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from article Civet
Owston's palm civet (Chrotogale owston). (Photo copyright © by Mark Kostich)
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from article Patellogastropoda
Whitecap limpet (Acmaea mitra). (Photo by Douglas Eernisse)
Image
from article Patellogastropoda
Ribbed Mediterranean limpet (Patella ferruginea). (Photo by Georgina Rivera Ingraham)
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from article Patellogastropoda
Radula of the patellogastropod Notoacmea scapha.
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from article Bicosoecida
A bicosoecid, Codomonas annulata.
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from article Rhizocephala
Loxothylacus texanus (arrow) attached to the abdomen of the blue crab (Callinectes sapidus). (After E. G. Reinhard, Parasitic castration of Callinectes, Exp. Parasitol., 5:79–107, 1956)
Image
from article Polychaeta
Examples of polychaetes. (a) Platynereis dumerilii antipoda. (b) Branchiomma sp. (c) Arenicola bombayensi. (After P. L. Beesley et al., 2000)
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from article Polychaeta
Platynereis dumerilii antipoda, showing the antero-dorsal end with the pharynx everted. (After P. L. Beesley et al., 2000)
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from article Polychaeta
Hololepidella laingensis; scanning electron microscope view of the anterior end with the pharynx everted. An: antennae; Pa: palps; Prb: proboscis; Prs: prostomium; TeC: tentacular cirrus. Numbers refer to the segments of the trunk. Magnification,…
Image
from article Polychaeta
Gastrolepidia clavigera; scanning electron microscope view of the anterior end. Mo: mouth; Ja: jaw; Pa: palps; Prb: proboscis. Magnification, 30×.
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from article Polychaeta
Gastrolepidia clavigera, scanning electron microscope view of the two first parapodia (Pa1, Pa2). Ch: chaetae; Ci: cirrus; Nop: notopodium; Nep: neuropodium. Magnification, 40×.
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from article Polychaeta
Section through a polychaete. (After E. E. Ruppert and R. D. Barnes, Invertebrate Zoology, Saunders College Publishing, Orlando, 1994)
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from article Chaetonotida
Marine gastrotrichs of the order Chaetonotida; dorsal views. (a) Xenotrichula (courtesy of W. D. Hummon). (b) Chaetonotus (after W. D. Hummon, Intertidal marine Gastrotricha from Colombia, Bull. Mar. Sci., 24:396–408, 1974).
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from article Star tracker
Strapdown satellite star tracker. (a) Mounting of system on the satellite. (b) Star tracker in housing. (Northrop Grumman Corp.)
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from article Star tracker
Silicon focal-plane arrays. (Northrop Grumman Corp.)
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from article Skink
Five-lined skink (Plestiodon fasciatus; formerly Eumeces fasciatus). (Credit: George W. Robinson; copyright © California Academy of Sciences)
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from article Ephemeroptera
Ephemeroptera. (a) Mayfly, adult male, Hexagenia sp., in usual resting position (after A. H. Morgan, Field Book of Ponds and Streams, G. Putnam's Sons, 1930). (b) Mayfly, subadult male, Callibaetis sp., newly emerged from water, standing on surface…
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from article Prairie dog
Black-tailed prairie dogs (Cynomys ludovicianus). (Photo by Ron Singer, U.S. Fish and Wildlife Service)
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from article Percopsiformes
Trout-perch (Percopsis omiscomaycus). (Photo by Konrad P. Schmidt)
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from article Percopsiformes
Pirate perch (Aphredoderus sayanus). (Photo by Konrad P. Schmidt)
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from article Percopsiformes
Ozark cavefish (Amblyopsis rosae). (Photo courtesy of U.S. Fish and Wildlife Service)
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from article Prosobranchia
Common gastropods. (Top left) Murex troscheli. (Middle) Conus gloriamaris. (Top right) Lambis crocata. (Bottom) Angaria vicdani.
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from article Sauropterygia
Ceresiosaurus calcagnii, ventral view.
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from article Zebu
Gray Brahman bull (Bos indicus). (Photo courtesy of Salinas Ranch, Carmine, Texas)
Image
from article Diadematoida
Two ambulacral plates of Diadema. (After T. Mortensen, A Monograph of the Echinoidea, III, C. A. Reitzel, Copenhagen, 1943)
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from article Diadematoida
Diadema antillarum on coral reef. Spines are commonly black, but white spines, as shown here, are also frequently found. (Photo courtesy of J. E. Miller)
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from article Valvatida
Valvatid pedicellariae (valvate type) on marginal plates of Hippasteria trojana.
