The Phacopina comprise a suborder of the trilobite order Phacopida. Species belonging to the Phacopina lived from the Lower Ordovician (Tremadocian) through...

expanded glabella, short or absent preglabellar area, and schizochroal (Phacopina) or holochroal (Cheirurina and Calymenina) eyes. Schizochroal eyes are...

groups show secondary lost facial sutures, such as all Agnostina and some Phacopina. Another common feature of the Olenellina also suggests this suborder...

development of Dalmanitina, and the evolution of facial suture fusion in Phacopina". Paleobiology. 44 (4): 638–659. Bibcode:2018Pbio...44..638D. doi:10.1017/pab...

close to the common ancestor of the Phacopina. Gyrometopus is phacopid in appearance, but unlike in other Phacopina, a rostral plate is present, although...

of any other insect, resembling the eyes found in the trilobite group Phacopina. Instead of a compound eye consisting of hundreds to thousands of ommatidia...

the subclass Librostoma. Unlike the trilobites of the phacopid suborder Phacopina, whose eyes are schizochroal, the proetids have the more common holochroal...

and earliest Upper Devonian of Morocco and the USA. Like in all sighted Phacopina, the eyes of Eldredgeops are composed of very large (0.5mm in Eldredgeops...

Animalia Phylum: Arthropoda Class: Trilobita Order: Phacopida Suborder: Phacopina Family: Pterygometopidae Genus: Isalaux Frederickson & Pollack, 1952 Species...

Auffray, Jean-Christophe (2004). "Variation in the eye of Acuticryphops (Phacopina, Trilobita) and its evolutionary significance: a biometric and morphometric...