Name/Title
TrilobiteEntry/Object ID
78.57.127Description
Description: Phylum: Arthropoda
Superphylum: Euarthropedia
Subphylum: Trilobitomorpha
Class: Trilobita
Order: Phacopida
Suborder: Calymenina
Family: Calymenidae
Genus: Diacalymene
Common Name: Trilobite
Age: Ordovician and Silurian periods.
Location: Henryhouse Formation, Hunton Group, Laurence Uplift near Ada, Oklahoma
Description: Large, very finely detailed complete fossil covering entire specimen. Matrix is light and dark gray. The fossil is a rusty brown with some lighter patches. Note that two ammonite specimens each have the 78.57.127 accession number 'painted' on them. The second one is in Case #51, Right Side, Bottom / Front Row, Left. (4.6" x 4.3" x 1.2")
Physical Characteristics:
Trilobites (meaning "three lobes") are a well-known fossil group of extinct marine arthropods that form the class Trilobita. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period (526 million years ago), and they flourished throughout the lower Paleozoic era before beginning a drawn-out decline to extinction when, during the Devonian, almost all trilobite orders, with the sole exception of Proetida, died out. Trilobites finally disappeared in the mass extinction at the end of the Permian about 250 million years ago. The trilobites were among the most successful of all early animals, roaming the oceans for over 270 million years. When trilobites first appeared in the fossil record they were already highly diverse and geographically dispersed. Because trilobites had wide diversity and an easily fossilized exoskeleton an extensive fossil record was left, with some 17,000 known species spanning Paleozoic time. The study of these fossils has facilitated important contributions to biostratigraphy, paleontology, evolutionary biology and plate tectonics. Trilobites are often placed within the arthropod subphylum Schizoramia within the superclass Arachnomorpha (equivalent to the Arachnata), although several alternative taxonomies are found in the literature.Trilobites had many life styles; some moved over the sea-bed as predators, scavengers or filter feeders and some swam, feeding on plankton. Most life styles expected of modern marine arthropods are seen in trilobites, with the possible exception of parasitism (where there is still scientific debate). Some trilobites (particularly the family Olenidae) are even thought to have evolved a symbiotic relationship with sulfur-eating bacteria from which they derived food.
Family: Calymenidae
Genus: Diacalymene
Kingdom: Animalia (Animals)
Class: Trilobita
Order: Phacopida
Phylum: ArthropodaCollection
Fossil CollectionAcquisition
Accession
78.57Source or Donor
Delmar Smith Fossil CollectionAcquisition Method
DonationDimensions
Width
4-5/16 inDepth
1-5/16 inLength
5-5/16 inLocation
Location
Container
LeftDrawer
Back Row / BottomShelf
Right, RightWall
NorthRoom
Delmar Smith HallBuilding
Crater Rock MuseumCategory
PermanentMoved By
Steve MillerDate
July 29, 2011Location
Container
LeftDrawer
Front Row / BottomShelf
Right, RightWall
NorthRoom
Delmar Smith HallBuilding
Crater Rock MuseumCategory
PermanentMoved By
Steve MillerDate
July 29, 2011Location
Container
CenterDrawer
3rd ShelfShelf
RightCabinet
Case # 51Wall
NorthRoom
Delmar Smith HallBuilding
Crater Rock MuseumCategory
Permanent
