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These dinosaurs are only known from material that cannot be used to determine taxa, so are unnamed, unless stated otherwise...

These dinosaurs have yet to be formally described, and may never be...

The dinosaurs below are either misidentified or synonyms (see FAQ)

A bit about Isle of Wight Brachiosaurs

This dinosaur, unofficially known as "Angloposeidon", is known from a single cervical vertebra, which measures somewhere in the region of 75cm in length, and is relatively complete though it is partially crushed. There is enough present, however, to assign it to the Brachiosauridae, with many similarities with the North American genus Sauroposeidon, although there is enough differences to determine it as a new taxon, although there is a chance it may belong to one of the already known brachiosaurids from the Isle of Wight.

This represents the largest known brachiosaurid vertebra known from Europe, and is similar in scale to Brachiosaurus from Tanzania, Africa. This would make the entire animal somewhere in the region of 20 metres in length.
The specimen, MIWG 7306, is currently on display at Dinosaur Isle.

Further Information.

All information on this specimen taken from Naish et al, 2004
mon Clabby 2006


indet. tetanuran theropod (MIWG 6350)

Known from some partial pubic bones and a femoral fragment, this theropod has just enough material for it to be identified as being different to all the other theropod dinosaurs known from the Isle of Wight. It appears to be a basal tetanuran or indeterminate classification, although it is not a coelurosaur (see below)

The pubes curve gently backwards, the two medial flanges of which form an apron (in other words, bony shelves project inwards from the inner surfaces of both pubic shafts) that is separated for about half of its length by a long slit. A blunt pubic boot, consisting of the conjoined ends of both pubes, is present. The projecting anterior part is missing, but its posterior part is wide and tapers less than the pubic boots of coelurosaurs. the halves of the ubic boot are not fully joined, suggesting this was not a fully grown specimen, even though via compparison with similar theropods, that this dinosaur would have been just over 5 metres in length!

The femur fragment consists of the distal end. Both condyles are preserved, as is a deep extensor groove on the fragment's anterior surface

All information on this specimen taken from Benson et al, 2009, via Tet Zoo

Simon Clabby 2006

"indet. sauropod"

Sauropod dinosaur, known from a well-preserved chevron (V-shaped bone attached to the ventral surface of caudal vertebrae, sometimes called haemal arches), with fragile plate-like anterior process and less pronounced dorsal process, was found near Grange Chine in 1975. Although similar to Diplodocus, the midline slit is shorter and narrower, so may belong to a dicraeosaurid. However, the 'sled-like' morphology supporting a diplodocoid assignation is now thought to have been primitive for neosauropods, rather than derived, so may not be a diplodocoid at all

Also, BMNH R9224, a 170mm long caudal vertebra from Brighstone Bay, BMNH R11187, a first metatarsal and MIWG.6593, a fragmentary ischium.

All information on this specimen taken from Martill and Naish, 2001d

Simon Clabby 2006

indet. Rebbachisaurid Mannion, 2008
A sauropod dinosaur, known from isolated teeth, already figured in Naish and Martill 2001d, but only identified as such in Sereno and Wilson 2005 and Fowler, in press.and an incomplete scapular, which displays the extreme dorsoventral expansion of the scapular blade and the “hook”-like acromial process that are characteristic of rebbachisaurids.

Simon Clabby 2006 Clabby 2006

?'Titanosaurus lydekkeri' Huene, 1929

The only ?'Titanosaurus' (gigantic lizard) specimen is an isolated anterior caudal vertebra from the distal half of the tail, which was, unusually for an Isle of Wight dinosaur, found in the Upper Greensand. the vertebra consists of a centrum, which is strongly procoelous and may have had transverse processes, indicated by broken ridge-like areas close to the top, has a slight transverse compression and convex dorsoventral lateral surfaces that merge smoothly into the ventral surface. There is no ventral excavation, and there is an absence of ventrolateral ridges. There is no horizontal ridge at the neurocentral junction, and the base of each prezygapophysis is preserved, although little detail can be seen. There is also a partial neural arch.
Although this appears to be to a titanosaur, there are no distinguishing features that diagnose it as any specific genus.

A titanosaur by S. M. Clabby

All information on this specimen taken from Martill and Naish, 2001d and Wilson and Upchurch, 2003
Simon Clabby 2006 Clabby 2006


Indet. Velociraptorines

The presence of dromaeosaurs in the Wessex fauna has been predicted for some time based on the known palaeobiogeographical distribution of this group of dinosaurs. However, until 2003 their remains had not been recognized. During the course of work on the microvertebrate fauna of the Wessex Formation, Island resident and research palaeontologist Steve Sweetman identified a number of teeth in his collection (one of which he found in 1972) that are attributable to velociraptorine dromaeosaurs. A search of other local collections revealed three further specimens bringing the total to seven. The specimens have been donated to the collections of the Isle of Wight Museum Service.

