tag:blogger.com,1999:blog-3248412803814730250.post5453136519737725904..comments2024-03-17T01:48:59.504-07:00Comments on The Theropod Database Blog: Haplocheirus the Jurassic alvarezsaur is comingMickey Mortimerhttp://www.blogger.com/profile/08831823442911513851noreply@blogger.comBlogger9125tag:blogger.com,1999:blog-3248412803814730250.post-79466753543223329442010-02-03T02:53:49.419-08:002010-02-03T02:53:49.419-08:00Sereno defined Maniraptora as a stem based clade u...<i>Sereno defined Maniraptora as a stem based clade using Passer as an internal specifier and Ornithomimus as an external specifier</i><br /><br />Doesn't that go straight back to Gauthier (1986)?David Marjanovićnoreply@blogger.comtag:blogger.com,1999:blog-3248412803814730250.post-25356939860875679112010-01-31T06:33:33.270-08:002010-01-31T06:33:33.270-08:00Yes Mike, that's what i meant in my post. Than...Yes Mike, that's what i meant in my post. Thanks for clarifying.Jayhttps://www.blogger.com/profile/00505674810360625955noreply@blogger.comtag:blogger.com,1999:blog-3248412803814730250.post-91372704872114457712010-01-31T04:15:32.991-08:002010-01-31T04:15:32.991-08:00I agree with all your comments and strongly disagr...I agree with all your comments and strongly disagree with the new definition of Maniraptora. In my analyses, Ornithomimosauria results closer to birds than Ornitholestes is, and thus is a maniraptoran clade (sensu Choiniere et al, 2010), contrasting with the original meaning of "Maniraptora" as "all theropods closer to birds than ornithomimids".Andrea Cauhttps://www.blogger.com/profile/10855060597677361866noreply@blogger.comtag:blogger.com,1999:blog-3248412803814730250.post-61178295420277416592010-01-30T15:57:54.664-08:002010-01-30T15:57:54.664-08:00A "stem group" is a total clade minus th...A "stem group" is a total clade minus the corresponding crown clade, e.g., "stem-mammals" = Synapsida - Mammalia. What you're referring to is a "branch-based clade" (originally called a "stem-based clade" -- the name was changed to bring it into line with other terminology and remove confusion with the older term "stem group".<br /><br />Your points about that being a bad definition stand.Mike Keeseyhttps://www.blogger.com/profile/00147156174467903264noreply@blogger.comtag:blogger.com,1999:blog-3248412803814730250.post-70069428750838490612010-01-29T04:07:18.113-08:002010-01-29T04:07:18.113-08:00In addition, the authors choose to redefine Alvare...In addition, the authors choose to redefine Alvarezsauroidea more inclusively as a stem group: "..most inclusive clade sharing a more recent common ancestor with Alvarezsaurus calvoi than with Passer domesticus." But this definition could become problematic.<br /><br />The current phylogenetic hypothesis isn't robustly supported, as Mickey's noted, and if ornithomimosaurs (or any other coelurosaurian clade) are subsequently hypothesised to be a sister group to alvarezsaurs, then they will also become Alvarezsauroidea.Jayhttps://www.blogger.com/profile/00505674810360625955noreply@blogger.comtag:blogger.com,1999:blog-3248412803814730250.post-2781714282379342652010-01-28T17:15:01.264-08:002010-01-28T17:15:01.264-08:00Although, on a positive note, can I just say how n...Although, on a positive note, can I just say how nice it is to see a well-formed, meaningful new genus name?<br /><br />Oh, and the actual animal and its transitional status and its stratigraphic significance are all awesome, too.Mike Keeseyhttps://www.blogger.com/profile/00147156174467903264noreply@blogger.comtag:blogger.com,1999:blog-3248412803814730250.post-55235629838982293762010-01-28T14:54:21.606-08:002010-01-28T14:54:21.606-08:00Ornitholestes and Archaeopteryx are horrible ancho...Ornitholestes and Archaeopteryx are horrible anchors, too.Mike Keeseyhttps://www.blogger.com/profile/00147156174467903264noreply@blogger.comtag:blogger.com,1999:blog-3248412803814730250.post-88915453399313122352010-01-28T14:48:24.781-08:002010-01-28T14:48:24.781-08:00I agree that the new definition was completely unn...I agree that the new definition was completely unnecessary since if they had followed Sereno (2005), they would have still had maniraptoran alvarezsaurs given that Sereno defined Maniraptora as a stem based clade using Passer as an internal specifier and Ornithomimus as an external specifier. There was no need for coining a new node-based definition.<br /><br />Deleted previous post and re-posted.Nickhttps://www.blogger.com/profile/08718847558790015112noreply@blogger.comtag:blogger.com,1999:blog-3248412803814730250.post-22832135645701261852010-01-28T14:47:14.717-08:002010-01-28T14:47:14.717-08:00This comment has been removed by the author.Nickhttps://www.blogger.com/profile/08718847558790015112noreply@blogger.com