Istiodactylus

  • istiodactylus
    temporal range: early cretaceous, 125–120 ma
    preЄ
    Є
    o
    s
    d
    c
    p
    t
    j
    k
    pg
    n
    istiodactylus.tif
    skull fragments of istiodactylus specimen nhmuk r3877, and witton's 2012 reconstruction of the complete skull
    scientific classification e
    kingdom: animalia
    phylum: chordata
    order: pterosauria
    suborder: pterodactyloidea
    family: istiodactylidae
    genus: istiodactylus
    howse, milner, & martill, 2001
    type species
    ornithodesmus latidens
    seeley, 1901
    species

    i. latidens (seeley, 1901)?i. sinensis andres & qiang, 2006

    synonyms
    • ornithodesmus latidens seeley, 1901

    istiodactylus is a genus of pterosaur that lived during the early cretaceous period, about 120 million years ago. the first fossil was discovered on the english isle of wight in 1887, and in 1901 became the holotype specimen of a new species, o. latidens (latin for "wide tooth"), in the genus ornithodesmus. this species was moved to its own genus, istiodactylus, in 2001; this name is greek for "sail finger". more specimens were described in 1913, and istiodactylus was the only pterosaur known from three-dimensionally preserved fossils for much of the 20th century. in 2006, a species from china, i. sinensis, was assigned to istiodactylus, but it has since been found to belong to a different genus.

    istiodactylus was a large pterosaur; estimates of its wingspan range from 4.3 to 5 metres (14 to 16 ft). its skull was about 45 centimetres (18 in) long, and was relatively short and broad for a pterosaur. the front of the snout was low and blunt, and bore a semicircle of 48 teeth. the triangular teeth were closely spaced, interlocked, and formed a "razor-edged" outline. the lower jaw also had a tooth-like projection that occluded with the teeth. the skull had a very large naso-antorbital opening (which combined the antorbital fenestra and the opening for the bony nostril) and a slender eye socket. some of the vertebrae were fused into a notarium, to which the shoulder blades connected. it had very large forelimbs, with a wing-membrane distended by a long wing-finger, but the hindlimbs were very short.

    until the 21st century, istiodactylus was the only known pterosaur of its kind, and was placed in its own family, istiodactylidae, within the group ornithocheiroidea. istiodactylus differed from other istiodactylids in having a proportionally shorter skull. the distinctive teeth of istiodactylus indicate that it was a scavenger that may have used its teeth to sever morsels from large carcasses in the manner of a cookie cutter. the wings of istiodactylus may have been adapted for soaring, which would have helped it find carcasses before terrestrial carnivores. istiodactylus is known from the wessex formation and the younger vectis formation, which represent river and coastal environments that were shared with various pterosaurs, dinosaurs, and other animals.

  • description
  • history of discovery
  • classification
  • palaeobiology
  • palaeoecology
  • see also
  • references
  • bibliography

Istiodactylus
Temporal range: Early Cretaceous, 125–120 Ma
Istiodactylus.tif
Skull fragments of Istiodactylus specimen NHMUK R3877, and Witton's 2012 reconstruction of the complete skull
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Order: Pterosauria
Suborder: Pterodactyloidea
Family: Istiodactylidae
Genus: Istiodactylus
Howse, Milner, & Martill, 2001
Type species
Ornithodesmus latidens
Seeley, 1901
Species

I. latidens (Seeley, 1901)?I. sinensis Andres & Qiang, 2006

Synonyms
  • Ornithodesmus latidens Seeley, 1901

Istiodactylus is a genus of pterosaur that lived during the Early Cretaceous period, about 120 million years ago. The first fossil was discovered on the English Isle of Wight in 1887, and in 1901 became the holotype specimen of a new species, O. latidens (Latin for "wide tooth"), in the genus Ornithodesmus. This species was moved to its own genus, Istiodactylus, in 2001; this name is Greek for "sail finger". More specimens were described in 1913, and Istiodactylus was the only pterosaur known from three-dimensionally preserved fossils for much of the 20th century. In 2006, a species from China, I. sinensis, was assigned to Istiodactylus, but it has since been found to belong to a different genus.

Istiodactylus was a large pterosaur; estimates of its wingspan range from 4.3 to 5 metres (14 to 16 ft). Its skull was about 45 centimetres (18 in) long, and was relatively short and broad for a pterosaur. The front of the snout was low and blunt, and bore a semicircle of 48 teeth. The triangular teeth were closely spaced, interlocked, and formed a "razor-edged" outline. The lower jaw also had a tooth-like projection that occluded with the teeth. The skull had a very large naso-antorbital opening (which combined the antorbital fenestra and the opening for the bony nostril) and a slender eye socket. Some of the vertebrae were fused into a notarium, to which the shoulder blades connected. It had very large forelimbs, with a wing-membrane distended by a long wing-finger, but the hindlimbs were very short.

Until the 21st century, Istiodactylus was the only known pterosaur of its kind, and was placed in its own family, Istiodactylidae, within the group Ornithocheiroidea. Istiodactylus differed from other istiodactylids in having a proportionally shorter skull. The distinctive teeth of Istiodactylus indicate that it was a scavenger that may have used its teeth to sever morsels from large carcasses in the manner of a cookie cutter. The wings of Istiodactylus may have been adapted for soaring, which would have helped it find carcasses before terrestrial carnivores. Istiodactylus is known from the Wessex Formation and the younger Vectis Formation, which represent river and coastal environments that were shared with various pterosaurs, dinosaurs, and other animals.

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català: Istiodactylus
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polski: Istiodaktyl
русский: Istiodactylus
srpskohrvatski / српскохрватски: Istiodactylus
中文: 帆翼龍屬