Yozshulabar The canals for the olfactory nerve N. Paris 6, Paris, 76 pp. A similar angulation is present in many short-faced temnospondyls but in P. A comprehensive list of synonyms and citations to Plagiosuchus pustuliferus in the literature is provided by Hellrung In Plagiosuchus pustuliferusthe adaptive requirements for expansion of the jaw-closing musculature is puzzling. File:Gerrothorax pustuloglomeratus.
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Yozshulabar The canals for the olfactory nerve N. Paris 6, Paris, 76 pp. A similar angulation is present in many short-faced temnospondyls but in P. A comprehensive list of synonyms and citations to Plagiosuchus pustuliferus in the literature is provided by Hellrung In Plagiosuchus pustuliferusthe adaptive requirements for expansion of the jaw-closing musculature is puzzling.
File:Gerrothorax pustuloglomeratus. JPG Anterolaterally, the exoccipitals contact the otics, has a prominent anterolateral projection which has not been which are mediolaterally elongated and have massive lateral observed in other basal tetrapods. This specimen featured pustular type ornamentation, and on that basis von Huene referred the specimen to P.
The degree of ossification of the from the Middle Triassic helprung Germany is described for the epipterygoid, however, is subject to individual variation obvi- first time, based on outer morphological observations and ously independent from ontogenetic changes. Posterior to the large foramen for ramus of pterygoid. In SMNS a foramen appears to be present in the same position, although there is severe deformation in this area.
A new look at members of the Superfamily Brachyopoidea Amphibia, Temnospondyli from the Early Triassic of Queensland and a preliminary analysis of brachyopoid relationships. Click here to sign up. Plagiosauridae The squamosal bears a deep descending epipterygoid and quadrate was probably bridged by carti- flange that sutures medioventrally with the ascending lage in the living animal, as reconstructed, for example, lamina of the pterygoid, ventrally with the quadrate and by Romer and Witter in Edops and Shishkin laterally with the quadratojugal Fig.
We express our gratitude to the collectors W. Studies on braincases of lower tetrapods: In Stapes adult Sclerocephalus, the blade-like stapes developed into a rather conventional rod-like element with distinct footplate The stapes of Gerrothorax is blade-like and bears a promi- and ventral process, although retaining a quadrate process nent anterolateral projection in its proximal part, a that was absent throughout stereospondyls proper Schoch morphology which is unique among basal tetrapods.
The ectopterygoids are particularly poorly preserved and their contacts with the palatine anteriorly and pterygoid posteriorly cannot be determined with certainty. Plagiosaurus depressus Jaekel, from the Upper Triassic of Germany is too fragmentary for fruitful comparison. Gerrothorax pulcherrimus from the ed. The skull of G.
File:Gerrothorax — Wikimedia Commons From this limited set of data, and in the absence of crucial anatomical information particularly on musculatureonly limited conclusions can be drawn with regard to what was probably a highly elaborate functional system. A revision of hellfung plagiosaurid Plagiosternum the Carboniferous of Scotland. The narrow mouth, which opened only anteriorly, and the weak dentition suggest a focus on small prey which was captured by specifically directed suction.
Generally, the paroccipital que, dorsolaterally directed suture Fig. In rated from each other. For instance, the relative elongation of the skull in Plagiosuchus pustuliferuscompared with Plagiosternum granulosum or Gerrothorax spp. Neither premaxilla was preserved. The stape- the sella turcica near the base of the cultriform process. The otics in a posterior direction, and the vertical column is are variably ossified in temnospondyls.
These are the Plagiosaurinae, which include of neurocranium and palatoquadrate gerrotjorax tetrapods, provid- the Upper Triassic Plagiosaurus from Germany Jaekel ing a sound basis for character polarization of the endoc- and the Middle and Upper Triassic Gerrothorax ranium and its evolution in basal tetrapods.
In spite of parietal and tabular indicates the presence of a small this, Jenkins et al. Comparative osteology of Mastodonsaurus giganteus Jaeger, from the Middle Triassic Lettenkeuper: More posteriorly, at the level of these processes are contacted by the slender ascending the anterior margin of the basal plate of the parasphe- process columella cranii of the epipterygoid see below.
The condition in Plagiosuchus pustuliferus is unknown but it seems likely that the ectopterygoid entered the vacuity margin. A low, broad crest basioc- process. Thus, it remains unclear which elements were ossified. The postparietal consists of an ornamented dorsal portion forming part of the skull roof, and an unornamented descending flange which forms part of the occipital surface. Indeed, those of the latter gerrotthorax strikingly reminiscent of the posteriorly expanded orbitotemporal openings present in leptopleuronine procolophonids Sues et al.
Cleithrum und Humerus der Stegocephalen und rezenten Amphibien. Additional material, including the material of all other plagiosaurids, is significantly more fragmentary and less abundant than that of Gerrothorax. Most 10 Related.
HELLRUNG GERROTHORAX PDF
Mezilabar The space in the dermal skull roof between the parietals Fig. Morphology and behaviour of the feeding apparatus in Cryptobranchus alleganiensis Amphibia: The splenial verrothorax postsplenial are of a similar overall size to the dentary, judging from the condition in SMNS hellruhg Each platelet is only a few millimetres in size, of an irregular shape and has several 3—4 tall a few millimetresslightly recurved, denticles attached in line on one surface. There is no evidence for an anterior palatal vacuity but the skull is not well preserved in this area. Generally, only the ascending pro- is well exposed and forms a simple outgrowth of the head cess is referred to as epipterygoid, at least in nonmamma- region. Lower jaws, lower tetrapods: In contrast to the situation in other plagiosaurid species, the occipital exposure of the quadratojugal in Plagiosuchus pustuliferus is relatively small. Ventrally, a small but distinct notch separates the sculptured lateral i.
Fauramar On the postparietals and the preserved part of the parie- tals, the tubercles and ridges are arranged in a radial pat- Institutional abbreviations. Bulletin of the Museum of Comparative Zoology Vol. Reconstruction of the skull and mandible of Plagiosuchus pustuliferus. Interestingly, there is also individual variation tening of the herrothorax in plagiosaurids and might represent a concerning the degree of palatoquadrate ossification synapomorphy of plagiosaurids. The data were visualized and processed essential regions of both units are ossified.
With regard to plagiosaurids, the anatomy of Gerrothorax spp. It remains unclear whether this The otics in SMNS are not as well preserved as forms part of the footplate or was offset. Severe compaction in the cheek region of the skull makes this area particularly difficult to interpret. Intriguingly, however, in its general skull outline and, especially, in its postcranial anatomy R. In cross section, it attains of slight dislocation of the occipital elements. Series B,1— The process extends far medi- Micro-CT scans reveal that the vertical gerrothorwx of the ally, almost up to the level of the squamosal-tabular exoccipitals extends anteriorly up to the level of the post- suture on the dermal skull roof, thus extensively overlap- parietal centres in SMNS First, all traits are apparently correlated, which indicates a functionally integrated system, and second, the helkrung features are unique even when compared with other plagiosaurids.