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from article Trilobita
Two iron-stained trilobites (Paradoxides) on a bedding plane slab from Morocco, North Africa, of Cambrian age. (Credit: Alan Morgan)
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Image
from article Trilobita
Trilobite diversity and preservation. (a) Olenellid, Lower Cambrian (British Columbia). External mold of exoskeleton in shale. (b) Ogygopsis, Middle Cambrian (British Columbia). Molt assemblage, with cranidium and pygidium aligned, but librigenae,…
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from article Trilobita
Morphological features of trilobites. (a) Calymene, Silurian (New York). Dorsal view of mineralized exoskeleton. (b) Phacops, Devonian (Ohio). Ventral (bottom) view of cephalon and anterior segments of the thorax, with hypostome attached. (c)…
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from article Trilobita
Triarthrus eatoni, Upper Ordovician (New York). Reconstruction with dorsal exoskeleton removed on right side to show appendages. Antennae are incomplete. Exites (gill branches) of the first nine postantennal appendages are removed to show the…
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from article Siderite
Siderite specimen. (RF Company/Alamy)
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from article Fate maps (embryology)
Principle of fate mapping. (a) Label placed in a certain position on the egg ends up in a reproducible position on the later animal. (b) Possible fate map for this type of egg. (Reprinted with permission from J. M. W. Slack, Essential Developmental…
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from article Fate maps (embryology)
Fate maps of urodele blastula from (a) lateral and (b) dorsal aspects, deduced from vital staining. (After J. M. W. Slack, From Egg to Embryo: Determinative Events in Early Development, Cambridge University Press, 1983)
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from article Fate maps (embryology)
Fate map of the Arabidopsis embryo. (a) Heart stage embryo. (b) Mature embryo. (c) Seedling. The embryo is delineated into sectors from an early heart stage to give rise to specific regions or tissue types. The apical region (large shaded areas in…
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from article Fate maps (embryology)
Image of an Arabidopsis root tip (confocal micrograph). The root morphology is revealed by counterstaining with propidium iodide. The nuclei marked by fluorescent marker (circles at left) represent cells derived from a single initial/progenitor cell…
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from article Titanium oxides
Representations of the crystal structures of the three polymorphs of titanium dioxide, TiO2: rutile, brookite, and anatase. The octahedral units represent titanium atoms surrounded by six oxygen atoms. [From J. E. S. Haggerty et al., Sci. Rep.,…
