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Image

from article Olenellina

A fossilized Olenellus trilobite belonging to the suborder Olenellina. This trilobite was discovered among the Early Cambrian strata of the Eager Formation in British Columbia, Canada. (Credit: Houston Museum of Natural Science)

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from article Cetacea

Dusky dolphins (Lagenorhynchus obscurus) in the coastal waters of New Zealand. (Credit: Mridula Srinivasan/Assessment and Monitoring Division, Office of Science and Technology, National Marine Fisheries Service, National Oceanic and Atmospheric…

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from article Cetacea

Killer whale (Orcinus orca) in Monterey Bay, California. (Credit: Tory Kallman/Getty Images)

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from article Cetacea

A humpback whale opens its mouth wide to collect prey, and then filters food from the water using its baleen. (Credit: John Tunney/Shutterstock)

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from article Cetacea

Sperm whales (Physeter macrocephalus). (Credit: Gabriel Barathieu)

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from article Cetacea

Skeletal reconstruction of Ambulocetus natans. (Credit: J. G. M. Thewissen)

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from article Cetacea

Cetacean fossils. (a) Left upper premolar. (b) Skull of Dorudon atrox (alternatively Prozeuglodon stromeri) from the early Oligocene of Egypt. (c) Skull of Delphinodon dividum from the middle Miocene of Maryland. (Copyright © McGraw-Hill Education)

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from article Conodont

Conodont elements: (a, b) coniform elements, (c, d) ramiform elements, (e, f) pectiniform blade elements, (g, h) pectiniform platform elements, (i) bedding-plane assemblage.

Image

from article Conodont

The first specimen of the conodont animal discovered in Lower Carboniferous rocks in Edinburgh. (a) Photograph of specimen. (b) Outline of the specimen for comparison. (Credit: D. E. G. Briggs and R. J. Aldridge)

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from article Conodont

Head region of the conodont animal, showing the conodont elements on the side of the slab opposing that illustrated in Fig. 2. (Credit: D. E. G. Briggs and R. J. Aldridge)