Temporal range: Early Cambrian – Late Devonian, 520–372 Ma
PreꞒ
Ꞓ
O
S
D
C
P
T
J
K
Pg
N
Lancastria elongata, from China.
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
†Trilobita
Order:
†Corynexochida Kobayashi, 1935
Suborders
Corynexochina
Illaenina
Leiostegiina
Corynexochida is an order of trilobite that lived from the Lower Cambrian to the Late Devonian. Like many of the other trilobite orders, Corynexochida contains many species with widespread characteristics.
The middle region of the cephalon (the glabella) is typically elongate, with the sides often spreading forward (pestle-shaped). Some species have glabellae that are effaced, meaning they are smooth and show little detail. The glabellar furrows (when not effaced) typically have a splayed arrangement. In most species, the hind pair on either side of the cephalon become spines that point sharply backwards, and the spinose tips of the anterior pairs of thoracic segments tend to become more and more forward directed toward the pygidium. The eyes are typically large. Pygidia are typically large, competing in size with the cephalon in some species.
Fossil Prochuangia from the Cambrian period of Darnjal Formation, Tabas, Iran
The tips of the thoracic segments of many Corynexochida species are spine-like (though in some species they are flush with the sides and smooth). The thorax can have 2-12 segments (rarely more), but they more typically have 7–8.
Corynexochida is an order of trilobite that lived from the Lower Cambrian to the Late Devonian. Like many of the other trilobite orders, Corynexochida...
the orders Agnostida and Asaphida, and the suborder Illaenina of the Corynexochida. Effacement is believed to be an indication of either a burrowing lifestyle...
genus of styginid trilobite in the order Corynexochida that lived during the Silurian period. "CORYNEXOCHIDA FACT SHEET". www.trilobites.info. "PBDB"...
Cambrian fossil record along with trilobites from the Redlichiida, Corynexochida, and Ptychopariida orders, and were highly diverse throughout the Cambrian...
†Eodiscina Order †Olenellina Order †Asaphida Order †Aulacopleurida Order †Corynexochida Order †Harpetida Order †Redlichiida Order †Lichida Order †Phacopida...
Australia. They are classified under the family Styginidae in the order Corynexochida. Bumastus is a large trilobite, reaching a length of 6 in (15 cm). The...
both belonging to this order. The first representatives of the orders Corynexochida and Ptychopariida also appear very early on and may prove to be even...
The Illaenidae are a family of trilobites in the order Corynexochida. 223 currently accepted species in 24 genera are known from the Ordovician. Some...
The Illaenina are a suborder of trilobites in the order Corynexochida. Illaenidae Alloillaenus, Bumastoides, Dysplanus, Ectillaenus, Harpillaenus, Hyboaspis...
Canada. ISBN 0-660-17808-7. Foster, John R. (2011). "sp.(Trilobita; Corynexochida) from the Chambless Limestone (Lower Cambrian) of the Marble Mountains...
distinguishes the genus from all other trilobites, except in some Cambrian Corynexochida such as Oryctocephalus and Fieldaspis. Thorax consists of 19–21 segments;...
Global Information
