Amphibians fall into three classes: All amphibians are vertebrates, meaning they have backbones -- even the legless caecilians. Toads and Frogs It's worth noting that toads are actually frogs, though not all frogs are toads. When people talk about frogs -- the smooth or slimy guys with bulging eyes -- they're thinking about "true frogs," which are members of the Ranidae family.
USGS Paleontology glossary Acritarch microscopic organic structure from any of a number of organisms; common during the Proterozoic. Adaptive radiation, evolutionary radiation the rapid expansion and diversification of a group of organisms as they fill unoccupied ecological nichesevolving into new species.
Age of Mammals term found in popular books on evolutionary systematics for the Cenozoic era, beginning with the Paleocene Epoch when following the K—T end Cretaceous mass extinctionmammals underwent a huge evolutionary radiation and thus replaced reptiles as the dominant life on Earth.
The Age of Mammals has in turn been replaced by the Anthropocene or Age of Man, Holocene when humans dominate every conceivable environment and most other life forms apart from weedy species are suffering a mass extinction Yes, I know humans are also mammals, so technically speaking this is still the Age of Mammals, but I tend to think of the Age of Mammals as a period of flourishing biodiversity.
MAK Age of Reptiles term found in popular books on evolutionary systematics for the Permian through to Cretaceous periods but obviously originating with Victorian discoveries of "antediluvian monsters"when reptiles first mammal-like reptilesthen archosaurs and marine reptiles were the dominant life on Earth.
Paleontologist Edwin Colbert wrote a popular intelligent layperson book with the same title. The Age of Reptiles was followed by the Age of Mammals.
The fresco sits in the Yale Peabody Museum in New Haven, Connecticut, and was completed in after three years of work. Painted in the Renaissance fresco secco technique, The Age of Reptiles was an important cultural influence during the s—60s, images of which are often found in earlier books on paleontology, and was also the model for dinosaur toys.
Despite its somewhat outdated view of dinosaurs presenting them as slow, sluggish creaturesThe Age of Reptiles is still notable for its historical and artistic merit and as the largest natural history painting in the world. It has been an inspiration to many visitors including both Robert Bakker and Peter Dodsonwho credit it with influencing them to become paleontologists.
Dodson was nearly moved to tears upon first seeing it as a college senior. In my own case MAKa photo of this mural in a book I no longer remember which one when I was still a young child maybe 10 or so exerted a huge influence on me, like a revelation, and for the first time gave me a visual appreciation of deep time in terms of succession and transformation of various forms of plant and animal life.
To this day, this mural, along with a spindle diagram of vertebrate evolution in G. I think of Palaeos as in many ways simply an extension, update in keeping with more recent discoveries and commentary on this magnificent work.
MAK Wikipedia Agnatha name given to what was previously considered a class of jawless fish, including both Paleozoic ostracoderms and extant lampreys and hagfish. With the cladistic revolutionthe term has been replaced by more phylogenetically accurate terms such as " basal vertebrate ".
Armoured agnathans are called ostracoderms. USGS Paleontology glossary Algae generic term for photosyntheticalmost exclusively aquatic, non-vascular plants; Precambrian to recent. Algorithm In mathematics and computer science, an effective method a procedure that reduces the solution of some class of problems to a series of rote steps that give a specific and correct answer expressed as a finite list of well-defined instructions for calculating a function.
Algorithms are used for calculation, data processing, and automated reasoning. Amino acid The molecular building blocks of proteins.
The properties of a protein are determined by its particular amino acid sequence. There are 20 amino acids in the proteins of life on Earth.
Ammonite A coiled, chambered fossil shell of a cephalopod mollusc of the extinct subclass Ammonoidea. Amoeba A microscopic, single celled protozoan consisting of a naked mass of protoplasm. Once considered the simplest form of animal life, they are now known to consist of several distinct and unrelated groups of protists.
Morphologically and ecologically diverse during the late Paleozoic era, including aquatic, semi-aquatic, and terrestrial newt, snake, crocodile, and frog analogues. The traditional term "amphibian" is disliked by cladists because it does not constitute a natural clade and so is considered phylogenetically meaningless.
Hence instead terms like basal tetrapod or the names of individual clades and taxa temnospondyls, lepidospondyls, Lissamphibiaetcare used.
Nevertheless, "amphibian" can still be used in a generic sense to refer to any non-amniotic tetrapod. MAK, Perseus Digital Library Amniote major tetrapod lade that reproduce by means of an external or internal egg in which the embryo or fetus is protected and nourished by several extensive membranes.
Include reptilesbirdsand mammals. Middle Carboniferous to recent. Anagenesis the evolutionary transformation of one species over time into another, resulting in the emergence of a new character or attribute which in this case a new species from an older one.
Compare with cladogenesis and budding. Ancestor in this context, an organism, or more correctly a populationlineageor speciesthat through evolution gives rise to one or more descendants that generally belong to a distinct species or lineage.
See also common ancestor. A secular form of intelligent design. Generally does not try to explain where the rest of life or the aliens themselves, for that matter! Palaeobiology and Biodiversity Research Group:One of the very foundations of evolution and popular science today is the "geologic column." This column is made up of layers of sedimentary rock that supposedly formed over millions and even billions of .
The Eldar, or Aeldari as they were known in the Eldar Lexicon before the fall of their lost realm, or the Asuryani (followers of Asuryan) as they refer to themselves, are an ancient humanoid alien race whose vast empire once extended the width and breadth of the known galaxy.
The Aeldari Empire. The axolotl (/ ˈ æ k s ə l ɒ t əl /, from Classical Nahuatl: āxōlōtl [aːˈʃoːloːtɬ] (listen)), Ambystoma mexicanum, also known as the Mexican walking fish, is a neotenic salamander related to the tiger salamander.
Although the axolotl is colloquially known as a "walking fish", it is not a fish, but an rutadeltambor.com species originates from numerous lakes, such as Lake Xochimilco. Amphibians: Amphibians are cold-blooded, vertebrate animals who possess an aquatic gill-breathing larval stage and terrestrial, lung-breathing adult stages.
Reptiles: Reptiles are cold-blooded, vertebrate animals who possess a dry, scaly skin and lay shelled-eggs on the land. A candle for Christmas December 20, Musings posts items of historical interest from time to time.
This one is a book: a book about what happens when a candle burns, a book about chemistry -- premised on the observations of the candle. Evolution - The science of evolution: The central argument of Darwin’s theory of evolution starts with the existence of hereditary variation. Experience with animal and plant breeding had demonstrated to Darwin that variations can be developed that are “useful to man.” So, he reasoned, variations must occur in nature that are favourable or useful in some way to the organism itself in the.