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 ...
52 ADVANCES IN PALAEOICHTHYOLOGY Fig. 3. SEM pictures of fragments of scales in external view unless stated. All scale bars are 0.2 mm. A-F, Trimpleylepis concatenata gen. et sp. nov., fragments of scales from Ohesaare Borehole, Saaremaa, Estonia, depth 94.32-94.40 m, Ludfordian, Upper Silurian. A, GIT 384-1; B, GIT 384-2; C, GIT 384-3, D; GIT 384-4; E, GIT 384-5; F, GIT 384-6. G-H. Silmalepis cf. erinacea Blom, Märss and Miller, 2002, scale fragment from Man Brook, upper part of Prídolí Series, Upper Silurian, NHM P 66018(1): G, scale in external view; H, close up of sculpture. I- L, Family Rhyncholepididae Kiær, 1924 gen. et sp. indet., fragments of scales from Gardner’s Bank, c. 7m below Psammosteus Limestone, U. Downton Group, Prídolí, Silurian. I, GIT 384- 7. J; GIT 384-8; K, scale now sectioned and illustrated in Fig. 2D; L. GIT 384-9, visceral view.
C.G.Miller, T. Marss, H. Blom. New anaspid material from Britain and Estonia 53 (Fig. 1F) to more elongate in the holotype (Fig. 1C) and the Estonian material certainly falls within these variations. However, we prefer to classify the Estonian material under T. concatenata gen. et sp. nov. which has only one row of tubercles per scale, and three of the six scales are saddle shaped in cross section (Fig. 2E), whereas T. juncta gen. et sp. nov. scales show two to four rows of tubercles joined by more prominent ridges (Figs 1, 2C). The Ludlow age of T. concatenata gen. et sp. nov. suggests that the range of the genus Trimpleylepis should be Ludlow-Prídolí. Family RHYNCHOLEPIDIDAE Kiær, 1924 Silmalepis cf. erinacea Blom, Märss and Miller, 2003 Fig. 3G-H Material. One broken scale from Man Brook from uppermost Prídolí, Upper Silurian, Man Brook, near Trimpley, Shropshire, U.K. Description. Scale with wide smooth overlapped area; groove extends entire length of scale close and parallel to the sculpture margin on the main scale area. External sculpture of closely spaced fine tubercles of variable diameter followed by relatively closely spaced ridges that point into the gap between the following row. The ends of ridges are broken in this specimen but three distinct rows of ridges can be seen across the scale. Visceral side with single rib and no evidence of vascular canal openings. No histological sections have been made due to lack of material. Remarks. Precise identification of this scale is not possible due to lack of material and the preservation of the scale, which has broken spine-like ridges. Septentrionia mucronata Blom, Märss and Miller, 2002 has spine-like ridges that point between the next set of ridges, as the spines do in the material figured here. S. mucronata is also similar as it has a wide overlapped area, but it differs in having a narrow well developed ridge with granular sculpture (Blom et al. 2003, fig. 45g-h) in the position where there is a groove developed in the scale illustrated here. In our opinion the scale figured here (Fig. 3G, H) is much closer to Silmalepis erinacea Blom, Märss and Miller, 2002 that also has a coarse tuberculated to granular sculpture to the anterior of the main area of the scale (Blom et al. 2002, fig. 34a). The long spines inclined at a low angle to the main scale area of Silmalepis (Blom et al. 2003, fig. 34b) look to have broken off in the material figured here. The broken spines also have a concave upper surface as they do in S. erinacea. As the spines are broken, and because the scale figured here has a much broader overlapped area than typical S. erinacea, we consider the material certainly belongs within Silmalepis but identify S. erinacea with doubt. The material figured here extends the range of Silmalepis from mid Ludlow (Blom et al. 2003, fig. 10) to mid Ludlow-late Prídolí. RHYNCHOLEPIDIDAE gen. et sp. indet. Figs 2B, D; 3I-L Material. One intact scale, one small fragment, and two fragments that were used for thin sectioning, all from from Gardner’s Bank. Description. Scales with a narrow furrowed overlapped area that is incompletely preserved on most of specimens available. Low ridges on the main scale area are wellspaced with the ends nearest the anterior overlapped area slightly curved. Each ridge
- Page 1 and 2: LATVIJAS UNIVERSITĀTES RAKSTI 679.
- Page 3 and 4: LATVIJAS UNIVERSITĀTES RAKSTI 679.
