期刊
GEOLOGICAL MAGAZINE
卷 158, 期 7, 页码 1209-1223出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0016756820001259
关键词
Redlichiida; Redlichiidae; protaspid; meraspid; arthropod; early Cambrian
资金
- Australian Government Research Training Scheme (RTS) scholarship
- University of Adelaide
Studies on trilobite growth, especially at early developmental stages, play a critical role in understanding the phylogenetic relationships within this group of arthropods. The research in South Australia reveals important information about the ontogeny of Redlichia trilobites, highlighting morphological characteristics and potential phylogenetic signals during early growth stages within the Order Redlichiida.
Studies that reveal detailed information about trilobite growth, particularly early developmental stages, are crucial for improving our understanding of the phylogenetic relationships within this iconic group of fossil arthropods. Here we document an essentially complete ontogeny of the trilobite Redlichia cf. versabunda from the Cambrian Series 2 (late Stage 4) Ramsay Limestone of Yorke Peninsula in South Australia, including some of the best-preserved protaspides (the earliest biomineralized trilobite larval stage) known for any Cambrian trilobite. These protaspid stages exhibit similar morphological characteristics to many other taxa within the Suborder Redlichiina, especially to closely related species such as Metaredlichia cylindrica from the early Cambrian period of China. Morphological patterns observed across early developmental stages of different groups within the Order Redlichiida are discussed. Although redlichiine protaspides exhibit similar overall morphologies, certain ontogenetic characters within this suborder have potential phylogenetic signal, with different superfamilies characterized by unique trait combinations in these early growth stages.
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