Image
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,…
Image
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)…
Image
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 Neomeniomorpha
Gymnomenia virgulata Scheltema from a depth of 620 m (2000 ft) off Walvis Bay, Namibia. (a) Entire specimen, anterior to right, long cilia extending from the pedal pit. (b, c) Posterior and anterior ends, respectively. (d) Ventral view of a,…
Image
from article Monoplacophora
Living and fossil Monoplacophora. (a) Neopilina galatheae. (b) Tryblidium reticulatum. (After R. C. Moore, ed., Treatise on Invertebrate Paleontology, pt. I, 1957)
Image
from article Monoplacophora
Side views of various helcionellacean and bellerophont univalved mollusks. (a) Cyrtonellopsis; (b) Hypseloconus; (c) Cyclocyrtonella; (d) Stenotheca; (e) Bellerophon; (f) Tropidodiscus. (After B. Runnegar, Class Monoplacophora, in R. S. Boardman, A.…
Image
from article Gorgonacea
Gorgonian colonies in life. (a) Plumigorgia cf. hydroides, Palawan, Philippines. (b) Eunicella gracilis, São Tomé, Gulf of Guinea. (c) Junceella fragilis, Luzon, Philippines. (d) Leptogorgia alba, Cocos Island, Costa Rica. (e) Astrogorgia sp.,…
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from article Gorgonacea
Some common gorgonaceans. (a) Thouarella hicksoni (inset, detail of polyps). (b) Ideogorgia capensis. (c) Eunicella papillosa. (d) Leptogorgia lutkeni. (e) Junceella sp. (f) Anthothela parviflora. (g) Rumphella sp. (h) Homophyton verrucosum. (i)…
Image
from article Gorgonacea
Gorgonian colonies (dry preserved specimens). (a) Briareum sp. (b) Ideogorgia capensis. (c) Chrysogorgia pinnata. (d) Fanellia compressa. (e) Viminella sp. (f) Paragorgia sp. (g) Subergorgia suberosa. (h) Isis hippuris. (i) Solenocaulon sp.
