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Rahonavis70m — Shark Week - Cretalamna appendiculata
#cretalamna #cretolamna #mackerelshark #cretolamnaappendiculata #cretalamnaappendiculata #sharkweek2018
Published: 2018-07-27 22:06:41 +0000 UTC; Views: 1810; Favourites: 40; Downloads: 0
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Description
Fifth day of Shark Week, and from here on, I have several mackerel sharks to showcase. Several species of the otodontid Cretalamna are known from the phosphates, amongst them the 2 metre long species Cretalamna appendiculata. This particular species is known throughout Africa, Europe and North America, and can be found from the Cenomanian of the Cretaceous to the Miocene. I have only been focusing on the Palaeocene sample from the phosphates that I studied, but I also had a sample of material from the Maastrichtian beds. Cretalamna appendiculata is the only species that I found in both samples, although other species I identified are also known to have survived the K/Pg extinction. It became less common during the Cenozoic, but my Palaeocene contained approx. 300 teeth compared with 5 Maastrichtian teeth, probably due to sampling bias.This one was definitely the hardest shark to draw yet, despite being the only one I’ve drawn before. More from the otodontids later
Happy Shark Week!Day Four here: www.deviantart.com/rahonavis70…
Day Six here: www.deviantart.com/rahonavis70…
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Comments: 14
Why do shark genera and species have the tendency to survive for so long?
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Perhaps they just get lucky. Or maybe they have exactly what they need to survive anything nature throws at them (for a certain amount of time).
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Yeah.
Even C. megalodon, one of the largest raptorial predators in earth history and not really what you’d expect to be adaptable, lasted over 15 million years as a single species. I can’t think of any other apex predator that lasts that long.
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If there is one, it’s probably another shark.
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Yeah lol.
Though the track record has to go to Hybodus which even survived the Great Dying.
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Oh yeah, nothing can beat Hybodus, surviving two mass extinctions in a row.
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Shame it didn't survive the K-T event too.
But seriously; the fucking thing survived the Great Dying and couldn't survive a less severe mass extinction? That said, hybodontids just barely made it to the Miocene with Miosynechodus (!!!)
They made it from the Paleozoic to the Cenozoic....
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Tbf it didn’t even get that close to the K/Pg.
Yeah, hybodonts we’re so close to making it to modern times.
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AH, My favourite Shark next to Hybodus and Xenacanthus! Great Work with it!
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Thanks! I’m glad you like it!
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Just so you know, the original and correct spelling is Cretalamna and not Cretolamna
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Thanks, weird how both synonyms are still in use
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It's an interesting story. Russian paleontologist Leonid Glickman originally named the genus as Cretalamna in a paper in 1958 (Glickman, 1958 ). However, in all subsequent publications he used the misspelling Cretolamna; in Popov (2016) it is noted that Glickman often made such spelling mistakes when it came to binomials. Thus the spelling Cretolamna was used by researchers until Siverson (1999) reinstated the correct spelling, and nowadays Cretalamna is used instead in most papers.
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