Translator Disclaimer
17 June 2021 Development of the early Cambrian oryctocephalid trilobite Oryctocarella duyunensis from western Hunan, China
Tao Dai, Nigel C. Hughes, Xingliang Zhang, Shanchi Peng
Author Affiliations +
Abstract

Abundant articulated specimens of the oryctocarine trilobite Oryctocarella duyunensis from the lower Cambrian (Stage 4, Series 2) Balang Formation at the Bulin section in western Hunan Province, South China, permit the description of all meraspid degrees. The maximum number of thoracic segments observed in this collection is 11. Meraspid growth was accompanied by progressive and gradual change in overall form, and this animal showed an homonymously segmented trunk with variation in the number of pygidial segments during ontogeny. Such variation permits a variety of plausible explanations, but a model of successive instars defined by the number of thoracic segments, and in suborder by the number of pygidial segments, is highly unlikely to explain the growth pattern because it would result in the loss of trunk segments between some instars. Degree-based ontogenetic staging is compatible with the variation observed.

Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Paleontological Society
Tao Dai, Nigel C. Hughes, Xingliang Zhang, and Shanchi Peng "Development of the early Cambrian oryctocephalid trilobite Oryctocarella duyunensis from western Hunan, China," Journal of Paleontology 95(4), 777-792, (17 June 2021). https://doi.org/10.1017/jpa.2020.111
Accepted: 1 December 2020; Published: 17 June 2021
JOURNAL ARTICLE
16 PAGES


SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top