Lapworthella shodakensis ( Lochman, 1956 )

Skovsted, Christian B. & Peel, John S., 2007, Small shelly fossils from the argillaceous facies of the Lower Cambrian Forteau Formation of western Newfoundland, Acta Palaeontologica Polonica 52 (4), pp. 729-748 : 742-743

Lapworthella shodakensis ( Lochman, 1956)

Fig. 6G .

1956 Stenothecopsis shodakensis sp. nov.; Lochman 1956: 1394, pl. 4: 1, 2.

1984 Lapworthella shodakensis ( Lochman, 1956) ; Landing 1984: 1395, figs. 2A–O, 3D, 5A–E.

1996 Lapworthella shodakensis ( Lochman, 1956) ; Landing and Bartowski 1996: fig. 9.18, 19

2006 Lapworthella shodakensis ( Lochman, 1956) ; Skovsted 2006a: 1103, fig. 10.14–17.

Holotype: USNM 125749 , Cambridge , New York State.

Material.— NFM− 713 from sample JSP1982−01.

Discussion.— Lapworthella shodakensis is common in the Lower Cambrian of the Taconic Allochthon ( Landing 1984), but also occurs in the Bastion Formation of North−East Greenland. Although details of surface ornamentation are obscured by diagenetic minerals, rare lapworthellid sclerites from the Forteau Formation of Newfoundland appear identical to specimens of L. shodakensis from the Bastion Formation in the rapid lateral expansion and the coarsely annulated surface.

Stratigraphic and geographic range.—Late Early Cambrian of New York, North−East Greenland and western Newfoundland.

Figures

Fig. 6. Problematic taxa from the Lower Cambrian, Forteau Formation (Western Newfoundland). A, B. Chancelloria sp. A. Phosphatic internal mould, NFM−707; B. Phosphatic internal mould viewed from basal facet, NFM−708. C, D. Archiasterella sp. C. NFM−709 from ICS 1421, phosphatic internal mould; C1, lateral view; C2, viewed from basal facet. D. NFM−710, oblique view of phosphatic internal mould. E, F. Hyolithellus sp. E. NFM−711. F. NFM−712. G. Lapworthella shodakensis (Lochman, 1956). NFM−713, dorso−ventrally flattened sclerite; in lateral (G1) and dorsal (G2) views. All specimens from JSP 1982−01 unless otherwise stated. Scale bars 200 ̊m.