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from article Valvatida
Three-dimensional diagram showing the main ossicles of the valvatid arm.
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from article Remipedia
Representative Remipedia. (a) Speleonectes lucayensis (after F. R. Schram, Crustacea, Oxford University Press, New York, 1986). (b) Lasionectes entrichoma [after J. Yager and F. R. Schram, Lasionectes entrichoma, new genus, new species (Crustacea:…
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from article Cumacea
A typical adult male cumacean.
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from article Coronoidea
Stephanocrinus gemmiformis, Middle Silurian, Tennessee; side view of the theca.
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from article Macrostomorpha
Macrostomum lignano, a new species from the northern Adriatic near Lignano, Italy. (a) Photomicrograph of a living, slightly squeezed worm. (b) Diagram showing the major organ systems. (From L. Schärer, G. Joss, and P. Sandner, Mating behavior of…
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from article Myzostomida
Scanning electron microscopy view of the ventral side of the Indo-Pacific Myzostoma ambiguum showing the parapodia and the marginal cirri. The individual is 4 mm (0.16 in.) long.
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from article Myzostomida
Scanning electron microscopy view of the ventral side of the Atlantic Myzostoma cirriferum metatrochophore. The larva is 0.05 mm (0.002 in.) long.
Image
from article Doppler VOR
Collocation of Doppler VOR and TACAN beacons installed on 100-foot high (30-m) tower with a counterpoise of 119-ft (36-m) diameter in forest near Frankfurt, Germany. Circular array consists of 39 loop antennas fed by solid-state commutator. Center…
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from article Doppler VOR
Principle of Doppler VOR beacon. Reference signal R and bearing signal V which is generated by dipole d are shown as they would be measured in aircraft to the north, east, south, and west of the beacon. (a) Dipole d at 180°. (b) Dipole d at 270°.…
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from article Doppler VOR
Comparison of radial flight recordings. (a) From VOR installation. (b) From DVOR installation. Both experimental beacons were located at same unfavorable site. Plane is flying constant course at bearing of 133° from beacons at 4000-ft (1.2-km)…
Image
from article Killer whale
Killer whales (Orcinus orca) in the waters off Alaska. (Credit: David Ellifrit/Alaska Fisheries Science Center, National Oceanic and Atmospheric Administration)
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from article Killer whale
The tail of a killer whale. (Credit: Janice Waite/Alaska Fisheries Science Center, National Oceanic and Atmospheric Administration)
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from article Grylloblattodea
Dorsal view of the first ice crawler species to be described: Grylloblatta campodeiformis. (Redrawn from the original paper by E. M. Walker, A new species of Orthoptera, forming a new genus and family, Can. Entomol., 46(3):93–99, 1914)
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from article Mink
American mink (Neovison vison; alternatively, Mustela vison). (Photo courtesy of Isle Royale National Park, Michigan; U.S. National Park Service)
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from article Stickleback
Nine-spine stickleback (Pungitius pungitius). (Photo by Konrad P. Schmidt)
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from article Stickleback
Three-spine stickleback (Gasterosteus aculeatus). (Bob Jenkins and Noel Burkhead; EFISH )
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from article Lepisosteiformes
Spotted gar (Lepisosteus oculatus). (Photo by Brian Montague, U.S. Fish and Wildlife Service)
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from article Euglenida
Euglenids. (a) Euglena pisciformis. (b) Phacus strokesii. (c) Cross section of cell.
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from article Otter
North American river otter (Lontra canadensis). (Credit: Alan and Sandy Carey/Getty Images)
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from article Otter
Sea otter (Enhydra lutris) in the water off the coast of Moss Landing, California. (Credit: Lilian Carswell/U.S. Fish and Wildlife Service)
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from article Echiura
Echiuran anatomy. (a) External anatomy, ventral view. (b) Internal anatomy, dorsal view. A, anus; AV, anal vesicles; G, gut (middle section removed for clarity); M, mouth; N, nephridia (egg and sperm storage organs); S, setae; VNC, ventral nerve…
Image
from article Schizomida
Schizomus sawadai. (After K. Sekiguchi and T. Yamasaki, A redescription of “Trithyreus sawadi” (Uropygi: Schizomidae) from the Bonin Islands, Acta Arachnol., 24(2):73–81, 1972)
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from article Notomyotida
Some diagnostic features of representative Notomyotida. (a) Paxillae and one pectinate pedicellariae of Cheiraster richardsoni. (b) Benthopecten pentacanthus.
