How To Use Synapsid In A Sentence
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Dimetrodon is neither a reptile nor a mammal, but a basal synapsid - that is, an early relative of the ancestors of mammals.
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In the dry late Permian environment many types of synapsids and reptiles flourished.
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By the way, nothing cladistically out-of-line with the term reptile, so long as we agree that Reptilia is a clade in which case it includes Aves and excludes Synapsida of which mammals are part.
Around the Web
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I was under the impression that “therapsid” always referred to a kind of synapsid reptile and was distinct from “pelycosaur” another kind of synapsid think dimetrodon.
Controversies in Evolution: 'Jurassic beaver' unearthed in China - The Panda's Thumb
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I think i’ve got this now: basal anapsid reptiles (which presumably gave rise to synapsid and sauropsid lineages) died out leaving no descendants. turtles, full diapsid reptiles closely allied to crocodiles, secondarily developed a seemingly (but not osteogenically identical) anapsid skull structure subsequently.
Report on the 2005 Creation Mega Conference, Part Four - The Panda's Thumb
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The second major group of reptiles, the synapsids, have only a single temporal opening.
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The tall neural spines of early synapsids, which in life would have been connected to neighboring spines by equally tall interspinous ligaments, may have served to prevent hyper-rotation of the vertebral column during locomotion.
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It would not be safe to assume that the synapsid temporal fenestra is strictly homologous to the lower temporal fenestra of diapsids.
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Conversely, if the fossil record does not accurately portray the first appearances of synapsids because preservation rates vary widely, then phylogenetic measures might yield a more reliable sequence of branching events.
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I think i’ve got this now: basal anapsid reptiles (which presumably gave rise to synapsid and sauropsid lineages) died out leaving no descendants. turtles, full diapsid reptiles closely allied to crocodiles, secondarily developed a seemingly (but not osteogenically identical) anapsid skull structure subsequently.
Report on the 2005 Creation Mega Conference, Part Four - The Panda's Thumb
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The skull is an example of convergent evolution with some of the ornithopods and also with the dicynodonts, an herbivorous group of early synapsids.
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Otherwise, we have more of the lumbering and vaguely stegosaur-like "stegodons" seen elsewhere in Azeroth and a bizarre mutation of basilisk that they're calling "Diemetradon" (clearly loosely inspired by the Permian-aged Dimetrodon, which, you'll note, isn't a dinosaur, but, rather, a pelycosaurian synapsid).
Howard Hughes Looks the Other Way
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The variance in the general build of the manus and pes is presumably due to scaling with respect to the wide range in body sizes seen among synapsids.
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These creatures succeeded the pelycosaurian synapsids as the rulers of the land, until they in turn were supplanted by the archosaurs during the early Triassic.
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The one and only specimen represents a sphenacodontid synapsid.
Archive 2009-05-01
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If anything, the synapsids seem more closely related to anapsids than diapsids.
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Submissions for the Synapsid gallery will still be taken, but due to formatting issues caused by blogger, will be posted in buddles of five.
Life's Time Capsule: The Synapsid Gallery
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Big canines are a consistent theme in synapsid evolution.
Life's Time Capsule: The Long Road to Failure
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Otherwise, we have more of the lumbering and vaguely stegosaur-like "stegodons" seen elsewhere in Azeroth and a bizarre mutation of basilisk that they're calling "Diemetradon" (clearly loosely inspired by the Permian-aged Dimetrodon, which, you'll note, isn't a dinosaur, but, rather, a pelycosaurian synapsid).
Howard Hughes Looks the Other Way
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Tall neural spines are also a characteristic of early synapsids.
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At least I have a start on the model, but to be honest the piece won't and sadly at this point can't be as complicated as my synapsid one.
Life's Time Capsule: Making of Karoo Sunset
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For the next 80 million years, synapsids evolved into various wolflike and bearlike predators, as well as into an array of peculiar piglike herbivores.
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Basal synapsids (things like caseids, ophiacodontids and sphenacodontids) looked superficially reptile-like, and for this reason non-mammalian synapsids have traditionally been dubbed ‘mammal-like reptiles’, and even classified within Reptilia.
Archive 2006-05-01
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The possible parallel evolution of a jaw joint that allows extensive sliding in anomodonts is not unprecedented, because other synapsids independently evolved similar features.
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Indeed, most workers recognized a geographical and temporal gap between Permo-Carboniferous ‘pelycosaurs’ and therapsid synapsids.
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Here, I have readdressed the oft-noted observation that the size of the dentary increased during the course of synapsid evolution.
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Paleozoic synapsids have been the focus of many large-scale treatments over the past century and their anatomy and interrelationships are well known.
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The temporal openings at the back of the skull that are shared by all synapsids were greatly enlarged, so that the remaining bone formed long arches.
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As Rowe points out, the early cynodonts were the first synapsids in which the brain filled the endocranial cavity.
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Land amniotes continued to diversify, and by the middle Pennsylvanian had split into several taxa, two of which would go on to dominate the Mesozoic and Cenozoic: the diapsids and the synapsids.
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Accordingly, the role of vertebral rotation in synapsid locomotion might be better investigated in terms of its effect on limb extension and recovery.
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Many years later euryapsids had vanished into the lepidosaurs sphenodon, snakes and lizards-all diapsids as a secondary change, and then there was the term “sauropsid” which I saw for the 1st time at AMNH which gathered together all non synapsids and non turtles.
Drawing a Line in the Academic Sand - The Panda's Thumb
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The hypothesis that disparate groups of synapsids independently acquired mammallike characteristics has a long pedigree.
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In reptiles and primitive synapsids, the right and left lower jaws are each made up of a number of bones, one of which is the dentary, or tooth-bearing, bone.
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I guess this lets me "improve" my hideous Alt-Permian picture, and maybe draw up a real Permian synapsid, too.
Life's Time Capsule: A Minor Delay
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Non-mammalian synapsid" is a nice, precise, accurate term, too.
Life's Time Capsule: The Synapsid Gallery
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It has therefore been suggested that the mammalian class II gene clusters arose after the separation of the synapsids and the therapsids.
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The early tetrapods of this time were amphibian-like animals that eventually gave rise to the reptiles and synapsids by the end of the Paleozoic.
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This is an example of convergent evolution; synapsids and archosaurs evolved these features independently.
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The earliest occurring and phylogenetically most primitive synapsids are the ‘pelycosaurs’ of traditional terminology.
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The amniotes in turn have two main groups: the synapsids (including mammals) and the sauropsids (including reptiles and their fossil relatives).
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I've always liked "non-mammalian synapsid," even though it takes awhile to say.
Life's Time Capsule: The Synapsid Gallery
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The term "synapsid" is increasingly used cladistically, including mammals -- thus, synapsids are not extinct at all.
Life's Time Capsule: The Synapsid Gallery
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Assuming (likely, but not certain) that turtles diverged from Eureptilia after synapsids, there remains the problem of whether turtles have turbinals.
