Phacopida Trilobites

Trilobites

Phacopida Range Over Geologic TimePhacopida is a large order of class trilobita. It is the last trilobite order to evolve, appearing in the early Ordovician. The phacopid's progenitor is unknown and ranks as one of the mysteries of trilobite phylogeny. The three sub orders of Phacopida (Phacopina, Calymenina, and Cheirurina) are united by a unique early protaspis developmental stage (before segments develop) having three pairs of spines. While suborders Cheirurina and Calymenina retained the holochroal eyes of most trilobites, suborder Phacopina had most developed and impressive schizochroal compound eyes with up to 700 individual lenses.

Read more about phacopid trilobites.

Trilobite Order Phacopida

  • Suborder Calymenina
    • Superfamily Calymenoidea
  • Suborder Phacopina
    • Superfamily Phacopoidea
    • Superfamily Dalmanitoidea
    • Superfamily Acastoidea
  • Suborder Cheirurina
    • Superfamily Cheiruroidea

Also see: Phacopida Trilobites Classification

Phacopid Trilobite Fossils

Spathacalymene nasuta
Dipleura dekayi
Flexicalymene granulosa
Flexicalymene senaria
Spathacalymene nasuta
Silurian
Suborder Calymenina, Superfamily Calymenoidea, Family Calymenidae
Ripley County, Indiana
Dipleura dekayi
Middle Devonian
Suborder Calymenina, Family Homalonotidae 
Campito Formation, Nevada
Flexicalymene granulosa
Ordovician
Suborder Calymenina, Superfamily Calymenoidea, Family Calymenidae
Martinsburg Formation, Pennsylvania
Flexicalymene cf senaria
Ordovician
Suborder Calymenina Superfamily Calymenoidea
Family Calymenidae
Sugar River Formation,
New York
Flexicalymene meeki Trilobite
Pradoella tazzarinensis Phacopid
Calymene breviceps
Rare Calymene barnesi Trilobite
Flexicalymene meeki
Ordovician
Family Calymenidae
Richmond Formation, Ohio
Pradoella tazzarinensis
Ordovician
Suborder Calymenina Superfamily Calymenoidea
Family Calymenidae
Draa Valley, Morocco
Calymene breviceps
Silurian
Suborder Calymenina Superfamily Calymenoidea
Family Calymenidae
Waldron Shale, Indiana
Calymene barnesi
Silurian
Suborder Calymenina
Superfamily Calymenoidea
Family Calymenidae
Jupiter Formation, Quebec, Canada
Calymene conradi
Calymene celebra
Gravcialymene Phacopid Trilobite
Calymene conradi
Ordovician
Suborder Calymenina
Superfamily Calymenoidea
Family Calymenidae
Lorraine Shale, New York
Calymene celebra
Silurian
Suborder Calymenina
Superfamily Calymenoidea
Family Calymenidae
Joliet Formation, Illinois
Gravcialymene sp
Devonian
Suborder Calymenina Superfamily Calymenoidea
Family Calymenidae
Utica Shale, New York
Eldregeops Trilobite
Dalmanites limulurus
Dalmanitina proeva
Pseudocybele nasuta
Devonian
Suborder Phacopina
Family Phacopidae
Hamburg Group, New York
Silurian
Suborder Phacopina
Family Dalmanitidae
Rochester Shale, New York
Ordovician
Suborder Phacopina
Superfamily Dalmanitoidea
Family Dalmanitidae
Ktoua Formation, El Kaid Errami, Morocco
Ordovician
Suborder Phacopina
Order Phacopida
Family Pliomeridae
Fillmore Formation, Utah
Drotops armatus
Lochovella Trilobite
Enrolled Eldregeops Phacopid Trilobite
Devonian
Suborder Phacopina Superfamily Phacopoidea
Family Phacopidae
Erfoud, Morocco
Devonian
Suborder Phacopina
Family Phacopidae
Haragan Formation, Oklahoma
Ordovician
Suborder Phacopina
Family Pliomeridae
Fillmore Formation, Utah
Devonian
Suborder Phacopina
Family Phacopidae
Windom Shale, New York
Quadrops flexuosa Phacopid Trilobite
Greenops barberi Phacopid Trilobite
Drotops megalomanicus
Huntoniatonia lingulife
Devonian
Suborder Phacopina
Superfamily Acastoidea
Family Acastidae
Oufaten, Morocco
Devonian
Suborder Phacopina Superfamily Acastoidea
Family Acastidae Hamilton Group, New York
Devonian
Suborder Phacopina Superfamily Phacopoidea
Family Phacopidae
Alnif, Morocco
Devonian
Suborder Phacopina Superfamily Dalmanitoidea
Haragan Formation, Oklahoma
Spinodontochile spinifer
Kayserops
Rare Struveaspis
Delocare rostrata
Devonian
Suborder Phacopina Superfamily Dalmanitoidea
Family Dalmanitidae
Alnif, Morocco
Devonian
Suborder Phacopina Superfamily Acastoidea
Family Acastidae
Subfamily Asteropyginae
Oued Ghris, Morocco
Devonian
Suborder Phacopina Superfamily Phacopoidea
Family Phacopidae
TaFrawte, Morocco
Devonian
Suborder Phacopina Superfamily Acastoidea
Family Acastidae
Subfamily Asteropyginae
Mrakib, Morocco
Eocryphops
Phacops araw
Walliserops hammi
Acastoides zguilmensis
Devonian
Suborder Phacopina Superfamily Phacopoidea
Family Phacopidae
Jorf, Morocco
Devonian
Suborder Phacopina Superfamily Phacopoidea
Family Phacopidae
Aatchana, Morocco
Devonian
Suborder Phacopina Superfamily Acastoidea
Family Acastidae
Ziguilma, Morocco
Devonian
Suborder Phacopina Superfamily Acastoidea
Family Acastidae
Foum Ziguid, Morocco
Mucronaspis zagoraensis
Paciphacops campbelli Oklahoma Trilobite
Bellacartwrightia whiteleyi 
Coltraenia oufatenensis
Devonian
Suborder Phacopina
Family Dalmanitidae
Boutschrafin, Morocco
Devonian
Suborder Phacopina
Superfamily Phacopoidea
Family Phacopidae
Haragan Formation, Oklahoma
Devonian
Suborder Phacopina Superfamily Acastoidea Family Acastidae
Hamburg Group, New York
Devonian
Suborder Phacopina
Superfamily Acastoidea
Family Acastidae
Oufaten, Morocco

Phacopida Suborder Cheirurina

Actinopeltis Trilobite
Eccoptochile mariana
Crotalocephalus Trilobite
 
Ordovician
Suborder Cheirurina
Superfamily Cheiruroidea
Family Cheiruridae
El Kaid Errami, Morocco
Ordovician
Suborder Cheirurina Superfamily Cheiruroidea
Family Cheiruridae
Zagora, Morocco
Middle Devonian
Suborder Cheirurina
Family Cheiruridae
Alnif, Morocco