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from article Jerboa
Jerboa. (Credit: Pekka Fågel)
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from article Ratites
Ostrich (Struthio camelus massaicus). (Photo courtesy of Gerald and Buff Corsi, copyright © California Academy of Sciences)
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from article Ratites
Greater rhea (Rhea americana). (Photo courtesy of Dr. Lloyd Glenn Ingles, copyright © California Academy of Sciences)
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from article Sextant
Marine sextant.
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from article Sextant
Periscopic sextant for use in aircraft.
Image
from article Choanoflagellida
A linear colony of the choanoflagellate, Desmarella moniliformis.
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from article Trematoda
Phylogeny of the Neodermata. Note that the monophyly of the Neodermata has been confirmed by many morphological and DNA studies. The phylogeny of the various neodermatan subgroups may have to be revised on the basis of studies using mitochondrial…
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from article Trematoda
Furcocercaria of Schistosoma. Note the forked tail.
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from article Trematoda
Eggs of Schistosoma species. Note the differently developed spine and egg shape in the various species shown.
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from article Trematoda
Paragonimus species. Note the spinose tegument. Worms are about 1.5 cm (0.6 in.) in length.
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from article Acantharea
Representatives of the Acantharea; Acanthometra pellucida, (a) showing axial rods extending through the central capsule, and myonemes (myophrisks) extending from the rods to the sheath; (b) contracted myophrisks with expanded sheath; and (c) relaxed…
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from article Vertebrata
The subphylum Vertebrata constitutes the largest natural group (clade or monophyletic group) of chordate animals (members of the phylum Chordata). The asterisk indicates that birds are included in the reptile group. (Copyright © McGraw Hill)
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from article Ophiurida
Brittle star, Ophiolepis impressa (order Ophiurida, family Ophiolepididae), found on coral reefs in the tropical western Atlantic. (After G. Hendler et al., Sea Stars, Sea Urchins and Allies: Echinoderms of Florida and the Caribbean, Smithsonian…
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from article Neritimorpha
Female Nerita laying egg capsules.
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from article Neritimorpha
Sea grass snail Smaragdia with cryptic green coloration.
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from article Neritimorpha
Red-blooded Phenacolepas limpets.
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from article Hedgehog
European hedgehog (Erinaceus europaeus). (Photo by James Brian Bottomley and Sheila Bottomley)
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from article Gastornithiformes
Gastornis giganteus (reconstruction), an extinct flightless bird belonging to the order Gastornithiformes. (Photo courtesy of the American Museum of Natural History, New York)
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from article Thermosbaenacea
An ovigerous female, Thermosbaena (Thermosbaenacea). (After D. Barker, A study of Thermosbaena mirabilis (Malacostraca, Peracarida) and its reproduction, Quart. J. Micro. Sci., 103:261–286, 1962)
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from article Gaviiformes
Common loon (Gavia immer) at Jammer Lake, Minnesota. (Photograph copyright © DonGettyPhoto.com)
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from article Amoebida
Typical ameboid locomotion. (a) Thecamoeba verucosa, locomotion without formation of distinct pseudopodia. (b) Mayorella bigemia, formation of conical pseudopodia. (c) Amoeba proteus, formation of large pseudopodia. (d) Amoeba dubia, formation of a…
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from article Amoebida
Commensal and parasitic amebas. (a–e) Entamoeba coli: (a) rounded form; (b) cyst; (c) multinucleate cyst; (d) typical cyst from naturally infected monkey; (e) octunucleate cyst. (f–k) E. histolytica: (f) ameboid form; (g) cyst with glycogen vacuole;…
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from article Amoebida
Nonpathogenic amebas. (a–e) Endolimax nana: (a) ameboid stage; (b) cyst from monkey; (c–e) cyst from human. (f–n) Iodamoeba bütschlii: (f) ameboid stage; (g, h) ameboid stage, medium size; (i) ameboid stage, small size; (j) ameboid stage, large…
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from article Myctophiformes
Luminous lanternfish (Lampadena luminosa). (Photo courtesy of the SEFSC Pascagoula Laboratory, Collection of Brandi Noble, Southeast Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration)
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from article Air-traffic control
Terminal radar controller's plan view display. Aircraft positions are shown by radar returns. Display is centered on primary airport with parallel and intersecting runways. Range rings are spaced 5 mi (9 km) apart. Airspace within boundary and above…
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from article Sclerosponges
Skeleton of Astrosclera, with astrorhizal patterns on surface.
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from article Sclerosponges
Skeletal reticulum of Astrosclera showing spherulitic arrangement of crystalline units.
