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68 ADVANCES IN PALAEOICHTHYOLOGY ridges cover the scale, the ridgelets run nearly parallel on the crest, barely reaching the posterior end of the crest. The angle of the ridgelets on the lateral sides changes from 10° to nearly vertical to the crest posteriad on the lateral sides. The lower part of each of the ridgelets bears a nodular serration increasing in number with the size of the tubercles (Fig. 5 C). One tessera with a vertical tubercle (Fig. 5 B) is assigned to the species, because it shows fine ridgelets running to the tip in addition to stronger ridgelets with nodules located more basally. The ridges on the spines have parallel ridgelets on their anterior part. Comparison: L. uralensis is closest to L. ohesaarensis; the ridgelets do not form chevrons in L. ohesaarensis in contrast to L. uralensis and L. canadensis. L. superbus has broader ridges with strong ridgelets that form a distinct angle to the crest. The serration of the lower part of the ridgelets is unique to L. ohesaarensis. Lophosteus sp. indet. 2000 Lophosteus? sp. — Turner et al.: 492; fig. 3 F. Material: A section of a single spine QMF35785 (Turner et al. 2000: fig. 3 F). Locality: Between Gray Creek and Basalt Bore, Broken River district, north Queensland, Australia. Horizon: Pedavis pesavis - Eognathodus sulcatus conodont zones, Shield Creek Formation, upper Lochkovian/lower Pragian, Lower Devonian. Description: Turner et al. (2000) cited the specimen in connection with the description of microvertebrates from the Broken River district, Queensland. A short piece of one spine is preserved. It shows five arch-like tubercles with a smooth crest and with ridgelets on the sides; smaller pointed tubercles are present on the side of the spine. Lophosteus uralensis n. sp. Fig. 6 1997 Actinopterygii gen. et sp. A — Märss: pl. 5, figs 14-16. 1997 Osteichthyan — Märss: 35. Holotype: scale GIT 297-62 (= Pi 7236; Märss 1997: pl. 5, fig. 15). Etymology: Named after region of origin (Ural). Additional material from the type locality: 2 scales (GIT 297-63 + 297-61 [= Pi 7237 + 7238; Märss 1997: pl. 5, figs 16 + 14]) Type locality: locality 67, Kuba River, Ufa amphitheatre, western slope of Central Ural. Type horizon: lower Lochkovian, Lower Devonian. Diagnosis: Ridgelets of ridges reach to top of the crest where they join and form chevrons; oblique angle between crest and ridgelets (around 10°); anterior overlapped field pustulate. Description: Scales of the new species are only known from the Central Ural. They show the main features of Lophosteus, pustulate anterior overlapped field, separated ridges of different size on the free field and a narrow dorsal overlapped area without a
H.-P. Schultze, T. Marss. Revisiting Lophosteus 69 Fig. 5. Lophosteus ohesaarensis n. sp.; upper Pridoli, Upper Silurian; Ohesaare cliff, Saaremaa, Estonia. A, Scale, GIT 382-122, holotype; B, tessera with one tubercle, GIT 382-89; C, scale, GIT 382-123. SEM pictures, scale bars equal 100 µm. defined peg. The holotype, a scale of the right flank (Fig. 6 A), shows three long ridges that, notably, arise and partly extend beyond the posterior border of the scale. Three shorter ridges lie between the larger ridges. The ridgelets extend to the crest, forming
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LATVIJAS UNIVERSITĀTES RAKSTI 679.
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LATVIJAS UNIVERSITĀTES RAKSTI 679.
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Contents Ervīns Lukševičs and Ģ
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ACTA UNIVERSITATIS LATVIENSIS, 2004
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Ervīns Lukševičs, Ģirts Stinkul
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Olga Afanassieva. Microrelief on th
Page 17 and 18: Olga Afanassieva. Microrelief on th
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Page 47 and 48: C.G.Miller, T. Marss, H. Blom. New
Page 57 and 58: ACTA UNIVERSITATIS LATVIENSIS, 2004
Page 59 and 60: H.-P. Schultze, T. Marss. Revisitin
Page 67: H.-P. Schultze, T. Marss. Revisitin
Page 81 and 82: O.A. Lebedev. A new tetrapod from R
Page 101 and 102: E. Lukševičs, I. Zupiņš. Sedime
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E. Lukševičs, I. Zupiņš. Sedime
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J. Valiukevičius. Silurian acantho
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V. Pernegre, V. Dupret. Biostratigr
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Ž. Žigaite. New telodont from Tuv
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