Reproductive strategy of the bradoriid arthropod Kunmingella douvillei from the Lower Cambrian Chengjiang Lagerst盲tte, South China

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• 作者：Yanhong Duan ; Jian Han ; Dongjing Fu ; Xingliang Zhang ; Xiaoguang Yang ; Tsuyoshi Komiya ; Degan Shu
• 关键词：Bradoriids ; Kunmingella ; Egg-bearing ; Reproductive strategy ; Qiongzhusian
• 刊名：Gondwana Research
• 出版年：April, 2014
• 年：2014
• 卷：25
• 期：3
• 页码：983-990
• 全文大小：2043 K

文摘

The bivalved bradoriid arthropod Kunmingella douvillei () is the most common species in the Lower Cambrian Chengjiang Lagerst盲tte. Its soft anatomy has been reported based on well-preserved specimens. However, as with other Cambrian arthropods, its reproductive behavior is poorly documented. Rare specimens of K. douvillei preserved with eggs have been reported. Our new collections confirm that the eggs were directly attached to the last three pairs of biramous appendages and verify the head-trunk boundary suggested by previous work. The brooding behavior of K. douvillei was most probably related to its small body size, as in living crustaceans. The K. douvillei female could carry 50-80 eggs ranging from 150-180 渭m in diameter, possibly indicating a K-reproductive strategy; its ontogenetic and reproductive mode might have been an adaptation in response to increasing predatory pressure across the Ediacaran-Cambrian boundary. All of the three main directions of development in the life history of living marine invertebrates, namely planktotrophic larvae, lecithotrophic larvae, and brood care, most likely evolved by Stage 3 of the Cambrian.