A far more complete presentation of trilobite images,
links, and related information can be found at Kevin
Brett's Trilobite home
page.
The quality of some images presented here is not great
because I often use a video-capture setup with limited
resolution. It is more convenient than film, and, most
importantly, it saves film and processing costs for a
project which is just for fun.
The trilobite images are arranged in approximate
stratigraphic order, with the oldest at the bottom and
youngest at the top, and subdivided into geologic periods.
Additional information is available on the subdivision of
the geologic time
scale.
No specimens available, yet. Trilobites are comparatively
rare after the Devonian.
Cheirurus
A specimen of Cheirurus (Crotalocephalina) gibbus
(Beirich) from Devonian-age rocks in Morocco. This phacopid
trilobite has a bizzare inflated glabella and hypostome.
Lateral View -- colour
Oblique Lateral View -- greyscale
In this image, like most scientific illustration, the
specimen is coated with ammonium chloride sublimate in
order to reduce the effects of colouration and enhance
surface morphological features and contrast.
Detail of cephalic region -- greyscale
This image shows an eye and some of the detailed
ornamentation on the cephalon.
Phacops rana
Moscow Formation, Devonian, Erie County, New York, U.S.A.
slab with several
specimens
complete specimen
two cephalons
detail of cephalon,
showing eye
detail of schizochroal
eye
detail of schizochroal eye,
dorsal view
Leonaspis williamsi
Haragan Formation, Devonian, Coal Co., Oklahoma, U.S.A.
Leonaspis
williamsi
?Acaste sp.
Stonehouse Formation, Late Silurian (Pridoli), near
Arisaig, Nova Scotia.
Note the large schizochroal eye and furrowed glabella.
McLearn, 1924 assigned this species to Dalmanitina,
but I suspect it is Acaste downingiae (Murchison),
or a close relative. Unfortunately, I know of no subsequent
published work on the trilobites of Arisaig, so I can not
confirm the identification.
cephalon
Homalonotus sp.
Green Member, Moydart Formation, Late Silurian (Ludlow),
near Arisaig, Nova Scotia, Canada.
This specimen comprises only the cephalon, but is
remarkably well preserved compared to most
Homalonotus specimens in this formation. Even the
hypostome is preserved (the two triangular projections just
above the anterior margin). Unfortunately, without the
pygidium, this specimen can not be identified to species
level. The specimen is coated with KOH sublimate, and is
about 5 centimetres wide.
cephalon
Diacalymene
A specimen of Diacalymene ouzregui from
Ordovician-age rocks near Erfoud, Morroco.
dorsal view lateral view posterior view anterior view
Flexicalymene
A specimen of Flexicalymene from Ordovician-age
rocks near Arnheim, Ohio. The family resemblance to
Diacalymene is pretty obvious. This photo was taken
by Rick Larush (rick@geo.ucalgary.ca).
Pseudogygites latimarginatus
This trilobite specimen is an ammonium chloride coated
latex cast of an external mold. Middle Ordovician, near
Collingwood, Ontario.
Pseudoogygites
latimarginatus
Triarthrus sp.
Ordovician, south shore of the Ottawa River, Ottawa,
Ontario, Canada. A partial cephalon with only one genal
spine preserved. The specimen is partly replaced by pyrite.
Triarthrus
spinosus
Homotelus bromidensis
Bromide Formation, Ordovician, Criner Hills, Carter County,
Oklahoma, U.S.A.
Ogygiocaris carella
Ordovican, Llandvirn, Rorrington Green, Shropshire,
England.
Note the structural deformation.
Ogygiocaris carella
-- complete
Amphilichas halli
Waynesville Formation, Ordovician, Clinton Co., Ohio,
U.S.A.
Amphilichas
halli
Asaphiscus wheeleri Meek
Wheeler Formation, Middle Cambrian, Antelope Springs, Utah,
U.S.A.
complete specimen
Elrathia kingii (Meek)
Wheeler Formation, Middle Cambrian, Antelope Springs, Utah,
U.S.A.
complete
specimen
Olenellus sp.
Forteau Fm., Late Cambrian, Mt. St. Margaret, Car Bay,
Northern Peninsula, Newfoundland, Canada.
Olenellus sp
Olenoides serratus
From the middle Cambrian Burgess
Shale, Walcott Quarry, Stephen Formation, near Field,
British Columbia, Canada.
Olenoides serratus
Peronopsis interstricta (White)
Wheeler Shale, Middle Cambrian, House Range, Utah. An
agnostid (Order Agnostida) trilobite, with only two
thoracic segments.
Peronopsis
interstricta
Trilobites from Murchison's Siluria, 1867
Unless otherwise noted, images are copyright (c) Andrew
MacRae, email: macrae@geo.ucalgary.ca,
and are freely distributable for non-commercial use
provided the original source is indicated.