Eberth and also Evans’s Hadrosaurs, a Book Review, Part 2

Several of the book’s payments on palaeobiology are particularly intriguing. W. Scott Persons as well as Philip Currie check out the function of the caudofemoralis in hadrosaurs as well as what it could imply for running and escape behaviour.

Running, swimming, chewing.

They suggest that hadrosaur morphology might not allow higher sprint speeds than those of their main predators (tyrannosaurids), yet that greater endurance is recommended by the positions of the muscular tissue insertions.

Henderson’s digital modelling of a floating Centrosaurus indicates that ceratopsids were likely not great swimmers. Debt: Henderson 2014, in Eberth & & Evans 2014

Donald Henderson’s ‘Duck soup: the drifting fates of hadrosaurs and ceratopsians at Dinosaur Provincial Park’ describes his use of digital modelling in determining the possible floating poses of both hadrosaurs as well as ceratopsians. Hadrosaurs might well have been qualified swimmers, easily capable of maintaining the head free from the water, but the very same can not be said for ceratopsids.

If Don’s versions are right, the latter would certainly appear absolutely maladapted for swimming or floating as well as pre-disposed for sinking. This could be the final nail in the casket for Lehman’s proposition that some ceratopsids (like Agujaceratops) lived amphibious, hippo-like lives (Lehman 2007), a sight inconsistent with various other lines of evidence anyhow.

I haven’t discussed the very fine art piece– by Danielle Dufault– that shows up on the back cover. This is a cropped section of the whole point. Both Parasaurolophus individuals portrayed here are acting like a male as well as female of the same types… … however they in fact represent two distinct varieties that were divided precede and time. Credit report: Eberth & & Evans 2014

Ali Nabavizadeh talks about hadrosaur jaw feature,

his version involving a palinal jaw motion (this definition that the lower jaw is pulled in reverse relative to the rest of the skull) and also medial turning of the dentaries. That latter suggestion has variously remained in and also obsolescent over the decades; its visibility is certainly called for considered that the pleurokinetic version (including side turning of the maxilla) is now basically disproven (e.g., Holliday & & Witmer 2008, Cuthbertson et alia. 2012).

Taphonomy: bonebeds and also soft cells.

In the last area of the book, James Schmitt et alia. discuss an assemblage where debris arising from a debris flow occasion entombs hadrosaur bones. This appears like a case where unfortunate hadrosaurs passed away in catastrophic style linked to a volcanic eruption … however, no. Other mass death assemblages are explained in studies on the Dinosaur Park Formation and also Zhucheng in Shandong Province, China.

Hadrosaur fossils coming from a number of various family trees have big quantities of skin maintained, as revealed here in Phil Bell’s layout, from Bell (2014 ). Debt &: Bell 2014

, in Eberth & Evans 2014 A review of hadrosaur pathologies is given by Darren Tanke and also Bruce Rothschild. The quantity ends with a truly useful summary of our understanding on hadrosaur skin impacts by Phil Bell, a chapter on soft tissue nasal frameworks in a mummified Edmontosaurus sampling by Albert Prieto-Márquez and Jonathan Wagner, and another by Phillip Manning et alia. on the biochemistry and biology of maintained hadrosaur skin. That preserved ‘skin’ on the mommies really is real skin (rather than plain impressions of it), and it seems to also preserve the chemical traces associated with pigments.

Those of us curious about and associated with scientific research value ‘good science’. But a guilty enjoyment that a minimum of several of us admit to is that we also rather delight in taking a look at bad documents: those that utilize spurious or very suspicious argumentation, propose an unusual, ‘non-standard’ design that doesn’t fit the bulk of evidence, or are simply nuts. And yet … Hadrosaurs does not include any type of such short article, as well as I leave it to you to determine whether this is an advantage or a poor thing.

Cover of Eberth & & Evans (2014 ). A Djadokhta Formation scene, featuring Plesiohadros, gets on the cover; art by Julius Csotonyi. Credit Score: Indiana University Press

I am, overall, pleased with Hadrosaurs. Well designed, good-looking as well as exceptionally well edited (credit rating there to Patricia Ralrick), congratulations are deserved to the editors for pulling together a vast amount of content, and also doing it well. Guide consists of a big amount of info on these dinosaurs as well as reflects the state of play as of 2014-ish: many of the conversations on phylogeny, new taxa, makeup, practical morphology, biogeography, taphonomy as well as more will require to be sought advice from and mentioned by experts.

Guide is absolutely not, nevertheless, a testimonial of hadrosaur diversity and biology overall (not that it was meant to be), and also its price in hardcopy is high, so it’s not meant for non-specialists. The unpreventable question, after that, is: when will an excellent, non-technical testimonial quantity– something on par with Dodson’s The Horned Dinosaurs (Dodson 1996) or Hallett and Wedel’s The Sauropod Dinosaurs (Hallett & & Wedel 2016)– show up on this team?

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