Eryops megacephalus
Permian Vertebrates
of Waurika, Oklahoma
The fossils on this page all originate from the Lower Permian Waurika locality in Oklahoma. This site has been known
for over 100 years and in that time has been extensively collected. Listed below are some of the many different
fossils that occur at the site. Although much of the material is well known, occasionally some unusual material occurs,
which is probably undescribed. The site was originally assigned to the Ryan Formation, which covers the latest
Pennsylvanian or lower most Permian, but recently it has been assigned to the Lower Permian Wellington - Garbar
Complex. You can order any of the fossils illustrated by
clicking here
© L. Martin
Amphibians & Reptiles
Eryops jaw with tooth and associated remains - £50/$80
A very rare piece of Eryops lower jaw with a large tooth still in place. The tooth tip is
damaged but this could easily be restored. The bone detail is excellent and this is a
piece of the jaw near the symphasis. There is an empty tooth socket where an even
larger tooth used to be. Comes with some broken teeth and skull plates that were found
in association with it and are probably from the same animal. A rare piece.
Eryops Teeth - £10/$15
Good quality teeth with nice
enamel and worn (not broken tips).
Typically 1/2 inch and longer
Eryops megacephalus claw - £75/$125
23mm - 7/8 inch excellent, complete claw.
This is a nice, big and rare claw. Another
excellent specimen
Eryops Teeth - £25/$45
Excellent quality teeth with nice
enamel and tips. Wonderful
specimens. ~1/2 inch and longer
Diadectes sp.
Diadectes sp. #1
£75/$125
Excellent incisor
18mm - 5/8 inch
Diadectes sp. #2 £50/$80
Very good incisor
13mm - 1/2 inch
Diadectes sp. #3 £20/$35
Two worn teeth
~10 mm - 3/8 inch
Eryops toe bones - £5/$8 each
~10 mm (3/8 inch) toe bones.
Trimerorhachis Claw - £25/$35
10 to 15mm excellent claws with
complete tips
Trimerorhachis insignis
Trimerorhachis scapula - £35/$55
60mm - 2 inches and still housed in
a nice matrix block.
Trimerorhachis insignis - SKIN #1     £65/$100
A very rare ~60mm - 2 inch long section of scaly skin from
Trimerorachis. Nice details and very rare
Trimerorhachis toe bone - £3/$5
~7 to 10mm toe bones showing
excellent bone preservation
Archeria heteroclitus ~10mm/0.5 inch vertebrae
£4/$6 each
Archeria heteroclitus ~20mm/0.75 inch vertebrae
£10/$15 each
Archeria heteroclitus
For some reason it is only the vertebral centra of Archeria that are readily preserved. Although they occur at
several sites throughout the Lower Permian, more often than not it is only these distinct centra which are found.
Why is not clear but they are not a common animal.
Diadectes was a large animal with powerful limbs. Early
researchers believed that it may well be a burrowing animal due
to the robust nature of the limbs. Another important feature of this
group if that they were one of the first animals to have a
differentiated dentition - specifically teeth that looked like incisors,
premolars and molars.
Diplocaulus magnicornis
Diplocaulus claw - £40/$65
This specimen is a rare claw from the famous
boomerang headed amphibian
Diplocaulis. The claw is
complete and is housed in a one inch gem jar. The
specimen measures ~10 mm long and has a good tip.
This is a distinct claw with a narrow, tapering form. One
of the rarer parts of the Waruika fauna.
Diplocaulus toe - £15/$25
This is the first toe bone that we
have had from
Diplocaulis. They
are notably more elongate than
the other amphibian toes from
Waurika. Specimen measures
~10 mm long.
Orthocanthus compressus
3 shark fin spines
Largest ~12 mm - 1/2 inch
£12/$20
Orthocanthus compressus
Complete shark tooth
~15 mm - 5/8 inch
£15/$25
Anodontacanthus sp.
Repaired fish spine.
Quite rare
~55 mm - 2 inches
£15/$25
Miscellaneous
Archeria complete vertebra with neural spine - £50/$85

This is a very rare specimen in that it is essentially complete. Despite showing the
porous appearance typical of the poorly ossified bones of this animal, the centrum is
complete and preserves the neural arch and much of the neural spine. It is the most
complete example of its type that we have seen. Measures 40mm / 1.5 inches tall.
Archeria complete digit with ungual - £100/$150

This is a another very rare specimen in that toe bones and
unguals of this animal are rarely preserved. Again, the poor
ossification of the bones is believed to be the reason they are
underrepresented in the fossil record. Comes in a nice glass
fronted 60 mm / 2.25 inch display box. The digit has a total
length of 55mm / 2.125 inches.
Diadectes rooted molar - £175/$300

This tooth is the largest molar we have ever seen from
Diadectes. Measuring 22 mm / 0.8 inches long this is a
super rooted specimen. The crown is intact, if a little
distorted, but this is the maximum size that these teeth
reached. Definitely from a mature adult and a text book
example of a Diadectid molar.
Diadectes large incisor - £75/$125

This tooth is the largest incisor we have ever seen from Diadectes and was
found in close association to the molar listed above. Measuring 20 mm / 0.75
inches long this is a very nice specimen. The crown is intact and this is about
the maximum size that these teeth reached. Definitely from a mature adult and
a text book example of a Diadectid incisor.
Diadectes rooted premolar - SOLD!

