Sunday, 21 January 2018

Cretalamna bryanti: A new species of Mackeral Shark from the Late Cretaceous of Alabama.

Mackerel Sharks of the genus Cretalamna are known from Early Cretaceous to Early Eocene deposits around the world, and are thought to have been ancestral to modern species such as the Great White and Mako, as well as distinctive prehistoric species such as the giant Carcharocles megalodon. Like other fossil Sharks these species are usually only represented by their teeth, which are mineralised and grown and shed throughout their lives, rather than their skeletons, which are made of soft cartilage. Consequently differentiating these Sharks to species level is difficult, and many Late Cretaceous specimens have been assigned to a catch all species, Cretalamna appendiculata.

In a paper published in the journal PeerJ on 8 January 2018, Jun Ebersole of the McWane Science Center and Dana Ehret of the Alabama Museum of Natural History at the University of Alabama and the New Jersey State Museum, describe a new species of Cretalamna from the Late Cretaceous Tombigbee Sand of Alabama.

The new species is named Cretalamna bryanti, in honour of the Bryant family for their support of the University of Alabama, the Alabama Museum of Natural History, and the McWane Science Center. Teeth assigned to Cretalamna have been collected from the Tombigbee Sand for many years, but assigned to Cretalamna appendiculata. Ebersole and Ehret carried out a morphometric analysis, a method that relies on comparing the ratios of different measurements to one-another rather than simply assigning the samples to groups based upon their obvious shape, in order to determine that these specimens did not belong to any previously described species.

Cretalamna bryanti, anterior teeth. (A)-( E) Upper right anterior tooth in (A) oral, (B) basal, (C) mesial, (D) lingual, and (E) labial views. (F)-( J) Upper right anterior tooth in (F) lingual, (G) labial, (H) mesial, (I) oral, and (J) basal views. (K )-(O) Upper left anterior tooth, large morphology, in (K) oral, (L) basal, (M) mesial, (N) lingual, and (O) labial views. (P)-( T) Lower right anterior tooth in (P) lingual, (Q) labial, (R) mesial, (S) oral, and (T) basal views. Scale bars equal 1.0 cm. Ebersol & Ehret (2018).

See also...

http://sciencythoughts.blogspot.co.uk/2017/12/shark-remains-from-early-cretaceous-of.htmlhttp://sciencythoughts.blogspot.co.uk/2017/12/american-tourist-killed-by-shark-in.html
http://sciencythoughts.blogspot.co.uk/2017/12/californian-student-recovering-after.htmlhttp://sciencythoughts.blogspot.co.uk/2016/09/megachasma-alisonae-megamouth-shark.html
http://sciencythoughts.blogspot.co.uk/2016/01/mollisquama-sp-pocket-shark-from-gulf.htmlhttp://sciencythoughts.blogspot.co.uk/2015/11/evidence-of-shark-predation-on-whale.html
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2 comments:

  1. ASS..WR.WB.SAYA IBU RISKY TKI BRUNAY DARUSALAM INGIN BERTERIMA KASIH BANYAK KEPADA EYANG WORO MANGGOLO,YANG SUDAH MEMBANTU ORANG TUA SAYA KARNA SELAMA INI ORANG TUA SAYA SEDANG TERLILIT HUTANG YANG BANYAK,BERKAT BANTUAN EYANG SEKARAN ORANG TUA SAYA SUDAH BISA MELUNASI SEMUA HUTAN2NYA,DAN SAWAH YANG DULUNYA SEMPAT DI GADAIKAN SEKARAN ALHAMDULILLAH SUDAH BISA DI TEBUS KEMBALI,ITU SEMUA ATAS BANTUAN EYANG WORO MANGGOLO MEMBERIKAN ANGKA RITUALNYA KEPADA KAMI DAN TIDAK DI SANGKA SANGKA TERNYATA BERHASIL,BAGI ANDA YANG INGIN DIBANTU SAMA SEPERTI KAMI SILAHKAN HUBUNGI NO HP EYANG WORO MANGGOLO (0823-9177-2208) JANGAN ANDA RAGU ANGKA RITUAL EYANG WORO MANGGOLO SELALU TEPAT DAN TERBUKTI INI BUKAN REKAYASA SAYA SUDAH MEMBUKTIKAN NYA TERIMAH KASIH
    NO HP EYANG WORO MANGGOLO (0823-9177-2208) 
    BUTUH ANGKA GHOIB HASIL RTUAL EYANG WORO MANGGOLO
    DIJAMIN TIDAK MENGECEWAKAN ANDA APAPUN ANDA MINTA INSYA ALLAH PASTI DIKABULKAN BERGAUNLAH SECEPATNYA BERSAMA KAMI JANGAN SAMPAI ANDA MENYESAL 
    ANGKA TOTO MALAYSIA 4D 5D 6D KLIK DI SINI
    angka;GHOIB: singapura
    angka;GHOIB: hongkong
    angka;GHOIB; malaysia
    angka;GHOIB; toto magnum
    angka”GHOIB; laos…
    angka”GHOIB; macau
    angka”GHOIB; sidney
    angka”GHOIB: vietnam
    angka”GHOIB: korea
    angka”GHOIB: brunei
    angka”GHOIB: china
    angka”GHOIB: thailand
















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  2. ASS..WR.WB.SAYA IBU RISKY TKI BRUNAY DARUSALAM INGIN BERTERIMA KASIH BANYAK KEPADA EYANG WORO MANGGOLO,YANG SUDAH MEMBANTU ORANG TUA SAYA KARNA SELAMA INI ORANG TUA SAYA SEDANG TERLILIT HUTANG YANG BANYAK,BERKAT BANTUAN EYANG SEKARAN ORANG TUA SAYA SUDAH BISA MELUNASI SEMUA HUTAN2NYA,DAN SAWAH YANG DULUNYA SEMPAT DI GADAIKAN SEKARAN ALHAMDULILLAH SUDAH BISA DI TEBUS KEMBALI,ITU SEMUA ATAS BANTUAN EYANG WORO MANGGOLO MEMBERIKAN ANGKA RITUALNYA KEPADA KAMI DAN TIDAK DI SANGKA SANGKA TERNYATA BERHASIL,BAGI ANDA YANG INGIN DIBANTU SAMA SEPERTI KAMI SILAHKAN HUBUNGI NO HP EYANG WORO MANGGOLO (0823-9177-2208) JANGAN ANDA RAGU ANGKA RITUAL EYANG WORO MANGGOLO SELALU TEPAT DAN TERBUKTI INI BUKAN REKAYASA SAYA SUDAH MEMBUKTIKAN NYA TERIMAH KASIH
    NO HP EYANG WORO MANGGOLO (0823-9177-2208) 
    BUTUH ANGKA GHOIB HASIL RTUAL EYANG WORO MANGGOLO
    DIJAMIN TIDAK MENGECEWAKAN ANDA APAPUN ANDA MINTA INSYA ALLAH PASTI DIKABULKAN BERGAUNLAH SECEPATNYA BERSAMA KAMI JANGAN SAMPAI ANDA MENYESAL 
    ANGKA TOTO MALAYSIA 4D 5D 6D KLIK DI SINI
    angka;GHOIB: singapura
    angka;GHOIB: hongkong
    angka;GHOIB; malaysia
    angka;GHOIB; toto magnum
    angka”GHOIB; laos…
    angka”GHOIB; macau
    angka”GHOIB; sidney
    angka”GHOIB: vietnam
    angka”GHOIB: korea
    angka”GHOIB: brunei
    angka”GHOIB: china
    angka”GHOIB: thailand
















    ReplyDelete