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92 ADVANCES IN PALAEOICHTHYOLOGY Table I. Taphonomical, environmental and assemblage structure data on the localities and assemblages of the Devonian tetrapods Table I includes information on 8 known tetrapod localities and on two others in which tetrapods are unknown, used for comparative purposes (Rybnitsa in Oryol Region, Russia and Ala-Archa, Kirghizstan). The Rybnitsa locality is known to render a vertebrate assemblage very close to the Latvian Ketleri and Pavari localities (Lebedev 1995; Lebedev and Lukševics 1996). The Ala-Archa locality yielded the remains of an antiarch fish Remigolepis, which seems to play an important role in the structure of the Devonian tetrapod biota.
O.A. Lebedev. A new tetrapod from Russia 93 Continuation of the Table One of the problems of Palaeozoic biota reconstruction is determining whether fossil remains found in the oryctocoenosis are autochthonous or allochthonous. This is usually estimated by use of transportation traces on the skeletal elements, more precisely the degree of post mortem wear. If this wear is considerable, it almost certainly indicates long transportation and possible introduction of alien animal remains to the taphocoenosis. The most accurate approach towards this problem is to regard as autochthonous only articulated or at least semi-articulated skeletal parts. In Table I this regards only the East Greenland and Andreyevka localities. However disarticulated, the Red Hill remains were also regarded as autochthonous by Daeschler (2000). All the rest are formally regarded as allochtonous despite the possibility of long pebbling within the same basin and biotope which was the original dwelling place. This indeterminate
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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
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D.K. Elliott, E. Mark-Kurik, E.B. D
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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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