The largest of the teeth are similar in size to the teeth of the dromaeosaurine dromaeosaur Utahraptor, from the Cedar Mountain Formation of Utah, which is the same age as the Wessex Formation of the Isle of Wight. It is possible therefore that the Isle of Wight velociraptorine dromaeosaur could have been of similar size to Utahraptor, making it the largest velociraptorine yet discovered. Uncertainty concerning the number of taxa represented by the specimens and other considerations have prevented the naming of a taxon based on the teeth but they do represent the first unequivocal record of dromaeosaurs in the Wessex Formation, although Ornithodesmus is most probably a dromaeosaur too, but that assignation is debatable.

The known teeth have a DSDI (Denticle-Size Difference Index [See here for how this is worked out]) of between 1.37 and 1.6. There are unflexed mesial carinae that divide the mesial margin of the crown symmetrically. Where present, mesial denticles are smaller than those present on the distal carinae. Uniformly sized denticles are present along most of the mesial and distal carinae but shrink progressively towards the tooth tip and base. A wear facet at the tooth tip is present, having removed the most apical denticles and breached the enamel, and is orientated obliquely towards the mesial carina, and more denticles have been removed from the mesial carinae than from the distal carinae. The denticle bases on the distal carinae are apicobasally compressed and strongly rectangular in outlinecompared to the mesial carinae, which are either labiolingually compressed or approximately square in basal profile. The distal denticle tips are apicobasally inflated and convex, and in lateral profile are almost axe-like.

Further Information.

based on Velociraptor

All information on these specimens taken from Sweetman, 2004 and from personal communication with Steve Sweetman.
Simon Clabby 2006


Unpublished Dinosaurs
and Other Relevant Finds

  • Dollodon, one of the many ornithopods previously called Iguanodon
  • At least one tyrannosauroid, distinct from Eotyrannus
  • A diplodocoid, distinguished from indet. sauropod, which was originally classed as a diplodocoid
  • Indet. theropod, of unknown affinity. Had massive hands though...
  • Suchosaurus - Previously classified as a crocodilian, the type material (teeth) has been reassigned to the spinosauroidea, and may be synonymous with Baryonyx. However, until anything is published, it's uncertain if the Isle of Wight Suchosaurus is the same or just indet. crocodilian material lumped within the genus.
  • Dinosaur eggshell, although a possible dinosaur egg was reported by van Straelen in 1928 from the Wealden of the Isle of Wight which is considered dubious by some authors (Carpenter and Alf, 1994).

Please note that this list is not meant to represent any material that is awaiting publication. If you recognise any of the dinosaurs as being the subject of your upcoming paper, please contact me.
Simon Clabby 2006


Cetiosaurus brevis Owen, 1842
Pronounced 'SEET-ee-oh-SAW-russ Brev-ISS'

An alleged sauropod, known on the Isle of Wight from several vertebrae from Sandown Bay and Culver Cliff and very fragmentary vertebrae and limb elements from the Wessex Formation of Brook. If all these belonged to the same individual, then they would have been the second most complete Isle of Wight sauropod, diagnosed on the basis of a low centrum Length: Height (l:h) ratio, a derived condition present in the anterior caudal centra of eusauropods. However, recently it has been demonstrated that all the material assigned to C. brevis by Owen belongs to Iguanodon (which also has a low l:h ratio in the posterior dorsals), with the exception of BMNH R2544–2550 which represent an indeterminate sauropod. Most specimens are too poorly preserved to be identified precisely and may not even be confidently assigned to the Sauropoda.

All information on this specimen taken from Martill and Naish, 2001d and Upchurch and Martin, 2002

For information on actual Cetiosaurus fossils, visit DinoWight EXTRA
Simon Clabby 2006


Megalosaurus Buckland, 1824
Pronounced 'Meg-a-low-SAW-russ'

If it's on the Isle of Wight, then it's most likely Neovenator, as most Megalosaurus material across the world has turned out to be something else, e.g. Dilophosaurus, Allosaurus, Plateosaurus, etc.

For information on actual Megalosaurus fossils, visit DinoWight EXTRA
Simon Clabby 2006


Polacanthoides Nopsca, 1929
Pronounced 'Pole-a-CAN-THOI-dees'

Known from an isolated tibia, humerus and possibly a scapula, almost certainly Polacanthus
Simon Clabby 2006


stegosauria indet (Regnosaurus?)
Pronounced 'Regg-no-SAW-russ'

Known only from a pubis on the Island, this specimen has been better described from material found on the mainland in Surrey. The pubis, although incomplete, has a stout prepubic process and a slender postpubic process, similar to Iguanodon, but the prepubic process shows no flaring and there is no anterior recess next to the position of the acetabulum, which suggests stegosaur.However, the acetabular surface of "Regnosaurus" laterally, posteriorly and dorsally, in stegosaurs this surface faces wholly laterally. It is therefore more likely that this specimen is from an Iguanodontoid.

All information on this specimen taken from Naish and Martill, 2001c and Galton, 2009
Simon Clabby 2006


Vectensia Delair, 1982
Pronounced 'Veck-TEN-see-ah'

nomen nudem, known only from a triangular flat sided bony spike, about 25cm (10 inches) long, but possibly Polacanthus
Simon Clabby 2006


Vectisaurus Hulke, 1879
Pronounced 'Veck-TISS-or-uss'

Juvenile specimen of Mantellisaurus

Simon Clabby 2006

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