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Are Mosasaurs considered lizards?

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aplomado

Are Mosasaurs considered lizards?

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PFOOLEY

I would say no...they share the same order but are from different clades/suborders.

 

image.png.90806e48a046ffca8dcd92c236068e05.png

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WhodamanHD

They are usually considered squamates but placement is highly debated and new emerging evidence shows a more distant relationship, while some point to other (mainly morphological) evidence to show closer relationships (more towards snakes really) . In other words, not lizards, possibly closely related but check in a few years and this may change.

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PFOOLEY

A few more tidbits on this very interesting subject :) ...

 

reptile_cladogram.thumb.PNG.2579e4d157e9bc046964934dc880b451.PNG

 

...from Integrated Analyses Resolve Conflicts over Squamate Reptile Phylogeny and Reveal Unexpected Placements for Fossil Taxa...

 

...and a living reptile cladogram...

 

59a06266ab1f1_livingreptilecladogram.jpg.110b79fcfcd9e2994ca02384575ca1c5.jpg

 

...from Natural History Magazine.

 

Gotta love Herpetology! :D

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Macrophyseter

I was about to say technically no, but actually they could be lizards. Most people just recognize mosasaurs up to as a squamate, which also includes snakes, so that isnt enough to classify it as a lizard. But mosas are actually also in the clade Platynota which IS composed of only lizards if im correct, so i guess mosasaurs can be defined as true lizards.

 

But as far as I know, Platynota used to be used to also define snakes but the snakes were moved to their own clades. I might be wrong, so dont take my word too seriously.

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doushantuo

caldj.1096-3642_1999.tb00587.x.pdf

Might also be in Fruitbat's Library ,haven't checked

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doushantuo

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doushantuo

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doushantuo

ALBLA

(NB:large file,54.6 Mb)

afriteethselacleachfavohh56ghb.jpg

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doushantuo

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doushantuo

thesjimhui

About 8,5 Mb

Although what follows suggests otherwise,the brunt of the thesis consists of cladograms and character matrices

amimages.jpg

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LordTrilobite
On 25/08/2017 at 7:49 PM, PFOOLEY said:

A few more tidbits on this very interesting subject :) ...

 

reptile_cladogram.thumb.PNG.2579e4d157e9bc046964934dc880b451.PNG

 

Since this clearly shows that either Lizards are monophyletic and snakes are mosasaurs are also subsets of lizards. Or Lizards are paraphyletic and it doesn't have a clear definition anyway and you could just as easily include mosasaurs anyway.

 

So yes. I would say that Mosasaurs are definitely just overgrown marine lizards.

 

I think it's just easier to just say that Squamata = Lizards. So I would consider Mosasaurs a subset of lizards. Otherwise it just devolves into arbitrary nonsense of saying this belongs in this group and that one doesn't. If one considers legless lizards to be actual lizards, I don't think it makes sense to say that Mosasaurs aren't actually lizards. Aquatic snakes are also still called snakes even though they have flattened tails that are basically tail fins.

 

It's also easier to explain to people who think mosasaurs are dinosaurs. Just saying they are big water lizards is nice and clear to understand for people who aren't very well versed in taxonomy.

 

 

So yea, large lizards with paddles and fins imo.

 

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Macrophyseter

Seeing this, I've just thought, you know those people who think that lizard aliens took over the world? Well I guess they were partially right, actual lizards did once take over the aquatic world.

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ynot
4 minutes ago, Macrophyseter said:

mosasaurs are the only dominant mesozoic marine reptile to not be closely related to dinosaurs

What about Ichthyosaurs and plesiosaurs.

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Macrophyseter

Wait, scratch that. I completely forgot that ichthyosaurs arnt archosauromorphs :wacko:. So I guess mosasaurs and ichthyosaurs, unless you dont count archosauromorpha being close enough. Sorry for any possible misleading :wacko:

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