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Re: [dinosaur] How many end-Cretaceous dinosaur genera were there

Moreover, many of those species are likely synonyms or nomina dubina. Titanosaur-biased as I am, the example that sticks out to me is that Balochisaurus malkani, Jainosaurus septentrionalis, Khetranisaurus barkhani, Marisaurus jeffi, Pakisaurus balochistani, Sulaimanisaurus gingerichi, Titanosaurus indicus, Titanosaurus blanfordi, and Isisaurus colberti (not listed for whatever reason) all come from the Maastrichtian of the Indian subcontinent which may have as few as two species, the rest based on non-overlapping or dubious material.

On Sun, Dec 4, 2016 at 8:57 AM Thomas Richard Holtz <tholtz@umd.edu> wrote:
Many of these are from the early Maastrichtian, and so are not known from the terminal Cretaceous.

On Sun, Dec 4, 2016 at 9:47 AM, <john-schneiderman@cox.net> wrote:
Lst of known named Dinosaurs 98 genera=282 species, my best guess based on age range

1.†Ankylosaurus magniventris
1.†Anodontosaurus lambei
1.†Brachypodosaurus gravis
1.†Denversaurus schlessmani
1.†Edmontonia longiceps
2.†Edmontonia schlessmani
1.†Glyptodontopelta mimus
1.†Struthiosaurus austriacus
2.†Struthiosaurus languedocensis
3.†Struthiosaurus transylvanicus
1. †Agathaumas sylvestris
1. †Eotriceratops xerinsularis
1. †Leptoceratops gracilis
1. †Nedoceratops hatcheri
1. †Ojoceratops fowleri
1. †Pachyrhinosaurus canadensis
2. †Pachyrhinosaurus lakustai
3. †Pachyrhinosaurus perotorum
1. †Polyonax mortuarinus
1. †Protoceratops andrewsi
2. †Protoceratops hellenikorhinus
1. Regaliceratops peterhewsi
1. †Sinoceratops zhuchengensis
1. †Tatankaceratops sacrisonorum
1. †Torosaurus latus
2. †Torosaurus utahensis
1. †Triceratops horridus
2. †Triceratops prorsus
1. †Amurosaurus riabinini
1. †Arenysaurus ardevoli
1. †Augustynolophus morrisi
1. †Blasisaurus canudoi
1. Canardia garonnensis
1. †Charonosaurus jiayinensis
1. †Edmontosaurus regalis
2. †Edmontosaurus annectens
1. †Hypacrosaurus altispinus
1. †Kerberosaurus manakini
1. †Koutalisaurus kohlerorum
1. †Kundurosaurus nagornyi
1. †Mandschurosaurus amurensis
2. †Mandschurosaurus laosensis
1. †Microhadrosaurus nanshiungensis
1. †Morrosaurus antarcticus
1. †Nanningosaurus dashiensis
1. †Olorotitan arhanensis
1. †Orthomerus dolloi
1. †Pararhabdodon isonensis
1. †Parksosaurus warreni
1. †Rhabdodon priscus
2. †Rhabdodon septimanicus
1. †Sahaliyania elunchunorum
1. †Saurolophus angustirostris
2. †Saurolophus osborni
1. †Secernosaurus koerneri
1. †Telmatosaurus transsylvanicus
1. †Thescelosaurus garbanii
2. †Thescelosaurus neglectus
3. †Thescelosaurus assiniboiensis
1. †Thespesius occidentalis
1. †Wulagasaurus dongi
1. †Zalmoxes robustus
2. †Zalmoxes shqiperorum
1. †Dracorex hogwartsia
1. †Goyocephale lattimorei
1. †Pachycephalosaurus wyomingensis
1. †Prenocephale prenes
1. †Sphaerotholus bucholtzae
2. †Sphaerotholus edmontonensis
1. †Stygimoloch spinifer
1. †Acheroraptor temertyorum
1. †Anzu wyliei
1. †Banji long
1. †Betasuchus bredai
1. †Coeluroides
1. †Compsosuchus solus
1. †Dakotaraptor steini
1. †Dryptosauroides grandis
1. †Dryptosaurus aquilunguis
1. †Heptasteornis andrewsi
1. †Indosuchus raptorius
1. †Jiangxisaurus ganzhouensis
1. †Luanchuanraptor henanensis
1. †Leptorhynchos elegans
2. †Leptorhynchos gaddisi
1. †Majungasaurus crenatissimus
1. †Mononykus olecranus
1. †Nanotyrannus lancensis
1. †Ornithomimoides barasimlensis
2. †Ornithomimoides mobilis
1. †Ornithomimus edmontonicus
2. †Ornithomimus velox
1. †Orthogoniosaurus matleyi
1. †Paronychodon caperatus
1. †Pectinodon bakkeri
1. †Qianzhousaurus sinensis
1. †Qiupalong henanensis
1. †Rahiolisaurus gujaratensis
1. †Richardoestesia isosceles
1. †Struthiomimus altus
2. †Struthiomimus sedens
1. †Tarbosaurus bataar
1. †Therizinosaurus cheloniformis
1. †Troodon formosus
1. †Tyrannosaurus rex
1. †Velociraptor mongoliensis
1. †Yulong mini
1.†Alamosaurus sanjuanensis
1.†Ampelosaurus atacis
1.†Arkharavia heterocoelica
1.†Balochisaurus malkani
1.†Bonatitan reigi
1.†Dreadnoughtus schrani
1.†Hypselosaurus priscus
1.†Jainosaurus septentrionalis
1.†Khetranisaurus barkhani
1.†Magyarosaurus dacus
1.†Marisaurus jeffi
1.†Pakisaurus balochistani
1.†Paludititan nalatzensis
1.†Rapetosaurus krausei
1.†Saltasaurus loricatus
1.†Sulaimanisaurus gingerichi
1.†Titanosaurus indicus
1.†Titanosaurus blandfordi
1.†Uberabatitan ribeiroi
1.†Vahiny depereti
1.†Anatalavis rex
1.†Avisaurus archibaldi
2.†Avisaurus gloriae
1.†Brodavis americanus
2.†Brodavis baileyi
3.†Brodavis mongoliensis
1.†Canadaga arctica
1.†Ceramornis major
1.†Cimolopteryx maxima
2.†Cimolopteryx minima
3.†Cimolopteryx rara
4.†Cimolopteryx petra
1.†Gurilynia nessovi
1.†Hesperornis regalis
2.†Hesperornis crassipes
3.†Hesperornis gracilis
4.†Hesperornis altus
5.†Hesperornis montana
6.†Hesperornis rossicus
7.†Hesperornis bairdi
8.†Hesperornis chowi
9.†Hesperornis macdonaldi
10.†Hesperornis mengeli
1.†Laornis edvardsianus
1.†Lectavis bretincola
1.†Neogaeornis wetzeli
1.†Palintropus retusus
1.†Polarornis gregorii
1.†Potamornis skutchi
1.†Tytthostonyx glauconiticus
1.†Vegavis iaai
1.†Yungavolucris brevipedalis

