Two new species of large predatory dinosaur discovered on Isle of Wight,
UK

Date:
September 29, 2021
Source:
University of Southampton
Summary:
Bones found on the Isle of Wight likely belong to two new species
of spinosaurid, a group of predatory theropod dinosaurs closely
related to the giant Spinosaurus. Their unusual, crocodile-like
skulls helped the group expand their diets, allowing them hunt
prey on both land and in the water.



FULL STORY ==========================================================================
A new study led by palaeontologists at the University of Southampton
suggests that bones found on the Isle of Wight belong to two new species
of spinosaurid, a group of predatory theropod dinosaurs closely related
to the giant Spinosaurus. Their unusual, crocodile-like skulls helped
the group expand their diets, allowing them hunt prey on both land and
in the water.


==========================================================================
The haul of bones was discovered on the beach near Brighstone over a
period of several years. Keen-eyed fossil collectors initially found
parts of two skulls, and a crew from Dinosaur Isle Museum recovered a
large portion of a tail. In all, over 50 bones from the site have been uncovered from rocks that form part of the Wessex Formation, laid down
over 125 million years ago during the Early Cretaceous.

The only spinosaurid skeleton previously unearthed in the UK belonged
to Baryonyx,which was initially discovered in 1983 in a quarry in
Surrey. Most other finds since have been restricted to isolated teeth
and single bones.

Analysis of the bones carried out at the University of Southampton and published in Scientific Reports suggested they belonged to species of
dinosaurs previously unknown to science.

Chris Barker, a PhD student at the University of Southampton and lead
author of the study, said: "We found the skulls to differ not only
from Baryonyx, but also one another, suggesting the UK housed a greater diversity of spinosaurids than previously thought." The discovery of spinosaurid dinosaurs on the Isle of Wight was a long time coming. "We've
known for a couple of decades now that Baryonyx-like dinosaurs awaited discovered on the Isle of Wight, but finding the remains of two such
animals in close succession was a huge surprise" remarked co-author
Darren Naish, expert in British theropod dinosaurs.



==========================================================================
The first specimen has been named Ceratosuchops inferodios, which
translates as the "horned crocodile-faced hell heron." With a series
of low horns and bumps ornamenting the brow region the name also refers
to the predator's likely hunting style, which would be similar to that
of a (terrifying) heron. Herons famously catch aquatic prey around
the margins of waterways but their diet is far more flexible than is
generally appreciated, and can include terrestrial prey too.

The second was named Riparovenator milnerae. This translates as "Milner's riverbank hunter," in honour of esteemed British palaeontologist Angela
Milner, who recently passed away. Dr Milner had previously studied
and named Baryonyx - - a major palaeontological event whose discovery substantially improved our understanding of these distinctive predators.

Dr David Hone, co-author from Queen Mary University of London: "It
might sound odd to have two similar and closely related carnivores in
an ecosystem, but this is actually very common for both dinosaurs and
numerous living ecosystems." Although the skeletons are incomplete, the researchers estimate that both Ceratosuchops and Riparovenator measured
around nine metres in length, snapping up prey with their metre-long
skulls. The study also suggested how spinosaurids might have first
evolved in Europe, before dispersing into Asia, Africa and South America.

Dr Neil J. Gostling of the University of Southampton, who supervised the project, said: "This work has brought together universities, Dinosaur Isle museum and the public to reveal these amazing dinosaurs and the incredibly diverse ecology of the south coast of England 125 million years ago."
The Early Cretaceous rocks on the Isle of Wight describe an ancient
floodplain environment bathed in a Mediterranean-like climate. Whilst
generally balmy, forest fires occasionally ravaged the landscape, and
the remains of burnt wood can be seen throughout the cliffs today. With
a large river and other bodies of water attracting dinosaurs and housing various fish, sharks and crocodiles, the habitat provided the newly
discovered spinosaurids with plenty of hunting opportunities.



========================================================================== Fossil collector Brian Foster from Yorkshire, who made an important contribution to the finds and publication, said: "This is the
rarest and most exciting find I've made in over 30 years of fossil
collecting." Fellow collector Jeremy Lockwood, who lives on the Isle
of Wight and discovered several bones added, "we realised after the two
snouts were found that this would be something rare and unusual. Then it
just got more and more amazing as several collectors found and donated
other parts of this enormous jigsaw to the museum." Dr Martin Munt,
Curator of Dinosaur Isle Museum, noted how these new finds cement the
Isle of Wight's status as one of the top locations for dinosaur remains
in Europe. The project also solidified how collectors, museums and
universities can work together to bring fossil specimens to light.

Dr Munt added: "On behalf of the museum I wish to express our gratitude to
the collectors, including colleagues at the museum, who have made these
amazing finds, and made them available for scientific research. We also congratulate the team who have worked on these exciting finds and brought
them to publication." Video illustrating newly discovered dinosaurs: https://www.youtube.com/ watch?v=x3gUECD7axs&t=7s The new fossils will
go on display at Dinosaur Isle Museum at Sandown.

========================================================================== Story Source: Materials provided by University_of_Southampton. Note:
Content may be edited for style and length.


========================================================================== Journal Reference:
1. Chris T. Barker, David W. E. Hone, Darren Naish, Andrea Cau,
Jeremy A. F.

Lockwood, Brian Foster, Claire E. Clarkin, Philipp Schneider,
Neil J.

Gostling. New spinosaurids from the Wessex Formation
(Early Cretaceous, UK) and the European origins of
Spinosauridae. Scientific Reports, 2021; 11 (1) DOI:
10.1038/s41598-021-97870-8 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2021/09/210929080303.htm

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