Bolbocephalus

Bolbocephalus is a genus of proetid trilobites in the family Bathyuridae. Species lived during the early part of the Arenig stage of the Ordovician Period,^[1] a faunal stage which lasted from approximately 478 to 471 million years ago, in marine strata of the United States, Canada, and Greenland.^[2]

Bolbocephalus Temporal range: Early Arenig[1]
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Clade:	†Artiopoda
Class:	†Trilobita
Order:	†Proetida
Family:	†Bathyuridae
Subfamily:	†Bathyurinae
Genus:	†Bolbocephalus Whitfield, 1890
Type species
Bathyurus seelyi Whitfield, 1886
Other species
B. angustisulcatus Poulsen, 1927 B. convexus (Billings, 1865) B. ellesmerensis Adrain & Westrop, 2005 B. groenlandicus Poulsen, 1937 B. gunnari Fortey & Bruton, 2013 B. jeffersonensis Cullison, 1944 B. kindlei Boyce, 1989 B. stclairi Cullison, 1944 B. stevensi Boyce, 1989