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 ...
108 ADVANCES IN PALAEOICHTHYOLOGY Table 1. List of identified taxa from the Pavāri site Placodermi Euantiarcha Bothriolepididae Bothriolepis ciecere Lyarskaja Acanthodii “Devononchus” tenuispinus Gross “Devononchus” ketleriensis Gross Acanthodii gen.et sp.indet. Osteichthyes Palaeonisci Palaeonisci gen. et sp. indet. Sarcopterygii Porolepiformes Holoptychius cf. nobilissimus Agassiz Ventalepis ketleriensis Schultze Osteolepiformes Glyptopomus ? bystrowi (Gross) Cryptolepis grossi Vorobyeva Dipnoi Orlovichthys cf. limnatis Krupina Tetrapoda Ventastega curonica Ahlberg, Lukševičs et Lebedev vertebrate occurrence. In 1988 the number of remains for each taxon was documented already at the outcrop. These data are included in our analysis as well. Both the number of specimens for each taxa and minimum number of individuals (MNI) have been taken into account (Table 2, Fig. 6). The minimum number of individuals has been evaluated based on the maximum number of identical skeletal parts, e.g. jaws or individual plates of armour from the same side of the trunk, etc. Only macroremains, including acanthodian spines, were counted. Acanthodian scales are quite common; still their number has not been considered in further analysis as they underwent different regularities of sedimentation due to the small size of the scales equal to that of sand grains. The material from 1970 and 1973 expeditions has been used only for comparison, as the data on percentage were available only by counting the specimens in the collection No. LDM G 81. In 1988 all the specimens were counted, including those which have not been included in the museum collection after preparation. Also it is worth noting that during the 1995 and 2001 year expeditions special attention was paid to tetrapod remains. Therefore tetrapod or sarcopterygian fish remains could be slightly overestimated. As the preparation of the material collected in 2001 still goes on, the data from this expedition is not complete and therefore excluded from this analysis. Placoderm Bothriolepis ciecere dominates the vertebrate assemblage of each individual expedition. All together, placoderms varies between different collection years in representation from 47% to 97% of the total number of remains. When estimating
E. Lukševičs, I. Zupiņš. Sedimentology, fauna, and taphonomy of Pav āri 109 Table 2. Number of specimens and minimum number of individuals of vertebrates from the Pavāri site. 1970, 1973, 1988, 1991, 1995, excavation of particular year. Total, number of specimens from all excavations. Perc., percentage of specimens. MNI, minimum number of individuals from all excavations. Unidentified specimens, paleoniscoid and acanthodian scales not included. Fig. 6. A, percent representation of vertebrate specimens identified to at least generic level from Pavāri site (n = 909). B, percent representation of vertebrate taxa based on MNI from Pavāri site.
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108 ADVANCES IN PALAEOICHTHYOLOGY<br />
Table 1. List of identified taxa from the Pavāri site<br />
Placodermi<br />
Euantiarcha<br />
Bothriolepididae<br />
Bothriolepis ciecere Lyarskaja<br />
Acanthodii<br />
“Devononchus” tenuispinus Gross<br />
“Devononchus” ketleriensis Gross<br />
Acanthodii gen.et sp.indet.<br />
Osteichthyes<br />
Palaeonisci<br />
Palaeonisci gen. et sp. indet.<br />
Sarcopterygii<br />
Porolepiformes<br />
Holoptychius cf. nobilissimus Agassiz<br />
Ventalepis ketleriensis Schultze<br />
Osteolepiformes<br />
Glyptopomus ? bystrowi (Gross)<br />
Cryptolepis grossi Vorobyeva<br />
Dipnoi<br />
Orlovichthys cf. limnatis Krupina<br />
Tetrapoda<br />
Ventastega curonica Ahlberg, Lukševičs et Lebedev<br />
vertebrate occurrence. In 1988 the number of remains for each taxon was documented<br />
already at the outcrop. These data are included in our analysis as well. Both the number<br />
of specimens for each taxa <strong>and</strong> minimum number of individuals (MNI) have been taken<br />
into acco<strong>un</strong>t (Table 2, Fig. 6). The minimum number of individuals has been evaluated<br />
based on the maximum number of identical skeletal parts, e.g. jaws or individual plates<br />
of armour from the same side of the tr<strong>un</strong>k, etc. Only macroremains, including acanthodian<br />
spines, were co<strong>un</strong>ted. Acanthodian scales are quite common; still their number has not<br />
been considered in further analysis as they <strong>un</strong>derwent different regularities of<br />
sedimentation due to the small size of the scales equal to that of s<strong>and</strong> grains. The<br />
material from 1970 <strong>and</strong> 1973 expeditions has been used only for comparison, as the<br />
data on percentage were available only by co<strong>un</strong>ting the specimens in the collection No.<br />
LDM G 81. In 1988 all the specimens were co<strong>un</strong>ted, including those which have not<br />
been included in the museum collection after preparation. Also it is worth noting that<br />
during the 1995 <strong>and</strong> 2001 year expeditions special attention was paid to tetrapod remains.<br />
Therefore tetrapod or sarcopterygian fish remains could be slightly overestimated. As<br />
the preparation of the material collected in 2001 still goes on, the data from this<br />
expedition is not complete <strong>and</strong> therefore excluded from this analysis.<br />
Placoderm Bothriolepis ciecere dominates the vertebrate assemblage of each<br />
individual expedition. All together, placoderms varies between different collection years<br />
in representation from 47% to 97% of the total number of remains. When estimating
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