PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Illaenus fraternus

Trilobita - Corynexochida - Illaenidae

Taxonomy

Illaenus fraternus was named by Billings (1865) [Lectotype selected by Whittington 1965]. Its type specimen is GSC 665e (lectotype), a cephalon/head (cranidium), and it is a 3D body fossil.

Sister species lacking formal opinion data

I. chiron, I. esmarcki, I. groenlandicus, I. hinomotoensis, I. ladogiensis, I. martineauensis, I. rectus, I. transmotus, I. transversus

Year	Name and author
1865	Illaenus fraternus Billings p. 276 figs. 262a, b
1925	Illaenus fraternus Raymond p. 105

Time interval	Ma	Country or state	Original ID and collection number
Whiterockian	470.0 - 457.3	USA (Nevada)	Illaenus fraternus (104424)
Whiterockian	470.0 - 457.3	Canada (Newfoundland and Labrador)	Illaenus fraternus (104877 104880 104881 104883 104884 104887)