Species: chattertoni SOEHN & WILSON, 1990
Etymology: In honor of the collector Dr. Brian D. E. Chatterton.
Holotype: UALVP 15682
Locality: From beds 515 m in section AV1 of Over and Chatterton, Mackenzie Mountains, Northwest Territories Province, Canada.
Horizon: Unit 1R, Delorme Group.
Biostratigraphy:
Age: Early Wenlockian Epoch, Early Middle Silurian.
Material: Complete articulated specimen.
Referred material:
UALVP 15683, 29663: 2 nearly complete specimens exposed in dorsal view on a single small slab.
UALVP 15679, 29964: 2 partial, articulated specimens ind dorsal view on a singl slap.
UALVP 15681: A aprtial, articualted specimen in dorsal view, with fragments of 5 other individuals (UALVP 29965-8).
UALVP 15680: An articualted anteriorhalf of an indifivual with ventral shield and curshed oral area exposed.
UALVP 28216: An articualted individual in dorsal view, lackign the anteriror and posterior extremities.
UALVP 29926: Complete individual with its anterior half, including ventral shield and crushed oral area, exposed.