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from article Chevrotain
Water chevrotain (Hyemoschus aquaticus). (Photo by Brent Huffman; courtesy of Ultimate Ungulate)
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from article Cat
Puma (Puma concolor) and cub in forest. (Credit: Grant Faint/Stockbyte/Getty Images)
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from article Cat
A domestic cat (Felis catus) nursing her kittens. (Credit: Westend61/Getty Images)
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from article Cat
Canadian lynx (Lynx canadensis). (Credit: Erwin and Peggy Bauer/U.S. Fish and Wildlife Service)
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from article Cat
Ocelot (Leopardus pardalis). (Credit: Tom Smylie/U.S. Fish and Wildlife Service)
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from article Cat
Two cheetahs (Acinonyx jubatus). (Credit: Gary M. Stolz/U.S. Fish and Wildlife Service)
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from article Cat
Lion (Panthera leo). (Credit: Trisha M. Shears)
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from article Cat
Siberian tiger (Panthera tigris). (Credit: John and Karen Hollingsworth/U.S. Fish and Wildlife Service)
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from article Lemming
The lemming, a small burrowing rodent with short legs and stout claws adapted for digging. (Photo by Robert R. Nack, Minnesota Cooperative Fish and Wildlife Research Unit)
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from article Symphyla
Scutigerella immaculata. This symphylan is a garden and greenhouse pest. (Photo by Ivo Antušek; BioLib.cz)
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from article Symphyla
Cercus (enlarged view). (Courtesy of Robert T. Allen, Academy of Natural Sciences, Philadelphia; Amanda Lawrence, Electron Microscope Center, Mississippi State University)
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from article Cestida
Structure of Cestum veneris.
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from article Cephalochordata
European lancelet (Branchiostoma lanceolatum). (After J. E. Webb, On the populations of Branchiostoma lanceolatum and their relations with the West African lancelets, Proc. Zool. Soc. Lond., 127:131, 1956)
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from article Rhinoceros
Black rhinoceros (Diceros bicornis). (Photo courtesy of Dr. Lloyd Glenn Ingles, copyright © California Academy of Sciences)
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from article Ferret
An endangered black-footed ferret (Mustela nigripes). (Photo copyright © Joseph Dougherty)
Image
from article Siphonostomatoida
Siphonostomatoida. (a) Representative siphonostomatoid mandible; (b) brachiform maxilla (after Z. Kabata, Parasitic Copepoda of British Fishes, vol. 152, Ray Society, London, 1979). (c) Representative female caligid; (d) female Pennella (after P. A.…
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from article Holothuroidea
Cucumaria, a representative holothurian.
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from article Holothuroidea
Holothurian anatomy.
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from article Calanoida
Diaptomus. (a) Lateral view of male. (b) Dorsal view of female.
Image
from article Ophiuroidea
Representative ophiuroids, which have a quite distinctive shape. (a) Ophiopeza cylindrica (alternatively, Pectinura cylindrica). (b) Asteroporpa australiensis (alternatively, Astroporpa wilsoni). (c) Gorgonocephalus chilensis.
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from article Ophiuroidea
External features of the ophiuroid Amphiura. (a) Aboral view. (b) Adoral view.
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from article Malacostraca
Caridoid facies. (After E. R. Lankester, ed., A Treatise on Zoology, pt. 7, fasc. 3, A. and C. Black, 1909)
Image
from article Malacostraca
Representative malacostracan thoracic appendages: (a) biramous ambulatory thoracic appendage of an Anaspidacea; (b) uniramous thoracic walking leg of a Stenopodidea; (c) first maxilliped of a Paguroidea; (d) third maxilliped of a Thalassinoidea; (e)…
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from article Pauropoda
A typical pauropod (genus Allopauropus) with bifurcate antennae, 9 pairs of legs, and a well-developed anal pygidium. The anterior part of the animal is located toward the top right-hand corner of the image. (Photo by Andy Murray)
Image
from article Monogenea
Two Monopisthocotylea (a, b) and two Polyopisthocotylea (c, d). From left to right: Pseudohaliotrema carbunculus, Heterocotyle aetobatis, Heteronchocotyle leucas, and Heteraxinoides xanthophilis.
Image
from article Monogenea
Life cycles of Monogenea. From left to right: (a) Gyrodactylus funduli (note embryos within embryos), (b) Polystoma integerrimum (note two types of adults either on the gills and skin of tadpoles or in the bladder), and (c) Diplozoon species (note…
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from article Cydippida
Typical Pleurobrachia sp.
