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Amphibian

  • Kartonierter Einband
  • 160 Seiten
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Amphibians (class Amphibia), such as frogs, toads, salamanders, newts, and caecilians, are ectothermic (or cold-blooded) animals t... Weiterlesen
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Beschreibung

Amphibians (class Amphibia), such as frogs, toads, salamanders, newts, and caecilians, are ectothermic (or cold-blooded) animals that metamorphose from a juvenile water-breathing form, to an adult air-breathing form. Though amphibians typically have four limbs, the Caecilians are notable for being limbless. Unlike other land vertebrates (amniotes), amphibians lay eggs in water. Amphibians are superficially similar to reptiles. Amphibians are ecological indicators, and in recent decades there has been a dramatic decline in amphibian populations around the globe. Many species are now threatened or extinct. Amphibians evolved in the Devonian Period and were top predators in the Carboniferous and Permian Periods, but many lineages were wiped out during the Permian-Triassic extinction. One group, the metoposaurs, remained important predators during the Triassic, but as the world became drier during the Early Jurassic they died out, leaving a handful of relict temnospondyls like Koolasuchus and the modern orders of Lissamphibia.

Produktinformationen

Titel: Amphibian
Untertitel: Frog, Toad, Salamander, Newt, Caecilian, Metamorphosis, Reptile, Amniote, Ecological indicator, Decline in amphibian populations, Devonian, Carboniferous
Editor:
EAN: 9786130265090
ISBN: 978-613-0-26509-0
Format: Kartonierter Einband
Herausgeber: Alphascript Publishing
Genre: Biologie
Anzahl Seiten: 160
Gewicht: 256g
Größe: H220mm x B150mm x T10mm
Jahr: 2009