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from article Galliformes
White-tailed ptarmigan (Lagopus leucurus), Glacier National Park, Montana. (Photo by Gerald and Buff Corsi, copyright © California Academy of Sciences)
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from article Echinoida
Tripneustes ventricosus (Lamarck), tropical eastern and western Atlantic, found at depths of 0–55 m (0–180 ft). (From G. Hendler et al., Sea Stars, Sea Urchins and Allies: Echinoderms of Florida and the Caribbean, Smithsonian Press, Washington, DC,…
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from article Echinoida
A pyramid from Aristotle's lantern, showing epiphyses joined and tooth with keel. (After H. L. Hawkins, The lantern and girdle of some Recent and fossil Echinoidea, Philos. Trans. R. Soc. Lond. Ser. B, 223:617–649, 1934)
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from article Echinoida
An ambulacral plate from the test, with the lowest element being the largest. (After T. Mortensen, A monograph of the Echinoidea: Camarodonta, C. A. Reitzel, Copenhagen, 1943)
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from article Paramecium
Photomicrograph of Paramecium caudatum. (Credit: Nancy Nehring/Getty Images)
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from article Heterodonta
Common heterodont bivalves. (Credit: Ronald V. Dimock, Jr.)
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from article Heterodonta
Common heterodont bivalves. (Credit: Ronald V. Dimock, Jr.)
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from article Aye-aye
Aye-aye (Daubentonia madagascariensis). (Photograph by Urs Thalmann, Anthropological Institute, University of Zürich)
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from article Tick virus diseases
A deer or black-legged tick (Ixodes scapularis). (Credit: U.S. Centers for Disease Control and Prevention)
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from article Tick virus diseases
Diagram depicting the life cycle of Ixodes scapularis. This deer tick can transmit viruses and other pathogens that cause a number of important diseases, including Lyme disease, anaplasmosis, and babesiosis. The risk of human infection is greatest…
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from article Tick virus diseases
World map depicting the locations of human tick-borne disease cases. Heartland, Bourbon, and Colorado tick fever virus cases are unique to North America. Powassan encephalitis cases are reported in North America and Russia. Tick-borne encephalitis…
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from article Tick virus diseases
Cases of Powassan encephalitis reported in the United States from 2006 to 2015. Most of the reported cases are in Minnesota, New York, and Wisconsin. (Credit: ArboNET, Arboviral Diseases Branch, U.S. Centers for Disease Control and Prevention)
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from article Euryalida
Aboral body of a basket star, Euryale aspera (family Euryalidae, order Euryalida), clinging to a red soft coral colony and spreading its branching arms.
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from article Euryalida
A snake star, Astrochele pacifica (family Gorgonocephalidae, order Euryalida): (a) aboral body; (b) aboral arms; and (c) a scanning electron microscope (SEM) image of a separated microscopic hook. (Credit for photo a: Shimoda Marine Research Center,…
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from article Pinnipeds
Walrus (Odobenus rosmarus). (Credit: Donna Dewhurst Collection/U.S. Fish and Wildlife Service)
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from article Pinnipeds
Steller sea lion and pup (Eumetopias jubatus). (Credit: Alaska Image Library/U.S. Fish and Wildlife Service)
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from article Pinnipeds
Evolutionary relationships and stratigraphic ranges of major groups of pinnipeds. Shaded bars correspond to known ranges, and white bars correspond to inferred ranges. Ma = million years ago. (Copyright © McGraw-Hill Education)
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from article Panda
Giant panda (Ailuropoda melanoleuca). (Credit: John White)
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from article Panda
Red panda (Ailurus fulgens). (Credit: John White)
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from article Eocrinoidea
Reconstructions of Cambrian and Ordovician eocrinoids. (a) Gogia spiralis, from the Middle Cambrian of Utah, showing the primitive holdfast; sutural pores between the numerous thecal plates; and long, spiraled brachioles attached to the summit…
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from article Kinetoplastida
Representative genera of families of order Kinetoplastida. (a) Oikomonas (family Oikomonadidae), one anterior flagellum. (b) Amphimonas (family Amphimonadidae), two equally long anterior flagella. (c) Monas (family Monadidae), two unequally long…
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from article Giraffe
Giraffe (genus Giraffa). (Credit: Arthur J. Emmrich; copyright © California Academy of Sciences)
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from article Sarcosporida
Cross section of Miescher's tube filled with Sarcocystis spores (probably S. lindemanni) from a monkey.
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from article Conulariida
Conulariid morphology. (a) Paraconularia byblis, a well-preserved specimen in siderite (iron carbonate) from the Carboniferous (Mississippian) of Ohio showing two adjacent sides meeting at a deep corner groove (arrow). Ridges along each side meet at…
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from article Conulariida
Conulariid paleoecology and taphonomy. (a) Cluster of Conularia congregata compacted in shale from the Devonian of New York. The specimens show apical walls (lower arrow), indicating detachment from, or nonpreservation of, their attachment stalks.…
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from article Aspidogastrea
Examples of adult Aspidogastrea: Stichocotyle, Rugogaster, and Aspidogaster. Note Stichocotyle with a single longitudinal row of suckers, Rugogaster with a single row of rugae, and Aspidogaster with four rows of alveoli.