This is a monstrous tooth with a complete root. The crown has been reattached but
other than that there is no damage. At  29 mm / 1.125 inches long this the largest
Diadectid tooth we have ever had. If there was ever a Diadectid tooth to add to
your collection this is one of them. A stunning tooth and extremely rare in this size.
Diadectes rooted anterior molar - £175/$300

Another very nice rooted Diadectid tooth. This specimen has a slightly
less complete root than the previously figured specimen but the
crown is just as nice showing the diagnostic shape and beautiful
glossy enamel. The specimen measures 20 mm / 0.8 inches long and
is another text book example of a Diadectid tooth.
Diadectes rooted anterior molar #2 - £75/$125

Another very nice rooted Diadectid tooth but on a smaller scale. Despite the
smaller size the tooth still shows showing the diagnostic shape and beautiful
glossy enamel. The specimen measures 16 mm (5/8 inch) long and is another
text book example of a Diadectid tooth.
Diadectes digit with ungual - £200/$325

A very rare example of a Diadectes ungual and two
toe bones. All the specimens are complete and the
ungual is particularly nice. Comes housed in a 60mm /
2.25 inch glass fronted display box as shown. The
combined length of the fossils is 36 mm / 1.375 inches.
Eryops megacephalus Lower Jaw with teeth - £750/$1250
This is one of the best specimens we have ever had from Waurika, and it is also one of the rarest. It is a frontal
section of the lower jaw from the giant amphibian Eryops megacephalus. There are 5 teeth preserved in the jaw
and the section represents the symphysis and the first one quarter of the jaw. The bone preservation is as good
as it gets and the teeth are complete. This is a stunning display piece. Any Permian jaw section with teeth is a
rarity, and this is a beauty.
Eryops megacephalus digit with ungual #1 - £75/$125

For those collectors not needing a complete Eryops foot we can offer this very good
quality digit consisting of two toe bones and an ungual. All the pieces are complete and
come housed in a 60 mm/ 2.25 inch glass fronted display box as shown. The combined
length of the specimens is 45 mm / 1.75 inches.
Eryops megacephalus digit with ungual #2 - SOLD!

For those collectors not needing a complete Eryops foot we can offer this very good
quality digit consisting of two toe bones and an ungual. All the pieces are complete,
although the ungual is missing the back, right corner as seen in the image. Comes
housed in a 60 mm/ 2.25 inch glass fronted display box as shown. The combined length
of the specimens is 40 mm / 1.5 inches.
Eryops megacephalus skull plate - £6/$10

These nice pieces of Eryops skull shown the deeply pitted surface
of the thick bone. Bone preservation is excellent making these
nice, affordable additions to any collection.
Eryops megacephalus fang - £50/$80

Fang teeth such as these were often housed in the root of the
mouth on distinct platforms and were used to grab food and help
guide it down the throat. Each tooth is complete as shown and
measures approximately 30 mm/ 1.125 inches long. These are
nice, big teeth.
Diplocaulus vertebra - £10/$15
Diplocaulus had distinct vertebrae that although
uncommon at Waurika are occasionally nicely
preserved. These specimens all show the odd
imperfection but are good representatives of the
types. Measuring ~ 12 mm / 0.5 inches long.
Diplocaulus jaw with 5 teeth - £75/$125
This is another rare specimen. It is part of the upper jaw of Diplocaulus. Not only is the distinct pitting of the skull
preserved on the upper surface but there are five complete teeth.  A very nice specimen and only the second jaw
section we have had. Measures ~12 mm / 0.5 inches long.
Diplocaulus tibia - £50/$80
This is another rare specimen that arrived too late for illustration in our book. It is the only one
like it we have ever had. The limb bone is complete and measures ~45 mm / 1.75 inches long.
Diplocaulus skull plate - £3/$5
Diplocaulus had distinct pitting on the skull is
preserved in these specimens. Nice details
with a typical specimen measuring ~ 15 to 20
mm / 0.5 to 0.75 inches long.
Trimerorhachis intercentra - £6/$10
A very good quality complete intercentrum from
Trimerorhachis, the most common Lower Permian
amphibian. (Please specify type 1 or type 2)
Type 1 - Waurika
Type 2 - Frederick