Max-fossils Posted July 25, 2017 Share Posted July 25, 2017 Just now, Foozil said: Awesome finds, congrats! Thanks! Yours are cooler though Plus they're in a museum now, which is even cooler! Max Derème "I feel an echo of the lightning each time I find a fossil. [...] That is why I am a hunter: to feel that bolt of lightning every day." - Mary Anning >< Remarkable Creatures, Tracy Chevalier Instagram: @world_of_fossils Link to comment Share on other sites More sharing options...
Ptychodus04 Posted July 25, 2017 Share Posted July 25, 2017 (edited) 3 hours ago, Ludwigia said: PPS. I just did a quick bit of research and discovered that by the heteromorphs the size doesn't necessarily differ all that much but that the main difference is the thickness of the body chamber. Just learned something new. Roger, my understanding of heteromorph sexual dimorphism is gracile vs robust rather than extreme difference in size (which thankfully agrees with your statement above). Edited July 25, 2017 by Ptychodus04 Autocorrect strikes again. Regards, Kris Global Paleo Services, LLC https://globalpaleoservices.com http://instagram.com/globalpaleoservices http://instagram.com/kris.howe Link to comment Share on other sites More sharing options...
doushantuo Posted July 25, 2017 Share Posted July 25, 2017 https://pubs.usgs.gov/pp/0619/report.pdf Scaphitids and it does(maybe only marginally) touch on the subject of dimorphism Taxonomy:might be outdated(i think i posted some Landman(on scaphitids), a while back Tajika et al have noted(PeerJ,sept. 2015) : "The results of a series of statistical tests (Table 5; analyses of the residual sum of squares) suggest that the males tend to produce more chambers than females with nearly the same conch diameter." Link to comment Share on other sites More sharing options...
Ludwigia Posted July 25, 2017 Share Posted July 25, 2017 9 hours ago, Ptychodus04 said: Roger, my understanding of heteromorph sexual dimorphism is gracile vs robust rather than extreme difference in size (which thankfully agrees with your statement above). It threw me off at first since I'm used to the great difference in size with the Jurassic ammonites. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Ptychodus04 Posted July 25, 2017 Share Posted July 25, 2017 1 hour ago, Ludwigia said: It thew me off at first since I'm used to the great difference in size with the Jurassic ammonites. The Cretaceous was all about gender equality. Regards, Kris Global Paleo Services, LLC https://globalpaleoservices.com http://instagram.com/globalpaleoservices http://instagram.com/kris.howe Link to comment Share on other sites More sharing options...
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