Suborder Serpentes – Snakes
Snakes (suborder Serpentes) appear in the
late Jurassic.
Derived from a group of lizards whose other
descendants include the Gila monster and
monitor lizards.
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Suborder Serpentes, Snakes - General Zoology - Lecture Slides, Slides of Zoology
Suborder Serpentes Snakes, Jacobson Organs, Kinetic Skull, Lateral Undulation, Lateral Force, Concertina Movement, Rectilinear Movement, Side Winding, Venom, Fangs. Above mentioned terms and points represent this lecture of general zoology course. A full series of lectures can be found in my documents.
Typology: Slides
2011/2012
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Snakes ( suborder Serpentes ) appear in the late Jurassic. Derived from a group of lizards whose other descendants include the Gila monster and monitor lizards.
Snakes are limbless and usually lack both pectoral and pelvic girdles. Remnants of a pelvic girdle can be found in pythons, boas, and a few others. The vertebrae of snakes are modified to permit quick lateral undulations.
Snakes have a highly kinetic skull that enables them to eat prey several times their own diameter. Two halves of the lower jaw joined only by muscles and skin.
Snakes usually move using lateral undulation where movement follows an S-shaped path. The snake exerts lateral force against surface irregularities.
Heavy bodied snakes use rectilinear movement where parts of the snake rest on the ground, while other parts are off the ground, stretching forward.
Side-winding allows desert vipers to move fast over loose, sandy surfaces with a minimum of surface contact. The body is thrown forward in loops.
Other snakes inject the prey with venom first. Venom is delivered through a channel in the fangs.