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 ...
162 ADVANCES IN PALAEOICHTHYOLOGY Fig. 2. Talimaalepis rimae gen. et sp. nov. scale morphological varieties. Kyzyl-Tchiraa outcrop, Central Tuva; Tchergak series, Kyzyl-Tchiraa Regional Stage, Upper Llandovery, Lower Silurian. A, LGI M-1/240, oral scale; B, LGI M-1/241, oral scale; C, LGI M-1/242, oral scale; D, LGI M- 1/248, cephalo-pectoral scale; E, LGI M-1/257, cephalo-pectoral scale; F, LGI M-1/250, cephalopectoral scale; G, LGI M-1/246; H, LGI M-1/222, pore sensory canal – system scale; I, LGI M-
Ž. Žigaite. New telodont from Tuva and Mongolia 163 Fig. 3. Talimaalepis rimae gen. et sp. nov., cephalo-pectoral scale, horizontal longitudinal thin section (B is part of A). Lake Basin outcrop No 21, north west Mongolia; Chargat Formation, Salhit Regional Stage, Upper Llandovery – Wenlock, Lower Silurian. Thin section No 80, Institute of Geology and Geography, Lithuania. Abbreviations: a – anastomoses; dc – thin dentine canals; spc – single pulp canal; thdc – thick dentine canals. Scale bars: 100 µm. canal makes a substantial difference, as in Helenolepis scales, there are three or more pulp canals, subject to a number of crown segments (Karatajūte-Talimaa 1978, p. 236, Fig. 14). Sparse anastomoses of usually straight dentine canals make the histology of the scales closer to that of genus Loganellia. Scales with sensory pore canal system elements are described in Family Phlebolepididae, Loganelliidae, Shieliidae, Boothialepididae, Turiniidae, and in Furcacaudifrmes (Gross 1968, Märss 1979, Miller and Märss 1999, Märss 1999, Märss and Miller 2004, Turner 1991, Wilson and Caldwell 1998). On the basis of a different central part of the crown, and shorter lateral areas, as well as the presence of a single pulp canal, the taxon can be ascribed neither to genus Loganellia, nor to Helenolepis. Distribution. Apart of the type locality, remains of Talimaalepis rimae gen. et sp. nov. are found in several localities of the Central Tuva: outcrop Kyzyl-Tchiraa (Kyzyl-Tchiraa Formation, Kyzyl-Tchiraa Regional Stage, upper Llandovery), outcrop Elegest (Dashtygoi Formation, Dashtygoi Regional Stage, upper Wenlock), Kadvoj sequence (Tchergak Formation, Angatchi and Dashtygoi regional stages, upper Llandovery and upper Wenlock). 1/247, cephalo-pectoral scale; J, LGI M-1/243, cephalo-pectoral scale; K, LGI M-1/245, cephalopectoral scale; L, LGI M-1/229, cephalo-pectoral scale; M, LGI M-1/219, precaudal scale; N, LGI M-1/249, pinnal scale; O, LGI M-1/221, pinnal scale. Scale bars: A, B, 100 µm; C, D, F, G, J, L, 200 µm; E, H, I, N, 300 µm; O, 400 µm; K, M, 500 µm.
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162 ADVANCES IN PALAEOICHTHYOLOGY<br />
Fig. 2. Talimaalepis rimae gen. et sp. nov. scale morphological varieties. Kyzyl-Tchiraa outcrop,<br />
Central Tuva; Tchergak series, Kyzyl-Tchiraa Regional Stage, Upper Ll<strong>and</strong>overy, Lower Silurian.<br />
A, LGI M-1/240, oral scale; B, LGI M-1/241, oral scale; C, LGI M-1/242, oral scale; D, LGI M-<br />
1/248, cephalo-pectoral scale; E, LGI M-1/257, cephalo-pectoral scale; F, LGI M-1/250, cephalopectoral<br />
scale; G, LGI M-1/246; H, LGI M-1/222, pore sensory canal – system scale; I, LGI M-
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