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7 results for “fossil record quality”
FIG. 5 in Temporal paralogy, cladograms, and the quality of the fossil record
FIG. 5. — Pectinate cladogram illustrating Pongidae relationships as currently understood; A, all nodes are temporally informative (orthologous). The age of diversification of Pan is more recent than the age of origin of (Homo, Pan); B, the addition of a fossil taxon (Homo neanderthalensis) defines a paralogous node and two new arrows of time (black arrows). Consequently the fit of ages of diversification of both Homo and Pan to stratigraphy is meaningless.
FIG. 4 in Temporal paralogy, cladograms, and the quality of the fossil record
FIG. 4. — Temporal paralogy and the origin of tetrapods. The possibility of osteolepiforms being ancestors of tetrapods has been reinterpreted based on a parsimony analysis (Ahlberg & Johanson 1998). Among osteolepiforms, the Tristichopteridae appear as the closest relative to the Tetrapoda. The common ancestor of both groups is represented by a paralogous node, and according to temporal hierarchy the relative inclusiveness of each of the sister-groups cannot be decided. As a consequence, the Tetrapoda can be supposed to have occurred before the first appearance of osteolepiforms (Eifelian). There are no arguments to see osteolepiforms as possible ancestors of tetrapods, if this question has any meaning when argued from a parsimony analysis.
FIG. 3 in Temporal paralogy, cladograms, and the quality of the fossil record
FIG. 3. — Temporal information and cladograms; A, maximally informative cladogram of taxa (A-F) and their ages (6-1). All nodes are orthologous, and the ages of the fossil specimens can be either consistent or not with the temporal hierarchy; B, the effect of a better knowledge of the fossil record by addition of the age of a supplementary taxon (N, 4) is the decrease in temporal resolution. The number of informative (orthologous) nodes decreases (white circles) as temporally ambiguous nodes appear (shown as grey circles) node leading to two terminals or a terminal and a paralogous node, the black circle corresponds a new paralogous node, indicating a temporal paralogy. The ages of sister-taxa (C, N) and (D, E, F) are temporal paralogs. Each arrow represents a semi-independent temporal hierarchy.
Data from: Ten more years of discovery: revisiting the quality of the sauropodomorph dinosaur fossil record
<p>Spatiotemporal changes in fossil specimen completeness can bias our understanding of a group's evolutionary history. The quality of the sauropodomorph fossil record was assessed a decade ago, but the number of valid species has since increased by 60%, and 17% of the taxa from that study have since undergone taxonomic revision. Here, we assess how 10 years of additional research has changed our outlook on the group's fossil record. We quantified the completeness of all 307 sauropodomorph species currently considered valid, using the skeletal completeness metric, which calculates the proportion of a complete skeleton preserved for each taxon. Taxonomic and stratigraphic age revisions, rather than new species, are the drivers of the most significant differences between the current results and those of the previous assessment. No statistical differences are found when we use our new dataset to generate temporal completeness curves based on only the taxa known in 2009 or 1999. We now observe a severe drop in mean completeness values across the Jurassic/Cretaceous boundary that never recover to pre-Cretaceous levels. Explaining this pattern is difficult, as we find no convincing evidence it is related to environmental preferences or body size changes. Instead, it might result from: (1) reduction of terrestrial fossil preservation space due to sea level rise; (2) ecological specificities and relatively high diagnosability of Cretaceous species; and/or (3) increased sampling of newly explored sites with many previously unknown taxa. Revisiting patterns in this manner allows us to test the longevity of conclusions made in previous quantitative studies.</p>
Data from: Ten more years of discovery: revisiting the quality of the sauropodomorph dinosaur fossil record
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Data from: The first half of tetrapod evolution, sampling proxies, and fossil record quality
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Data from: Deep time diversity of metatherian mammals: implications for evolutionary history and fossil-record quality
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