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from article Sclerosponges
Surface calicles of Ceratoporella showing protruding siliceous spicules. (From W.D.Hartman and T.F.Goreau, Trans.Conn.Acad.Arts Sci., 44:131–148, 1972)
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from article Sclerosponges
Acanthochaetetes wellsi. (a) Skeleton with astrorhizal patterns on surface. (b) Calicles viewed from above; two developing asexual buds are seen in lower left. (c) Longitudinal fracture of calcitic skeleton showing rows of spines in calicles.
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from article Insect flight muscle
A flame skimmer dragonfly is a common insect found in western North America. The elements of the dragonfly's muscular system that have evolved over time provide this animal with a highly specialized ability of flight. (Credit: Cyndi Souza/U.S. Fish…
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from article Insect flight muscle
Two types of insect musculature: (a) direct flight muscle; (b) indirect flight muscle. (Credit: Based on an original illustration by R. Eckert, D. Randall, and G. Augustine)
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from article Insect flight muscle
A bee uses indirect flight muscles to hover over a pussy willow blossom while collecting pollen. The hairs on the bee, as well as its legs, are covered in yellow pollen. (Credit: Dave Massey/Shutterstock)
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from article Labyrinthulia
Labyrinthula zopfi: (a) portion of living network, (b) two organisms stained, (c) encysted stage. Labyrinthula macrocystis: (d) vegetative network, (e) single organism stained. (After R. P. Hall, Protozoology, Prentice Hall, 1953)
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from article Barracuda
Great barracuda (Sphyraena barracuda). (Photo copyright © John E. Randall)
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from article Xenophyophorida
Xenophyophorids. (a) Stannoma dendroides. (b) Stannophyllum zonarium. (c) Psammetta erythrocytomorpha, section showing interlacing tubules and dark inclusions of uncertain nature.
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from article Musk-ox
Musk-ox (Ovibos moschatus). (Photo courtesy of Brent Huffman/Ultimate Ungulate Images)
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from article Marten
American marten (also known as the American pine marten; Martes americana). (Photo by Gerald and Buff Corsi; copyright © California Academy of Sciences)
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from article Sheep
Domesticated sheep (Ovis aries). (Credit: Natural Resources Conservation Service, U.S. Department of Agriculture)
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from article Sheep
Katahdin sheep, which comprise a breed of hair sheep. (Credit: Agricultural Research Service, U.S. Department of Agriculture)
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from article Opossum
Virginia opossum (Didelphis virginiana).
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from article Nummulites
The planispirally enrolled whorls of the shell of a nummulite (genus Nummulites) in a borehole core through the El Garia Formation (Early Eocene) of the Hasdrubal gas field, offshore Tunisia. The diameter of the nummulite is 14.6 mm (0.58 in.).…
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from article Bear
Black bear (Ursus americanus). Black bears often have brown fur. (Credit: Tom Brakefield; copyright © California Academy of Sciences)
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from article Bear
Polar bears (Ursus maritimus) on Wrangel Island in the Arctic. (Credit: Nikita G. Ovsyanikov)
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from article Gymnotiformes
Gymnotus chaviro, a type of nakedback knifefish in the family Gymnotidae (order Gymnotiformes), from the Alto Purús region of Peru. Length: 79 mm (3.1 in.). (Photo courtesy of J. S. Albert, Department of Biology, University of Louisiana at…
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from article Gymnotiformes
Eigenmannia virescens, a type of glass knifefish in the family Sternopygidae (order Gymnotiformes), from the Bajo Urubamba region of Peru. Length: 126 mm (5 in.). (Photo courtesy of J. S. Albert, Department of Biology, University of Louisiana at…
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from article Cypriniformes
Koi carp (Cyprinus carpio carpio). (Photo copyright © by J. J. Photo)
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from article Amphibia
The yellow-spotted salamander (Ambystoma maculatum) is a common amphibian found in the eastern United States. (Credit: Wirepec/Getty Images)
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from article Amphibia
The closest evolutionary relatives of amphibians are lobe-finned fishes, from which they evolved. The fins of lobe-finned fishes became the limbs of early amphibians. (Copyright © McGraw Hill)
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from article Amphibia
Reconstruction of the skeleton of the Devonian amphibian known as Acanthostega. Scale bar = 40 mm (1.6 in.). (Credit: Michael I. Coates)
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from article Social insects
Formosan subterranean termites (Coptotermes formosanus) feeding on stained filter paper. (Credit: Scott Bauer/Agricultural Research Service, U.S. Department of Agriculture)