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from article Aspidogastrea
Larva of Multicotyle purvisi (ventral view). Note the pharynx, single cecum, posterior sucker, two pigmented eyes, ten ciliary tufts, the layer of microfila, and the two excretory bladder cells at the anterior margin of the sucker.
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from article Aspidogastrea
Life cycle of Lobatostoma manteri. Adult worms produce eggs in the small intestine of the snubnose dart, the carangid fish Trachinotus blochi; eggs shed by fish are ingested by snails of various species, in which the larva (with a posterior sucker,…
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from article Cyprinodontiformes
Female marsh killifish (Fundulus confluentus). (Illustration copyright © by Joseph R. Tomelleri)
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from article Cicada
Brood IX periodical cicada in Athens, West Virginia. (Photo by Louie H. Yang)
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from article Cicada
Periodical cicada life cycle. Counterclockwise from lower left: Nymphal cicada feeding on plant roots belowground; ants and other detrivores feeding on dead cicada litterfall; teneral adult cicada recently emerged from the nymphal exuviae; bird…
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from article Cicada
Brood X periodical cicadas in Boyce, Virginia. (Photo by Louie H. Yang)
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from article Misophrioida
Side view of typical misophrioidan.
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from article Craniiformea
Isocrania egnabergensis (Retzius): (a) dorsal valve interior; (b) dorsal valve exterior; (c) ventral valve interior; (d) ventral valve exterior; (e) complete shell, lateral view, dorsal valve above; 8 mm (0.32 in.) in width. Danocrania tuberculata…
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from article Craniiformea
Muscle system of Novocrania viewed (top) dorsally and (bottom) laterally. (Adapted from O. M. B. Bulman, Muscle systems of some inarticulate brachiopods, Geol. Mag., 76:434–444, 1939; after R. L. Kaesler, ed., Treatise on Invertebrate Paleontology,…
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from article Ciliophora
A typical ciliate member of the phylum Ciliophora. (Credit: Don Loarie)
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from article Ciliophora
Illustration showing the major structures of a representative ciliate, Paramecium (phylum Ciliophora). The anterior end is shown at the top; the posterior end is shown at the bottom. (Copyright © McGraw-Hill Education)
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from article Ciliophora
Binary fission and stomatogenesis in the ciliate Tetrahymena. Argentophilic basal bodies form part of the silverline system and infraciliature.
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from article Ciliophora
Ciliates (not drawn to the same scale): (a) primitive form, Holophyra; (b) intermediate form, Tetrahymena; and (c) highly complex form, Diophrys.
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from article Proboscidea
African bush elephant (Loxodonta africana). (Credit: Gary M. Stolz/U.S. Fish and Wildlife Service)
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from article Proboscidea
Indian elephant (Elephas maximus) in Kerala region, southern India. (Credit: Nidish K. Viswanathan)
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from article Coronatae
Coronatae: (a) medusa of Periphylla; (b) medusa of Nausithoe; (c) polyp of Nausithoe. [(a, b) After F. S. Russell, The Medusae of the British Isles: II. Pelagic Scyphozoa with a Supplement to the First Volume on Hydromedusae, Cambridge University…
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from article Slime molds
Close-up view of slime mold on the ground. (Credit: Melinda Fawver/iStock/Getty Images)
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from article Slime molds
Plasmodial slime mold (Physarum polycephalum). (Credit: Jonatha M. Gott/Case Western Reserve University)
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from article Ateleopodiformes
Itimaia plicatellus, a jellynose fish found in deep water in the east-central Pacific Ocean. (Photo © John E. Randall)
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from article Pterobranchia
Anatomy of a single Rhabdopleura zooid.
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from article Pterobranchia
A single Cephalodiscus zooid removed from the tube. This mature zooid is approximately 4 mm (0.16 in.) in size.
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from article Copepoda
Stylized dorsal view, anterior up, of the adult body of three different kinds of copepods: (a) Thaumatopsylloida; (b) Poecilostomatoida, Siphonostomatoida, Harpacticoida, Cyclopoida, Misophrioida, Mormonilloida, Platycopioida, Gelyelloida, or…
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from article Copepoda
Right lateral view of a female cyclopoid copepod, anterior up, dorsal left: (a) anterior thoracic limb (maxilliped), with its somite fused to the head; (b) posterior thoracic somite fused to an anterior abdominal somite to form a somite complex; (c)…
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from article Copepoda
Steps in development of a biramal limb of a calanoid copepod, proximal up: (a) third copepodid, bud of left limb; (b) fourth copepodid, left limb, coupler and proximal part of right limb; (c) fifth copepodid, left limb, coupler and proximal part of…
