Image
from article Astrapotheria
Skeleton of Astrapotherium magnum. The genus Astrapotherium is known from the late Oligocene to the late Miocene.
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from article Lycopsida
Lycopodium clavatum, a representative homosporous lycopsid. (a) Sporophyte showing typical rhizomatous growth and paired cones. (b) Microphyllous leaf. (c) Sporophyll bearing a sporangium on the upper surface. (From K. R. Sporne, The Morphology of…
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from article Marsupialia
Skull and jaws of marsupials. (a) Didelphidae, Didelphis (the carnivorous opossum of North America), Recent, with polyprotodont incisors (I 5/4). (b) Phalangeridae, Trichosurus (the herbivorous opossum of Australia), Recent, with diprotodont…
Image
from article Marsupialia
Views of the soles of the left hindfoot of marsupials. (a) Didelphidae, Didelphis, representing the five-toed, polydactylous condition. (b) Phalangeridae, Trichosurus, representing the five-toed, syndactylous condition (digits II and III are bound…
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from article Pholidota
Pangolin (genus Manis, order Pholidota). (Photo courtesy of the Wildlife Alliance)
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from article Hexactinellida
The dried siliceous skeleton of a glass sponge, Euplectella. (Credit: Randolph Femmer/United States Geological Survey)
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from article Hexactinellida
The class Hexactinellida includes living and fossil forms. Living hexactinellids: (a) Hyalonema (Cyliconema) thomsoni (order Amphidiscosida) and (b) Regadrella phoenix (order Lyssacinosida). Fossil hexactinellid: (c) Hydnoceras tuberosum (order…
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from article Hexactinellida
A fossil hexactinellid sponge, Hydnoceras bathense (order Reticulosa). (Credit: James St. John)
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from article Lagomorpha
Pika (Ochotona princeps). (Copyright © California Academy of Sciences)
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from article Jawless vertebrates
Interrelationships of jawless and jawed vertebrates, showing the distribution of some major evolutionary steps.
