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Showing content with the highest reputation since 06/10/2020 in all areas

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    I was inspired to sketch this up after watching AronRa interview Robert Schneiker on his analysis of the Sphinx and Gobekli Tepe. One viewer asked the question on whether there were fossils in the Sphinx. This is my rendition of a nummulite which i believe is the kind of fossil they were talking about. I used a photo on wikipedia as reference "Nummulite, Life and Rocks 1894. R A Lydekker"
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    An update on the classification of catsharks. A new paper by Soares, Marcelo and de Carvalho has just been published examining the phylogeny of the 16 species in the genus Scyliorhinus. The paper looked at 84 morphological characters on specimens of the 16 Scyliorhinus species, 4 of the 18 Cephaloscyllium species, the 2 species of Poroderma, specimens of almost all the other scyliorhinid genera and 1 specimen of proscyliid (to use as the root of the cladogram). A strict consensus cladogram supported that the genera Scyliorhinus, Cephaloscyllium and Poroderma compose a monophyletic clade: Scyliorhininae. This brings a few changes to the 3 previously made classifications I had entered in the Phylogeny Explorer's tree. This new paper seems to instead support a similar yet slightly different classification of the three major scyliorhinid clades: Scyliorhinidae I: Apristurus, Asymbolus, Bythaelurus, Cephalurus, Figaro, Halaelurus, Haploblepharus, Holohalaelurus, Parmaturus, Schroederichthys Scyliorhinidae II: Atelomycterus, Aulohalaerus Scyliorhininae: Cephaloscyllium, Poroderma, Scyliorhinus Nothing is written on stone however, and this classification will likely further change in the future with new research. Additionally, this paper doesn't address the classification of Pseudotriakidae, Gogolia filewoodi and Pentachus profundicolus, which the Chondrichthyan Tree of Life (https://sharksrays.org/) built by Dr Gavin Naylor has nestled in between these three major Scyliorhinid clades, while also making Scyliorhinidae a paraphyletic clade. Considering this is by far the most diverse group of extant selachimorphs (sharks), keeping track of these phylogenetics papers is important to ensure the accuracy of our tree. Soares,_Marcelo_&_de_Carvalho_(2020)_Phylogenetic_Relationship_of_Catshark_Species_of_the_Genus_Scyliorhinus.pdf
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