Zemes un vides zinātnes Earth and Environment Sciences - Latvijas ...
Zemes un vides zinātnes Earth and Environment Sciences - Latvijas ...
Zemes un vides zinātnes Earth and Environment Sciences - Latvijas ...
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H.-P. Schultze, T. Marss. Revisiting Lophosteus<br />
63<br />
Fig. 2. Lophosteus superbus; head plate GIT 232-16; upper Pridoli, Upper Silurian; Ohesaare<br />
cliff, Saaremaa, Estonia. A, external side; B, inner side.<br />
with strong ridgelets. The angle between crest <strong>and</strong> ridgelets at aro<strong>un</strong>d 20° is lower than<br />
in L. superbus. – This is the oldest record of Lophosteus.<br />
Lophosteus canadensis n. sp.<br />
Fig. 3<br />
1998 Lophosteus sp. — Märss et al.: 60, 62.<br />
1998 Lophosteus spp. — Märss et al.: fig. 4.<br />
2000 Lophosteus sp. — Märss: 68.<br />
Holotype: scale UALVP 447 66 (Fig. 3 A, B).<br />
Etymology: Named after region of origin (Canada).<br />
Type locality: 141.0 m in the Read Bay southern section, Cornwallis Isl<strong>and</strong>, Arctic<br />
Canada (Märss et al. 1998).<br />
Type horizon: Barlow Inlet Formation, Pridoli, Upper Silurian.<br />
Additional material: two more scales, one scale is figured herein (UALVP 447 85;<br />
Fig. 3 C), one short spine (UALVP 447 90; Fig. 3 D), one plate (UALVP 447 65; Fig.<br />
3 E, F), <strong>and</strong> head plate <strong>and</strong> tooth plate fragments.<br />
Localities: Two samples at 87.0 m in the Read Bay southern section, Cornwallis Isl<strong>and</strong>,<br />
Arctic Canada (Märss et al. 1998).<br />
Horizon: Barlow Inlet Formation, Pridoli, Upper Silurian. The material occurs together<br />
with conodonts Ozarkodina confluens, Oz. excavata, ?Ligonodina confluens,<br />
Pelekysgnathus sp,. <strong>and</strong> Ctenognathodus sp. (Männik in Märss et al. 1998: fig. 4).