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Ontogeny of the redlichiid trilobite Metaredlichia cylindrica from the lower Cambrian (Stage 3) of South China

Published online by Cambridge University Press:  20 May 2016

Tao Dai  and
Xingliang Zhang
Tao Dai
Affiliation:
State Key Laboratory for Continental Dynamics, Early Life Institute and Department of Geology, Northwest University, Xian, 710069, China,
Xingliang Zhang
Affiliation:
State Key Laboratory for Continental Dynamics, Early Life Institute and Department of Geology, Northwest University, Xian, 710069, China,
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Abstract

A number of immature and mature exoskeletons allow the first detailed description of the ontogeny of the early Cambrian redlichiid trilobite Metaredlichia cylindrica, from black shale of the Shuijingtuo Formation in Hubei Province, South China. The material includes numerous complete protaspides, within which two stages can be differentiated according to the appearance of a shallow furrow that separates the protopygidial area from the protocranidium. Also, identification of the subsequent ontogenetic stages, including meraspides and holaspides, depends on isolated cranidia that display prominent morphological changes such as the contraction of frontal glabellar lobe, appearance of the fourth pair of glabellar furrows, and modification of the facial suture from proparian to opisthoparian. Incorporating the whole ontogenetic sequence allows us not only to trace the developmental trends of various structures with growth, but also to assign the protaspides to their adults correctly, particularly with the help of meraspid specimens.

Type
Research Article
Information
Journal of Paleontology , Volume 86 , Issue 4 , July 2012 , pp. 646 - 651
Copyright
Copyright © The Paleontological Society 

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