Scolecodonts are the fossilised jaw apparatus
of polychaete worms. They were abundant
throughout the Ordovician but are less
common after the Silurian. They can be locally
abundant, but do not occur in every marine
assemblage. In the Silurian of Gotland (where
many of the specimens on this page are from)
they can be quite common and are often
found in association with Chitinozoa. In fact, it
has been suggested Chitinozoa may be the
egg cases of early polychaetes, but this has
not been confirmed.

Like conodonts and chitinozoa, scolecodonts
are usually preserved as black or brown fossils
in limestones and shales, and are resistant to
acid preparation. This makes them easy to
pick from the white residues of processed
limestones. We offer unpicked matrix samples
on this page but none have been acid
prepared in order to preserve the rest of the
fauna which would otherwise be dissolved. All
have been boiled and sieved to make them as
clean as possible. Preservation is usually

The most abundant genus in the Gotland
deposits is
Kettnerites, of which several
species, subgenera and subspecies are
present. Scolecodonts show a great deal of
morphological variation within the same
species and subspecies, which at times makes
identification complicated (see images right).
Silurian Scolecodont Matrix Samples
The following samples from the Silurian of Gotland contain scolecodonts. They are relatively
abundant and show very good preservation. All are available only in limited quantities. Each
sample comes in a gel capsule that measures ~1 inch long. Specimens are partial to complete.
MI left and right jaw elements of Kettnerites
(Kettnerites) abrahami abrahami.
Note the
differences yet these are the same subspecies.
Left and right MII jaw elements of
Kettnerites (Kettnerites) abrahami
Again, note the obvious
differences yet these are still the
same subspecies.
Silurian Scolecodont Mounted Specimens
Horsne - Halla Beds

This is the richest
scolecodont bearing
matrix we have seen.
Several specimens
occur in every sample.
Gothemshammer II
Halla Beds - £4/$6
A nice sample with several
specimens in every capsule.
Gothemshammer I - Halla Beds - £5/$8
This sample has small scolecodont
species but it also contains thelodont fish
scales. This is the only sample we have
come across that contains fish remains.
There are several scales in each sample,
but they are small so search carefully
Kneipbyn - Hogklint Beds - £5/$8
This sample contains both chitinozoa and
scolecodonts. The latter are not as common as in
other samples, but the chitinozoa are a nice addition.
Kettnerites MIII element - £3/$5
A good quality specimen showing
the typical features of this anterior
jaw element.
Protarabellites element - £3/$5
A good quality specimen showing
the typical features of this
posterior jaw element.
The following specimens are all mounted in custom labelled micropalaeontology capsules. These are
designed for those collectors not wanting to sort through matrix. No further preparation is required
and they are ready for immediate microscopy. The specimens are held in place with a water based
glue and can be easily repositioned as necessary. Most are ~1mm in length.

Most of the images below are Scanning Electron Microscope photographs of
actual specimens in our
collection and illustrate the type and quality of the fossils you will receive.
Ordovician Scolecodonts - Indiana
The following specimens come from the Waynesville Formation (Richmond Group) of Indiana. The
material dates from the Cincinnatian stage of the Ordovician.
Waynesville coarse - £15/$25
This material was collected 50 years
ago and is still housed in the old
style glass vial. The label is new and
the sample contains abundant, but
often incomplete, scolecodonts. Still
a rare and good sample.
Atraktoprion sp. - £4/$6
Rhamphoprion sp. - £4/$6
Protarabellites sp. - £3/$5
Hadoprion sp. - £5/$8
Oenonites sp. - £4/$6
Kaloprion sp. - £4/£6
The following specimens are mounted in custom labelled micropaleontology capsules and represent
a variety of genera found in the Ordovician. All specimens are similar to those shown with an equal
degree of completeness. Nice clean examples.
Kettnerites MI element - £3/$5
A good quality specimen showing
the typical features of this
posterior jaw element.
Kettnerites MII element - £3/$5
A good quality specimen showing
the typical features of this medial
jaw element.