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from article Paleogenomics
Diagram of the massively parallel picoliter-scale sequencing method, which accommodates 1.6 million reads, each approximately 100 base pairs in length.
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from article Paleogenomics
Histological micrograph of a Rhamphorhynchus (pterosaur from the Jurassic Period) radius in cross section. Scale bar: 100 micrometers.
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from article Vertebrate origins
Interrelationships among deuterostome taxa. (a) Among deuterostome phyla in relation to protostomes. (b) Among chordate subphyla. (c) Among vertebrate fish taxa. (d) Among urochordate classes.
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from article Vertebrate origins
Comparison of the three vertebrate brain regions and gene expression patterns with amphioxus and ascidian. Each gene expression pattern supports a hypothesis of homology for the fore/midbrain, isthmus/cerebellum, and hindbrain regions with the…
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from article Vertebrate origins
Gene number estimates. Shaded bars indicate results from completed genome projects; open bars are estimated values. Note that the value for “human” is representative for other vertebrates examined, including mouse and pufferfish. (Modified from M.…
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from article Post-Paleozoic ecological complexity
Two contrasting relative abundance distributions from Ordovician and Pleistocene assemblages of skeletonized bottom-dwelling marine animals, representing early Paleozoic and late post-Paleozoic time intervals, respectively. Abundances are shown on a…
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from article Post-Paleozoic ecological complexity
(a) Simple and (b) complex model relative abundance distributions (RADs) are shown as the proportions of individuals belonging to each species in a community, with species ordered from most to least abundant. Distributions were calculated with the…
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from article Post-Paleozoic ecological complexity
(a) Percentages of complex RADs for fossil assemblages in the Paleozoic and post-Paleozoic are shown. All statistically significant RADs are summarized within successive geologic time periods as mean values (circles) and error bars indicating one…
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from article Dino-Birds
Diagram of theropod dinosaur and bird evolution showing that primitive feathers, first known from Sinosauropteryx, go back a long way in theropod history. True feathers appeared later within the major group Maniraptora.
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from article Dino-Birds
Nicknamed “Fuzzy raptor,” this spectacularly preserved juvenile dromaeosaur from Liaoning shows the typical long grasping hands and swiveling wrist bones together with extensive preservation of feathers around the body and limbs. (Reprinted with…
