protoavis การใช้

• He also supported the Protoavis hypothesis by Sankar Chatterjee.
• This suggests that portions of " Protoavis " may be drepanosaurid in nature.
• It also included controversial specimens Chatterjee identified as being avian ( " Protoavis " ).
• The femur of " Protoavis " is astonishingly similar to non-tetanurans, namely coelophysoids.
• The braincase is where " Protoavis " comes close to being as avian as Chatterjee has maintained.
• "Everywhere one turns; the very fossils ascribed thereto challenge the validity of " Protoavis ".
• However, this description of " Protoavis " assumes that " Protoavis " has been correctly interpreted as a bird.
• However, this description of " Protoavis " assumes that " Protoavis " has been correctly interpreted as a bird.
• Feduccia's " protoavis " had membranes on the forelimbs only and was fashioned on the model of " Megalancosaurus ".
• A tibiotarsus is absent, unusual considering Chatterjee's claims for the pygostylian affinity of " Protoavis ", as is a tarsometatarsus.
• The author very much agrees with Chiappe in arguing that at present, " Protoavis " is irrelevant to the phylogenetic reconstruction of Aves.
• Chatterjee presents the skull of " Protoavis " as complete, although only the caudal aspect of the cranium is represented in the available fossils.
• Curiously, Gregory Paul has noted that the cervicals of " Protoavis " and drepanosaurs are astonishingly similar, such they are hardly distinguishable from one another.
• The resemblance between the femur of " Protoavis " and that of a non-tetanuran theropod becomes ever more pronounced at the distal end of the bone.
• While further material from the Dockum beds may vindicate this peculiar archosaur, for the time being, the case for " Protoavis " is non-existent ."
• Due to the nature of the bones being jumbled into sandstone nodules, and completely disarticulated, it has been suggested that " Protoavis " was reworked from later sediments.
• "As there remains no compelling data to support the avian status of " Protoavis " or taxonomic validity thereof, it seems mystifying that the matter should be so contentious.
• These data render the assertion of prokinesis in the skull of " Protoavis " questionable at best, and it seems most parsimonious to conclude that the specimen displays a conventional opisthostylic quadrate.
• In 1991 and 1996 " proavis " or " protoavis " models were proposed by respectively Samuel Tarsitano and Alan Feduccia, both adherents of the " thecodont " hypothesis about the origins of birds.
• The tibia of " Protoavis " allegedly possesses both a lateral and cranial cnemial crest, though the validity of this claim is subject to question due to the preservation quality of the material.