[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
New papers--New exhibit in London
From: Ben Creisler firstname.lastname@example.org
New papers--New exhibit in London
Some new Mesozoic vertebrate items of note:
Cruickshank A.R.I. & Fordyce R.E. 2002. A New Marine
Reptile (Sauropterygia) from New Zealand: Further Evidence
for A Late Cretaceous Austral Radiation of Cryptoclidid
Plesiosaurs. Palaeontology 45 (3):557-575
Abstract: Kaiwhekea katiki gen. et sp. nov. represents the
first described cryptoclidid plesiosaurian from New
Zealand. It is one of the largest cryptoclidids known, at
a length of over 6.5 m, and represents the third reported
genus of austral Late Cretaceous cryptoclidids. Kaiwhekea
katiki is from siltstones of the Katiki Formation, upper
Haumurian Stage (Cenomanian-Maastrichtian; c. 69-70 Ma) of
coastal Otago, South Island, New Zealand. In the Late
Cretaceous, the locality lay close to the polar circle.
The holotype and only known specimen is an articulated
skeleton with skull, preserved mostly as natural molds,
but which lacks the forelimbs and pectoral girdle. The
skull is relatively large and possesses several distinct
characters, including a substantial, deep, jugal. There
are about 43 upper and 42 lower teeth in each jaw
quadrant; all are homodont, slim, and slightly recurved,
lacking prominent ornament. Kaiwhekea probably took single
soft-bodied prey. Based on cranial structure, it clearly
belongs with the Cryptoclididae, but is not certainly
close to the southern Late Cretaceous cryptoclidids
Morturneria (Seymour Island, Antarctica) and Aristonectes
Naish, D. 2002. The historical taxonomy of the Lower
Cretaceous theropods (Dinosauria) Calamospondylus and
Aristosuchus from the Isle of Wight. Proceedings of the
Geologists' Association 113(2):153-163.
Abstract: The historical taxonomy of the small theropod
dinosaurs from the Wealden Group (Lower Cretaceous) of
England is confused and complex. Of the twelve species
names, several are synonymous and the remainder are mostly
nomina dubia. Among the latter are the probable bird
Wyleyia valdensis, the probable oviraptorosaur
Thecocoelurus daviesi and the enigmatic forms
Ornithodesmus cluniculus and Calamosaurus foxii. It has
traditionally been thought that Calamospondylus oweni, the
first British small theropod (or supposed theropod), was
renamed and redescribed as Poekilopleuron pusillus, a
taxon later given its own genus, Aristosuchus. Fox?s
correspondence with Owen, and discrepancies in the
descriptions of these specimens, show that C. oweni and A.
pusillus were based on different specimens. A. pusillus is
based on a sacrum and partial pubes from a compsognathid
coelurosaur. The whereabouts of the type specimen for C.
oweni is presently unknown.
Feathered dino exhibit in London. See story at:
May 22, 2002, Wednesday
The dino-bird has landed.
by Mark Henderson
A SET of feathered-dinosaur fossils has arrived in London
after the Natural History Museum struck a deal to display
them in Europe for the first time.
The 13 fossils, which include some of the best-preserved
dinosaur feathers unearthed, are to be restored
extensively by the museum's Palaeontology Conservation
Unit as part of the terms of the loan from the Geological
Museum of China in Beijing. The Natural History Museum
unit, one of the most advanced in the world, will also
train two Chinese scientists in fossil restoration
techniques. The specimens will then be displayed in a
major exhibition that will open in July.
The "Dino-Bird" show will feature the 13 fossils and the
museum's own archaeopteryx specimen, the first known
feathered creature, which is 147 million years old. The
feathered dinosaurs are between 122 and 125 million years
old and are all flightless. One of the most remarkable
specimens is a juvenile dromaeosaur, a 2ft long carnivore.
"It's covered all over its body in fluffy, incredibly
intricate, feathering," Angela Milner, the museum's
associate keeper of palaeontology, said. "It looks like a
steam-roller ran all over it, but it's astonishingly well-
Lorraine Cornish, acting head of the conservation unit,
said that the work would be among the most challenging
that her team had undertaken.
The fossils are very fragile, paper-thin in places, and
cannot be treated with heavy-wearing techniques such as
lasers. They will have to be treated with chemicals to
remove layers of resin, plaster and glue that have been
applied to protect them.