Zemes un vides zinātnes Earth and Environment Sciences - Latvijas ...

More documents

Recommendations

Info

78 ADVANCES IN PALAEOICHTHYOLOGY
ACTA UNIVERSITATIS LATVIENSIS, 2004, Vol. 679, pp. 79-98 A new tetrapod Jakubsonia livnensis from the Early Famennian (Devonian) of Russia and palaeoecological remarks on the Late Devonian tetrapod habitats OLEG A. LEBEDEV Oleg A. Lebedev, Palaeontological Institute of the Russian Academy of Sciences, 123 Profsoyuznaya St., Moscow 117997, Russia; olebed@paleo.ru Skeletal remains of the earliest tetrapod Jakubsonia livnensis gen. et sp. nov. are described from the Lower Famennian, Upper Devonian of the Gornostayevka quarry (SW of the Livny Town, Oryol Region, Russia). A part of the skull roof, incomplete angular, the right cleithrum with scapulocoracoid and partial femur are described. The new genus demonstrates characters in the structure of the interorbital region and the cleithrum suggesting similarity to the Ventastega Ahlberg, Lukševics and Lebedev, 1994. An analysis of early tetrapod sites indicates that these animals dwelled within a wide range of aquatic environments. The antiarch genus Remigolepis played an important role in Famennian tetrapod communities. The presence of more than one tetrapod in the communities indicates many more diverse tetrapod trophic adaptations than previously considered. Key words: tetrapods, Russia, Oryol region, Devonian, Famennian, palaeoecology, Jakubsonia. Introduction Studies of Late Devonian tetrapods became especially intensive during the last decade of the 20th century. Apart from Ichthyostega Säve-Söderbergh, 1932 and Acanthostega Jarvik, 1952, new taxa from most continents of the world, of both Laurussian and Gondwanan origin, have recently been described. Most of these tetrapods (Metaxygnathus Campbell and Bell, 1977, from Australia, Tulerpeton Lebedev, 1984 from Russia, Hynerpeton Daeschler, Shubin, Thomson and Amaral, 1994 and Densignathus Daeschler, 2000 from Pennsylvania (U.S.A.), Ventastega Ahlberg, Lukševics and Lebedev, 1994 from Latvia, Sinostega Zhu, Ahlberg, Zhao and Jia, 2002 from China and an ichthyostegid tetrapod from Belgium) (Campbell and Bell 1977; Lebedev 1984; Lebedev and Clack 1993; Daeschler et al. 1994; Lebedev and Coates 1996; Ahlberg, Lukševics and Lebedev 1994; Daeschler 2000; Zhu et al. 2002; Lukševics, Ahlberg and Clack 2003; Clement et al. 2004) originate from the upper and middle Famennian deposits. Only Elginerpeton pancheni Ahlberg, 1995 is known from the upper Frasnian of Scotland (Ahlberg 1995, 1998). For that reason, each new find of tetrapod material in deposits older than middle Famennian make a contribution of special interest to our knowledge in this field of vertebrate palaeontology. The first finds of vertebrates from the rich fossil vertebrate locality Gornostayevka quarry (sometimes previously called the Livny quarry) situated to the SW of the Livny
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:
Page 13 and 14:
Page 15 and 16:
Olga Afanassieva. Microrelief on th
Page 17 and 18:
Page 19 and 20:
Page 21 and 22:
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 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 77: H.-P. Schultze, T. Marss. Revisitin
Page 81 and 82: 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
Page 121 and 122: J. Valiukevičius. Silurian acantho
Page 129 and 130:
J. Valiukevičius. Silurian acantho
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
Page 139 and 140:
Page 141 and 142:
Page 143 and 144:
Page 145 and 146:
Page 147 and 148:
Page 149 and 150:
V. Pernegre, V. Dupret. Biostratigr
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Ž. Žigaite. New telodont from Tuv
Page 161 and 162:
Page 163 and 164:
Page 165 and 166:
show all

Zemes un vides zinātnes Earth and Environment Sciences - Latvijas ...

Create successful ePaper yourself

Delete template?

Save as template?