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from article Characiformes
Banded tetra (Astyanax fasciatus), a member of the family Characidae in the order Characiformes. (Photo by James St. John)
Image
from article Characiformes
Redeye piranha (Serrasalmus rhombeus), a member of the family Serrasalmidae in the order Characiformes. [Photo from T. P. Carvalho et al., Fishes from the upper Yuruá river, Amazon basin, Peru, Check List, 5(3):673–691, 2009]
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from article Characiformes
Spotfin hatchetfish (Thoracocharax stellatus), a member of the family Gasteropelecidae in the order Characiformes. [Photo from T. P. Carvalho et al., Fishes from the upper Yuruá river, Amazon basin, Peru, Check List, 5(3):673–691, 2009]
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from article Lamniformes
Representatives of the seven Lamniformes families. (a) Odontaspididae. (b) Mitsukurinidae. (c) Pseudocarchariidae. (d) Megachasmidae. (e) Alopiidae. (f) Cetorhinidae. (g) Lamnidae. (Illustration courtesy of J. S. Nelson, Fishes of the World, 4th…
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from article Lamniformes
Smalltooth sand tiger shark (Odontaspis ferox), a member of the family Odontaspididae in the order Lamniformes. (Photo courtesy of Ocean Explorer, Office of Ocean Exploration and Research, National Oceanic and Atmospheric Administration)
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from article Scorpaeniformes
Stonefish (Synanceia verrucosa). (Photo copyright © John E. Randall)
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from article Scorpaeniformes
Cabezon (Scorpaenichthys marmoratus), a type of sculpin belonging to the family Cottidae (order Scorpaeniformes). (Photo by Chad King, Monterey Bay National Marine Sanctuary, National Oceanic and Atmospheric Administration)
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from article Digenea
Diagrams of various adult types of digenean trematodes. (After R. M. Cable, An Illustrated Laboratory Manual of Parasitology, Burgess, Minneapolis, 1940)
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from article Digenea
Digenean trematode life cycle. (After R. M. Cable, An Illustrated Laboratory Manual of Parasitology, Burgess, Minneapolis, 1940)
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from article Ctenothrissiformes
A Cretaceous ctenothrissiform fossil, Ctenothrissa sp. (order Ctenothrissiformes), on a limestone matrix found in Lebanon. Size: 90 mm (3.5 in.). (Photo courtesy of The Virtual Fossil Museum)
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from article Acari
Parasitiformes body plan. Lateral view of a predatory adult female Mesostigmata showing major body regions and important structures. Scale bar = 0.1 mm (0.004 in.). (Scanning electron micrograph by D. E. Walter)
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from article Acari
Acariformes body plan. (a) Adult female Oribatida (Sarcoptiformes) in lateral view showing major body regions and important structures. (b) Hexapod larva (Trombidiformes): dorsal view of a chigger, a parasite of vertebrates. (c) Octopod deutonymph…
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from article Haplosporida
Spore of Urosporidium fuliginosum.
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from article Haplosporida
Stages in the development of Icthyosporidium giganteum.
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from article Urodela
A typical member of the order Urodela: the longtail salamander (Eurycea longicauda). (Credit: Ryan Hagerty/U.S. Fish and Wildlife Service)
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from article Urodela
Southern dwarf siren (Pseudobranchus axanthus), which has undergone limb degeneration and retains only tiny forelimbs. (Credit: U.S. Geological Survey)
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from article Urodela
World distribution of salamanders (order Urodela), indicated by areas of shaded blue color. (Copyright © McGraw Hill)
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from article Urodela
California tiger salamander (Ambystoma californiense). (Credit: John Cleckler/U.S. Fish and Wildlife Service)
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from article Urodela
The two-toed amphiuma salamander (Amphiuma means). (Credit: Southeast Ecological Center, U.S. Geological Survey)
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from article Urodela
The northern red salamander (Pseudotriton ruber ruber) is a member of the family Plethodontidae. (Credit: Alicia Lafever/U.S. National Park Service)
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from article Chamois
Alpine chamois (Rupicapra rupicapra). (Photograph courtesy of Brent Huffman/Ultimate Ungulate Images)
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from article Amniota
Basic types of vertebrate eggs.
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from article Amniota
Embryo developing in amniote eggs.
