Zhang et al.—Cambrian Fortunian scalidophoran worms in South China


(with larger diameter) is opposite to the anterior part of the worm trunk. The orientations of the tube and Form A do not match up, and it supports the nonbiological connection between them. Form A has densely spaced trunk annuli, different from the


20 annuli of Eokinorhynchus rarus. Form A also differs from Eopriapulites sphinx Liu and Xiao in Liu et al., 2014 because the latter does not have any sclerites or spines on the trunk (Shao et al., 2016). Therefore, Form A probably represents part of the body of a new species.


Form B Figure 5


2015 Eokinorhynchus rarus Zhang et al., fig. 3h–i 2015 Unnamed Form I; Zhang et al., fig. 4a, b


Occurrence.—Xinli section, Nanjiang County, northern Sichuan Province, South China (Yang et al., 1983; Zhang et al., 2015).


19


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.—The illustrated specimens might represent dif- ferent trunk parts of the same animals, because of the similar morphology and arrangement mode of the small plates, but in different ontogenetic stages because of the size difference of the sclerites and plates. The tightly sutured small plates are aligned in three rows in NIGP160439 (Fig. 5.2), four rows in NIGP160438 (Fig. 5.1), and eight rows in NIGP160441 (Fig. 5.4). These rows with small plates represent annuli of the trunk. The small plates are much longer than wide, have an expanded base, and protrude distally into a spine. Sometimes, the distal spines are broken, leaving a hollow hole centrally (Fig. 5.1). The large spinose sclerites have an expanded base, which may be elliptical, and in one specimen the large spinose


Figure 5. SEM images of Form B from the lower Cambrian Xinli section. (1) NIGP160438, with four annuli, each bearing densely sutured small plates; (2) NIGP160439, a fragment with a single large spinose sclerite and a few small plates; (3) NIGP160440, with a pair of large spinose sclerites and a few small plates; (4) NIGP160441, with eight annuli and a large spinose sclerite loosely covering 4 annuli; (5, 6) NIGP160442, opposite views, with two large spinose sclerites basally attached to each other and a few small plates in between. ls = large spinose sclerite; spl = small plate. Scale bar = 500 μm.


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76  |  Page 77  |  Page 78  |  Page 79  |  Page 80  |  Page 81  |  Page 82  |  Page 83  |  Page 84  |  Page 85  |  Page 86  |  Page 87  |  Page 88  |  Page 89  |  Page 90  |  Page 91  |  Page 92  |  Page 93  |  Page 94  |  Page 95  |  Page 96  |  Page 97  |  Page 98  |  Page 99  |  Page 100  |  Page 101  |  Page 102  |  Page 103  |  Page 104  |  Page 105  |  Page 106  |  Page 107  |  Page 108  |  Page 109  |  Page 110  |  Page 111  |  Page 112  |  Page 113  |  Page 114  |  Page 115  |  Page 116  |  Page 117  |  Page 118  |  Page 119  |  Page 120  |  Page 121  |  Page 122  |  Page 123  |  Page 124