Lanarkia, TRAQUAIR, 1898

Burrow, Carole Jan, Murphy, Michael & Turner, Susan, 2023, Late Silurian to earliest Devonian vertebrate biostratigraphy of the Birch Creek II section, Roberts Mountains, Nevada, U. S. A., PaleoBios 40 (4), pp. 1-32 : 22

LANARKIA TRAQUAIR, 1898

Type species — Lanarkia horrida Traquair, 1898 .

? LANARKIA SP.

( FIG. 7C ; TABLE 1 ; SUPPL. 1, FIG. 11)

Referred specimens and Remarks —At least two possible scales from BC II section: one from level 458.67’ (139.8 m), one from level 527.25’ (160.7 m) ( Fig. 7C ). Lanarkia species are known mainly from earlier Silurian rocks in Scotland, mainland Europe, and arctic Russia, as well as in arctic Canada ( Märss et al. 2007). The scale from 527.25’ is most like those called Thelodus traquairi by Gross (1967), originally “ Lanarkia costata ” of Gross, 1947, from the north German Beyrichienkalk (Bey. 1, early Přidolí) and ones from Poland (late Přidolí; Gross 1947, Märss 1997), which have been referred to Lanarkia ( Märss et al. 2007) .

Figures

Figure 7. Thelodont scales from the uppermost Silurian of the Birch Creek II section, all level 430.5' except B, C, G, K, L, P, Q. A. Trimerolepis sp. cf. T. tricava. UCR 10746-43 in crown view. B. Trimerolepis sp. AMF97876 (Parkes 1995, fig. 22.19, 20) from level 503’, base view. C.?Lanarkia sp. UCR 944-20 (level 527.25’) in lateral view. D.?Turinia sp. UCR10746-19, showing taphonomic effects and ultrasculpture, in crown view. E-J. Nikolivia spp. E. UCR 10746-13 with cell pattern on surface in crown view; F, UCR 10746-20 in crown view; G, AMF97875 (Parkes 1995, fig. 22.17, 18) from level 402' with possible bite marks, in crown view; H, UCR 10746-27 in ventral basal view; I, UCR 10746-25 showing taphonomic effects in crown view; J, Nikolivia sp. cf. N. auriculata, UCR 10746-18 in crown view. K, L. Apalolepis sp. AMF97872 (level 503’) (Parkes 2005, fig. 22.11, 12), crown and basal views. M-O. Talivalia sp. cf. T. elongata. M, UCR 10746-17 in crown view; N, UCR 10746-37 in crown view; O, UCR 10746-21 in lateral view. P-S. Barlowodus sp. cf. B. tridens. P,Q, AMF97874 (level 875’) in crown and basal views (Parkes 2005, fig. 22.15, 16). R, S, UCR 944-21 (level 527.25') in laterocrown view, closeup in S showing striated ultrasculpture. Scale bars=0.2 mm; anterior to left or top, otherwise arrow points to anterior. See Table 1 for meterage.