Paleontolog
menemukan spesies baru reptil laut ‘inggris’ 200 juta tahun lalu
Date:
June 14, 2016
Source:
Taylor & Francis
Summary:
Sebuah jenis baru dari Ichthyosaurus , reptil laut yang telah punah hidup pada saat yang sama dengan dinosaurus , telah diidentifikasi oleh paleontolog dari fosil yang ditemukan di sebuah tambang tua di Nottinghamshire .
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Sebuah jenis baru dari Ichthyosaurus , reptil laut yang telah punah hidup pada saat yang sama dengan dinosaurus , telah diidentifikasi oleh paleontolog Manchester dari fosil yang ditemukan di sebuah tambang tua di Nottinghamshire .
Mirip berbentuk lumba-lumba dan hiu , ichthyosaurus - sering salah diidentifikasi sebagai ' dinosaurus berenang ' - berenang lautan bumi selama jutaan tahun selama Trias , periode Jurassic dan Cretaceous . Nottinghamshire fosil dari bagian awal Periode Jurassic - 200 juta tahun yang lalu - dan hanya segelintir spesies Ichthyosaurus dikenal dari periode ini , membuat penemuan yang sangat signifikan . Hal ini juga pertama kalinya spesies usia geologi ini telah ditemukan di luar Dorset dan Somerset .
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Palaeontologist
discovers new species of 200 million-year-old 'British' marine reptile
Date:
June 14, 2016
Source:
Taylor & Francis
Summary:
A new type of
ichthyosaur, an extinct marine reptile alive at the same time as the dinosaurs,
has been identified by a palaeontologist from a fossil found in an old quarry
in Nottinghamshire.
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A new type of ichthyosaur, an extinct
marine reptile alive at the same time as the dinosaurs, has been identified by
a Manchester palaeontologist from a fossil found in an old quarry in
Nottinghamshire.
Similar-shaped to dolphins
and sharks, ichthyosaurs -- often misidentified as 'swimming dinosaurs' -- swam
the seas of Earth for millions of years during the Triassic, Jurassic and
Cretaceous periods. The Nottinghamshire fossil is from the earliest part of the
Jurassic Period -- 200 million years ago -- and only a handful of ichthyosaur
species are known from this period, making the discovery very significant. It
is also the first time a species of this geological age has been found outside
of Dorset and Somerset.
Dean Lomax, a
Palaeontologist and Honorary Scientist at The University of Manchester,
examined the specimen after seeing it on a visit to Leicester's New Walk
Museum, which acquired the fossil in 1951, and spotted some unusual features.
The specimen is relatively complete, consisting of a partial skeleton including
a skull, pectoral bones, limbs, pelvis bones, ribs and vertebrae. However, the
bones are disorderly -- it appears that the carcass 'nosedived' into the seabed
before it became fossilised, which may have restricted previous study.
"When I first saw this
specimen, I knew it was unusual," said Dean. "It displays features in
the bones -- especially in the coracoid (part of the pectoral girdle) -- that I
had not seen before in Jurassic ichthyosaurs anywhere in the world. The
specimen had never been published, so this rather unusual individual had been
awaiting detailed examination."
Dr Mark Evans,
Palaeontologist and Curator of Natural Sciences at New Walk Museum, said:
"Parts of the skeleton had previously been on long-term loan to
ichthyosaur specialist and former museum curator Dr Robert Appleby, and had
only returned to the museum in 2004 after he sadly passed away. He was clearly
intrigued by the specimen, and although he worked on it for many years, he had
identified it as a previously known species but never published his
findings."
Dean has named the new
species Wahlisaurus massarae in honour of two palaeontologists
(Professor Judy Massare and Bill Wahl) who have contributed significantly to
the study of ichthyosaurs, and who first introduced Dean to studying them.
"Both Judy and Bill
have been tremendous mentors for me. They have significantly contributed to
palaeontology, especially the study of ichthyosaurs, and I cannot think of a
better way to remember them by naming this new ichthyosaur in their honour.
Their names will be set in stone forever, pun intended!"
The specimen is the first
new genus of ichthyosaur from the British Early Jurassic to be described since
1986. Thousands of specimens from this time are known, and many of these have
been examined -- and continue to be re-examined in light of new knowledge and
technologies. However, as the specimen is from a practically unknown location
for the discovery of ichthyosaurs, any new discovery could be of real
scientific significance. This new species is also important for our
understanding of ichthyosaur species diversity, and their geographical
distribution during the Early Jurassic.
Story Source:
The above post is reprinted
from materials provided
by Taylor & Francis. Note:
Materials may be edited for content and length.
Journal Reference:
1. Dean R. Lomax. A
new leptonectid ichthyosaur from the Lower Jurassic (Hettangian) of
Nottinghamshire, England, UK, and the taxonomic usefulness of the
ichthyosaurian coracoid. Journal of Systematic
Palaeontology, 2016; 1 DOI:10.1080/14772019.2016.1183149