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Handbook of Paleoherpetology / Saurischia

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Handbook of Paleoherpetology / Saurischia

Rodney Steel (Broschiert, Englisch)

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Beschreibung

Order Saurischia SEELEY 18881 (Dinosauria OWEN 1842 [in part), Pachypodes MEYER 1845 [in part], Ornithoscelida HUXLEY 1869 [in part), Deinosauria WATSON 1957 [in part]) Archosaurian reptiles characterised by the possession of a tri-radiate pelvic girdle. Skull derivable from that of the more generalized pseudosuchians, but usually proportionately smaller, with a shorter face and a deeper and more abbreviate post-orbital region. Premaxilla little expanded posterolaterally, maxilla of large size and forming part of the external narial margin. A well developed antorbital vacuity is present, and additional accessory openings are of frequent occurrence. Both the postfrontal and the postparietal are absent, and the parietals frequently fuse. The supratemporal and infratemporal fenestrae are well developed, whilst the otic notch is widely open and markedly overhung by the squamosal. Choanae situated in a comparatively anterior position, the premaxillae entering their margins and articulating with the vomers. Pterygoids with well developed flanges and extensive palatal rami, the two elements meeting medially but never co-ossifying; a distinct pterygoid vacuity persists. Quadratojugal sheathing most of the external surface of the quadrate and ascending to or towards the squamosal. Braincase (particularly in the basioccipital and basisphcnoid region) very short and deep, with prominent basal tubera and elongate basipterygoid processes. Lower jaw bearing a well developed retroarticular process but no coronoid process. Teeth usually of comparatively simple structure, from 3-5 elements generally being present in the premaxillary dentition, and about 15 in both the maxilla and dentary. Presacral vertebrae numbering approximately 23-25. Trunk short, with only 10-1 5 dorsal elements, the transverse processes in this region being markedly elongate. The cervical ribs arc long and slender. Coracoid subcircular in outline and containing a coracoid foramen. Carpus short, with poorly ossified carpals; digits V and IV of manus variably reduced. Pelvis typically tri-radiate, with a persistently strong symphysis. Iliac blade tall and moderately expanded antero-posteriorly; the acetabulum is perforate, all three pelvic elements entering its margin. Pubis slender and elongate with an enlarged distal termination, ischium likewise slender but with a triangular, plate-like expansion proximally. Articular head of femur medially directed, with the formation of a neck and the development of a greater (and usually also a 'lesser') trochanter. Distal tarsals (where not cartilaginous) in the form of flat discs apposed to the metatarsals. Pes digitigradc, the fifth toe being diminutive or absent. Middle Triassic-Upper Cretaceous. … Weniger zeigen

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Produktinformationen

Technische Daten

Erscheinungsdatum

01.01.1970

Sprache

Englisch

EAN

9783899370294

Herausgeber

Pfeil, F

Serien- oder Bandtitel

Handbook of Paleoherpetology

Sonderedition

Nein

Autor

Rodney Steel

Seitenanzahl

Auflage

Einbandart

Broschiert

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