Bathynotus

Bathynotus is a genus of trilobites of the family Bathynotidae. Its fossils have been found in the paleocontinents Laurentia (specifically in what are now Nevada and Vermont), Gondwana (in South China and South-Australia), and - doubtfully - Siberia. It is characterized by a very wide axis in the thorax and an enlarged 11th segment that bears a long, backwardly directed spine on each side. Additionally, the 12th and 13th segments are narrow and fuse with the edge of the spine of the 11th segment.^[2]

Bathynotus Temporal range: 517 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓ late Botomian
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Trilobita
Order:	Redlichiida
Suborder:	Bathynotina
Family:	Bathynotidae
Genus:	Bathynotus Hall, 1860.[1][2]
Species
B. holopygus (Hall, 1859) (Type)[3] B. elongatus Zhao, Gong & Wang, 1987[2] B. kueichouensis Lu in Wang et al, 1964[2]

Etymology

Bathynotus is derived from the Greek words βαθυς -bathus- meaning "ample"; and νοτος -notos- meaning "back", for the very wide axis of the thorax. The species names are derived as follows.

• elongatus means lengthened, for the greater body length of this species.
• holopygus means entire shield, for the pygidium that has a smooth border.
• kueichoensis comes from Kweichow (now Guizhou Province) in China where this species was collected.