Therocephalia

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Therocephalia

 

(also Scylocosauroidea), an infraorder (or superfamily) of extinct reptiles of the suborder Theriodontia (subclass Synapsida) that lived in the Late Permian. Members of the infraorder were predators of small or medium size; some possibly fed on carrion. The low, massive skull preserved archaic features. In the lower jaw, for example, the posterior bones were well developed, the teeth on the buccal side of the mouth lacked supplementary cusps on the crown, and the secondary palate was absent or rudimentary. Therocephalia comprised several families. The greatest number of those described inhabited southern Africa; some are also known from East Africa, western China, and the European part of the USSR.

References in periodicals archive ?
A large lizard like creature is roaming the corridors, and though most kids would enjoy the distraction of a prehistoric creature brightening up their day, the deadly therocephalian is on the hunt.
00pm) A school detention class is thrown into chaos when a teacher is killed and the pupils run riot - unaware that a deadly therocephalian is stalking the corridors looking for its next meal.
Tonight Primeval ITV1 Wales, 7pm A deadly therocephalian attacks a school, resulting in a full-scale mobilisation of the ARC team to meet the threat of the poisonous reptile.
However, in a recently prepared specimen of the primitive therocephalian Glanosuchus (GS M796), an additional ridge occurs ventral to the nasoturbinal ridge on the lateral wall of the nasal cavity.
Consequently, its capacity to recover respiratory water vapor was probably limited as well, which suggests that the increase in the ventilation rate of this early therocephalian was likely to have been relatively modest.
The gradual expansion of the nasal respiratory chamber therefore suggests that therocephalian ventilation rates were gradually expanding as well, which is consistent with the increasingly mammallike composition of this group (Kemp 1982, 1986).
As in the therocephalian Glanosuchus, the ridges in Massetognathus are situated within the respiratory chamber, in front of the primary palate.
At present, the earliest evidence for elevated respiration rates is found in Glanosuchus, a primitive therocephalian of the middle Late Permian (approximately 260 million yr ago).
Stance and gait in the hind limb of a therocephalian mammal like reptile.
The skeleton of a baurioid therocephalian therapsid from the Lower Triassic (Lystrosaurus zone) of South Africa.
Several newly prepared fossil specimens are described, which suggest that respiratory turbinals did, in fact, occur among therocephalians and cynodonts, two groups of advanced therapsids.
Both remaining groups of therapsids, the therocephalians and the cynodonts, became increasingly mammallike in appearance during their evolution.