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113 results for “temnospondyls”
Figure 14 in The cranial morphology of the temnospondyl Australerpeton cosgriffi (Tetrapoda: Stereospondyli) from the Middle-Late Permian of Paraná Basin and the phylogenetic relationships of Rhinesuchidae
Figure 14. Reconstruction of Australerpeton cosgriffi in its environment (Middle–Late Permian, Rio do Rasto Formation, Paraná Basin) by Rodolfo Nogueira.
Adult branchiosaurid temnospondyls: The life cycle of Xerodromeus gracilis
<p><span>The Branchiosauridae form a clade of tiny newt-like, extinct amphibians of overall larval appearance. While their status as neotenic (perennibranchiate) forms had long been universally accepted, adult specimens are known from only one taxon that was hitherto referred to as <em>Melanerpeton</em> (<em>Apateon</em>) gracile. Here we study this life cycle in depth, which includes the only well-documented metamorphosis-like transformation in an early tetrapod outside Lisssamphibia.</span></p> <p>Based on various newly recognized features, <em>Melanerpeton gracile</em> is attributed to a new genus, <em>Xerodromeus</em>. <span><em>X. gracilis</em> </span><span>is characterized by a short postorbital skull table, wide supratemporal, quadrate condyles well posterior to the occipital ones, ossified endocranial elements, carpals, coracoid and pelvis as well as wedge-shaped intercentra and cylindrical pleurocentra, of which the latter are identified for the first time in branchiosaurids.</span></p> <p><span>The studied size classes are referred to four phases: (A) integration of jaw and cheek, longer snout, (B) stronger teeth, robust limbs, incipient ossification of exoccipital, coracoid, and pelvis, change in dermal ornament), (C) larger gape, wider skull, polygonal ornament) and (D) quadrate, coracoid, carpals, and vertebral centra ossified, during which a probably terrestrial adult morph developed. </span>Adult <em>X. gracilis</em> is more massively built than amphibamids, and its non-pedicellate dentition indicates that it was probably feeding on different prey.</p>
Adult branchiosaurid temnospondyls: The life cycle of Xerodromeus gracilis
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Data from: A new dissorophoid temnospondyl from the Allegheny Group (Late Westphalian, Carboniferous) of Five Points, Mahoning County, Ohio (USA)
<p>A small temnospondyl skull from the Upper Carboniferous Allegheny Group of Five Points, Ohio, is referred to a new dissorophoid, <i>Palodromeus bairdi</i> n. gen n. sp. The complete skull with mandibles is preserved in counterparts. It is characterized by (1) elongated slit-like choana, (2) postfrontal, postorbital, and supratemporal bearing a distinct ridge, and (3) reduced parietal only two-thirds the length of the frontal. Phylogenetic analysis confirms a dichotomy between amphibamiforms and olsoniforms and places <i>Palodromeus bairdi</i> at the base of the olsoniforms, revealing an early stage in the evolution of that clade.</p>
Dissorophoid temnospondyl Parioxys from the Permian of Texas
<p><i>Parioxys ferricolus</i> is a long-neglected taxon of dissorophid temnospondyls from the early Permian (Cisuralian) of Texas. Reexamination of the original material and preparation of a previously undescribed specimen sheds some light on ontogeny and reveals numerous eucacopine features. <i>P. ferricolus</i> is characterized by (1) a preorbital region 1.5 times as long as the posterior skull table in juveniles and twice as long in adults, (2) parietal only two-thirds the length of the frontal, and (3) interpterygoid vacuities shorter than half the skull length, (4) choanae posteriorly extended, and (5) vomer with enlarged, V-shaped medial depression. <i>P. ferricolus</i> is found nested with <i>Kamacops acervalis</i>, with which it shares synapomorphies in the palate, within the dissorophid clade Eucacopinae.</p>
Figure 2 in Osteology of the Permian temnospondyl amphibian Glanochthon lellbachae and its relationships
Figure 2. Type specimen of Glanochthon lellbachae (Krätschmer, 2006) comb. nov. (NHMM 2006/14). (a, c) Close-up of skull roof and (b) complete skeleton.
Figure 1 in The life cycle in late Paleozoic eryopid temnospondyls: developmental variation, plasticity and phylogeny
Figure 1. Larval and small juvenile specimens of Onchiodon labyrinthicus Geinitz. (a) LFUG 13530, (b) LFUG 13405, (c) MMG SaP 390, (d) LFUG 13361, (e) MMG SaP 237, (f) LFUG 13343. Dark grey shading depicts deeper levels of bone. Scale equals 10 mm.
Figure 6 in Osteology and relationships of the temnospondyl genus Sclerocephalus
Figure 6. Palates of different Sclerocephalus species. A, D, E, S. haeuseri SMNS 81791 (L–O 6); B, S. haeuseri with ossified braincase SMNK 124/276; C, S. nobilis NHMM-PW 2005/2Ls (L–O 9); F, anterior view of the stapes of S. haeuseri SMNS 81791; G, posterior view of the stapes of S. haeuseri SMNS 81791. Please refer to the text for the list of abbreviations.
Figure 8 in The evolution of the scalation pattern in temnospondyl amphibians
Figure 8. Ontogeny of gastral scales in Sclerocephalus haeuseri, and interpretation of the gastral scale morphologies of other temnospondyls and the stem-tetrapod Greererpeton burkemorani as 'larval', 'juvenile', and 'adult', respectively. Except for Sclerocephalus, the ontogenetically most advanced stages of gastral scales are shown in each case. Acerastea redrawn after Warren & Hutchinson (1987), Australerpeton redrawn after Dias & Richter (2002), Balanerpeton redrawn after Milner & Sequeira (1994), Branchierpeton redrawn after Werneburg (1991), Gerrothorax redrawn after Nilsson (1946), Greererpeton based on CMNH 11073, Mahavisaurus redrawn after Janvier (1992), Onchiodon redrawn after Credner (1893), Platyoposaurus based on PIN 164/1–9, Sclerocephalus based on MB.Am.1302, MB.Am.1233, and SMNS 90507, Uranocentrodon redrawn after Findlay (1968).
New Sclerocephalus species and temnospondyl braincase evolution
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Data from: A new dissorophoid temnospondyl from the Allegheny Group (Late Westphalian, Carboniferous) of Five Points, Mahoning County, Ohio (USA)
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Dissorophoid temnospondyl Parioxys from the Permian of Texas
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Data from: The putative lissamphibian stem-group: phylogeny and evolution of the dissorophoid temnospondyls
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