- Page 5 and 6: Contents Ervīns Lukševičs and Ģ
- Page 7 and 8: ACTA UNIVERSITATIS LATVIENSIS, 2004
- Page 9 and 10: Ervīns Lukševičs, Ģirts Stinkul
- Page 11 and 12: Ervīns Lukševičs, Ģirts Stinkul
- Page 13 and 14: Ervīns Lukševičs, Ģirts Stinkul
- Page 15 and 16: Olga Afanassieva. Microrelief on th
- Page 17 and 18: Olga Afanassieva. Microrelief on th
- Page 19 and 20: Olga Afanassieva. Microrelief on th
- Page 21 and 22: Olga Afanassieva. Microrelief on th
- Page 23 and 24: D.K. Elliott, E. Mark-Kurik, E.B. D
- Page 25 and 26: D.K. Elliott, E. Mark-Kurik, E.B. D
- Page 27 and 28: D.K. Elliott, E. Mark-Kurik, E.B. D
- Page 29 and 30: D.K. Elliott, E. Mark-Kurik, E.B. D
- Page 31 and 32: D.K. Elliott, E. Mark-Kurik, E.B. D
- Page 33 and 34: D.K. Elliott, E. Mark-Kurik, E.B. D
- Page 35 and 36: D.K. Elliott, E. Mark-Kurik, E.B. D
- Page 37 and 38: D.K. Elliott, E. Mark-Kurik, E.B. D
- Page 39 and 40: D.K. Elliott, E. Mark-Kurik, E.B. D
- Page 41 and 42: D.K. Elliott, E. Mark-Kurik, E.B. D
- Page 43 and 44: D.K. Elliott, E. Mark-Kurik, E.B. D
- Page 45 and 46: D.K. Elliott, E. Mark-Kurik, E.B. D
- Page 47 and 48: C.G.Miller, T. Marss, H. Blom. New
- Page 49 and 50: C.G.Miller, T. Marss, H. Blom. New
- Page 51: C.G.Miller, T. Marss, H. Blom. New
- Page 55 and 56: 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 61 and 62: H.-P. Schultze, T. Marss. Revisitin
- Page 63 and 64: H.-P. Schultze, T. Marss. Revisitin
- Page 65 and 66: H.-P. Schultze, T. Marss. Revisitin
- Page 67 and 68: H.-P. Schultze, T. Marss. Revisitin
- Page 69 and 70: H.-P. Schultze, T. Marss. Revisitin
- Page 71 and 72: H.-P. Schultze, T. Marss. Revisitin
- Page 73 and 74: H.-P. Schultze, T. Marss. Revisitin
- Page 75 and 76: H.-P. Schultze, T. Marss. Revisitin
- Page 77 and 78: H.-P. Schultze, T. Marss. Revisitin
- Page 79 and 80: ACTA UNIVERSITATIS LATVIENSIS, 2004
- Page 81 and 82: O.A. Lebedev. A new tetrapod from R
- Page 83 and 84: O.A. Lebedev. A new tetrapod from R
- Page 85 and 86: O.A. Lebedev. A new tetrapod from R
- Page 87 and 88: O.A. Lebedev. A new tetrapod from R
- Page 89 and 90: O.A. Lebedev. A new tetrapod from R
- Page 91 and 92: O.A. Lebedev. A new tetrapod from R
- Page 93 and 94: O.A. Lebedev. A new tetrapod from R
- Page 95 and 96: O.A. Lebedev. A new tetrapod from R
- Page 97 and 98: O.A. Lebedev. A new tetrapod from R
- Page 99 and 100: ACTA UNIVERSITATIS LATVIENSIS, 2004
- Page 101 and 102: E. Lukševičs, I. Zupiņš. Sedime
52 ADVANCES IN PALAEOICHTHYOLOGY<br />
Fig. 3. SEM pictures of fragments of scales in external view <strong>un</strong>less stated. All scale bars are 0.2<br />
mm. A-F, Trimpleylepis concatenata gen. et sp. nov., fragments of scales from Ohesaare Borehole,<br />
Saaremaa, Estonia, depth 94.32-94.40 m, Ludfordian, Upper Silurian. A, GIT 384-1; B, GIT<br />
384-2; C, GIT 384-3, D; GIT 384-4; E, GIT 384-5; F, GIT 384-6. G-H. Silmalepis cf. erinacea<br />
Blom, Märss <strong>and</strong> Miller, 2002, scale fragment from Man Brook, upper part of Prídolí Series,<br />
Upper Silurian, NHM P 66018(1): G, scale in external view; H, close up of sculpture. I- L,<br />
Family Rhyncholepididae Kiær, 1924 gen. et sp. indet., fragments of scales from Gardner’s<br />
Bank, c. 7m below Psammosteus Limestone, U. Downton Group, Prídolí, Silurian. I, GIT 384-<br />
7. J; GIT 384-8; K, scale now sectioned <strong>and</strong> illustrated in Fig. 2D; L. GIT 384-9, visceral view.
Change language