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单词 plesiosaurus
释义

plesiosaurus


Thesaurus
Noun1.Plesiosaurus - extinct marine reptile with a small head on a long neck a short tail and four paddle-shaped limbsplesiosaurus - extinct marine reptile with a small head on a long neck a short tail and four paddle-shaped limbs; of the Jurassic and Cretaceousplesiosaurarchosaur, archosaurian, archosaurian reptile - extinct reptiles including: dinosaurs; plesiosaurs; pterosaurs; ichthyosaurs; thecodontsgenus Plesiosaurus - a reptile genus of suborder Plesiosauria

Plesiosaurus


Plesiosaurus

(plē'sēəsôr`əs), genus of extinct predatory marine reptiles that arose in the Triassic period of geologic time and continued into the Jurassic and Cretaceous periods. Plesiosaurs became extinct at the close of the Mesozoic era. Fossilized skeletons of them have been found in North America, Europe, and Australia. The plesiosaur had a small, short head, a long, snakelike neck, a broad, solid body, and a short tail. It had sharp interlocking teeth, and its four paddlelike legs were similar to those of a marine turtle. In total length, Plesiosaurus ranged from 10 to 60 ft (3–18 m). The term plesiosaur is sometimes applied more generally to all forms in the order Sauropterygia, which produced two lines of marine reptiles. The Plesiosaurus is an example of one trend. The other group, the pliosaurs, evolved into forms possessing short necks and gigantic skulls; the Kronosaurus, for example, had one of the largest known reptile skulls, reaching 9 ft (2.7 m) in length, and a still unclassified pliosaur first discovered on Spitsbergen in 2006 had a 10-ft (3-m) head. Paleontological evidence suggests that plesiosaurs may have given birth to live young instead of laying eggs. Plesiosaurs are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Reptilia, order Sauropterygia.
MedicalSeeplesiosaur

plesiosaurus


  • noun

Synonyms for plesiosaurus

noun extinct marine reptile with a small head on a long neck a short tail and four paddle-shaped limbs

Synonyms

  • plesiosaur

Related Words

  • archosaur
  • archosaurian
  • archosaurian reptile
  • genus Plesiosaurus
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更新时间:2025/3/1 13:29:24