli (Fig. 5.4). The small plates and the large spinose sclerites are all hollow internally.


Materials.—Five specimens, NIGP160438–160442.


Measurements.—Specimen NIGP160438 (Fig. 5.1) is about 1.5 mm long, and each small plate is about 240 μm long. The large spinose sclerite in NIGP160442 (Fig. 5.5, 5.6) is about 580 μm long, representing the trunk part of a very large individual.


Remarks.—A fragment (NIGP160414, Zhang et al., 2015, fig. 3h) was originally assigned to Eokinorhynchus rarus and


was hypothesized to represent the trunk part of a very large individual. The small plates of E. rarus are rectangular in shape and never protrude into spines, but the small plates of NIGP160414 are spinose. Thus, we move NIGP160414 to Form B, and Form B possibly represents a new scalidophoran animal,


different from E. rarus and Form A. The second large spinose


sclerites of E. rarus (Fig. 3.1) are about 180 μm long, and the first large spinose sclerite of Form A is about 140 μm long. By contrast, the large spinose sclerites of NIGP160442 (Fig. 5.5) are 580 μm long. If the body length is proposed to be positively correlated with the size of the large spinose sclerite, Form B probably reached a centimeter-scale body length.


Form C Figure 6


Occurrence.—Xinli section, Nanjiang County, northern Sichuan Province, SouthChina (Yang et al., 1983; Zhang et al., 2015). Small shelly fossils, Anabarites trisulcatus–Protohertzina anabarica Assemblage Zone, Xinli Member, Dengying Formation, Cambrian Fortunian Stage (Steiner et al., 2007; Peng et al., 2012).


Description.—A fragmentary trunk part of a scalidophoran worm, with a length of 2.3 mm. The preserved trunk part bears


Figure 6. SEM images of Form C from the lower Cambrian Xinli section. (1) A fragment with densely spaced annuli, NIGP160493; (2) enlargement of the area in the white rectangle in (1); (3) enlargement of the area in the black rectangle in (1). (1) Scale bar = 500 μm; (2) scale bar = 270 μm; (3) scale bar = 122 μm.


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