Development of the early Cambrian oryctocephalid trilobite Oryctocarella duyunensis from western Hunan, China

Tao Dai, Nigel Hughes, Xingliang Zhang & Shanchi Peng
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 homonomously segmented trunk with variation in the number of pygidial...
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