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Temporal range: Pragian to Emsian
Dicranurus hamatus elegantus, Early Devonian, Haragan Formation, Coal County, Oklahoma, USA - Houston Museum of Natural Science - DSC01680.JPG
Dicranurus hamatus elegantus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Trilobita
Order: Odontopleurida
Moore, 1959
Family: Odontopleuridae
Genus: Dicranurus
  • D. hamatus
  • D. elegans
  • D. monstrosus

Dicranurus ("Twin head-tail") is a genus of Lower to Middle Devonian odontopleurid trilobites that lived in a shallow sea that lay between Euramerica and Gondwana, corresponding to modern-day Oklahoma and New York, and Morocco, respectively. As such, their fossils are found in New York, Oklahoma, and Morocco.

Dicranurus monstrosus fossil

Their bodies averaged about 1-inch (25 mm) or so, in length, though their large spines made them at least 2 inches (51 mm) in length. It is speculated that such tremendous spines hampered the ability of predators, such as arthrodire placoderms, to attack them, as well as to help prevent them from sinking into the soft mud of their environment. Dicranurus trilobites are distinguished from other odontopleurids by the pair of large, curled, horn-like spines that emanate from behind the glabellum. The genus name refers to these distinctive horns, in fact.

External links[edit]

  • Description of Haragan Formation, Oklahoma [1]
  • Fossil Mall's description of D. elegans [2]
  • Fossil Mall's description of D. hamatus [3]
  • Fossil Museum's description of D. monstrosus [4]