---- Gregory Paul <gsp1954@aol.com> wrote:
> Using Walker's Mammals of the World I have done a rough count of mammals in the dinosize range of a quarter kilogram on up and got around 1000 species, excluding those from tundra polar habitats that were not around back then. On the other hand the megafauna killed off by humans in the last 50K years were not included. And maybe those mammals under a kg should be dropped because the non avian dinosaurs under that level were preavian theropods. And today the range of habitats is greater than back then, more mountain highlands, grasslands, etc. So it is probable that at a given time the non avian dinosaur species numbered in the mid or high hundreds, and the 600-1000 estimate is plausible, but maybe a little high. It is very unlikely that bird diversity was anywhere close to modern levels in those primitive times, probably in the hundreds or low thousands.
> It's the Starrfelt & Liow estimate (Philos Transactions 2016) that just 2000! non avian dinosaur SPECIES that were extant in the ENTIRE Mesozoic that is bogus. How did that get past review? Was more like tens of thousands of species. Might do a short paper on that.
> GSPaul
> -----Original Message-----
> From: Ruben Safir <ruben@mrbrklyn.com>
> To: dinosaur-l <dinosaur-l@mymaillists.usc.edu>
> Sent: Sun, Dec 4, 2016 12:40 am
> Subject: Re: [dinosaur] How many end-Cretaceous dinosaur genera were there
> On 12/04/2016 12:14 AM, Ruben Safir wrote:
> > On 12/03/2016 10:53 PM, Mike Habib wrote:
> >> There are about 11,000 species of named living bird species, but I wouldn't use that as a gauge for the likely number of non-avian dinosaurs at any time interval. Species density within clades is always highly uneven.
> >>
> >
> > Mike, think about it.  The earth was richer then.  How many mammals are
> > there now?
> >
> According to Mammal Species of the World, 5,416 species were known in
> 2006. These were grouped in 1,229 genera, 153 families and 29 orders
> from wikipedia...
> and I bet that is a severe underestimate of the number of mammal species
> alive today.
> I have no idea how they get 628 to 1076 but if it is based on the
> thought that we have anything near a complete image of the fauna from 70
> million years ago (after a comet smashed a huge hole into the earths
> crust the size of the midwest), then I think you need to reconsider.
> and who said birds weren't to count as dinosaurs.  think about how many
> species were discovered just since you have entered the field.  And you
> have lost whole continents.
> >
> >> --Mike
> >>
> >> Sent from my Cybernetic Symbiote
> >>
> >>> On Dec 3, 2016, at 7:18 PM, Ruben Safir <ruben@mrbrklyn.com> wrote:
> >>>
> >>>> On 12/03/2016 10:12 PM, john-schneiderman@cox.net wrote:
> >>>> I am not aware of any current world-wide census of terminal late Cretaceous Dinosaur genus/species. But there is an estimate of between 628 and 1076 dinosaur species existed prior to the K-Pg event. I'm referencing the study by Jean Le Loeuff
> >>>
> >>>
> >>> Does that make sense?  How many bird species are there today?
> >>>
> --
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Thomas R. Holtz, Jr.
Email: tholtz@umd.edu         Phone: 301-405-4084
Principal Lecturer, Vertebrate Paleontology

Office: Geology 4106, 8000 Regents Dr., College Park MD 20742

Dept. of Geology, University of Maryland

Phone: 301-405-6965
Fax: 301-314-9661              

Faculty Director, Science & Global Change Program, College Park Scholars

Office: Centreville 1216, 4243 Valley Dr., College Park MD 20742
Fax: 301-314-9843

Mailing Address:        Thomas R. Holtz, Jr.
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