Reproductive strategy of the bradoriid arthropod Kunmingella douvillei from the Lower Cambrian Chengjiang Lagerstatte, South China
Reproductive strategy of the bradoriid arthropod Kunmingella douvillei from the Lower Cambrian Chengjiang Lagerstatte, South China
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DOI：
10.1016/j.gr.2013.03.011
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发表时间：
2014-04-01
影响因子：
6.1
通讯作者：
Shu, Degan
中科院分区：
文献类型：
--
作者：
Duan, Yanhong;Han, Jian;Shu, Degan
双瓣慢足节肢动物Kunmingella douvillei （Mansuy, 1912）是下寒武统澄江盆地最常见的物种。根据保存完好的标本报道了其软解剖结构。然而，与其他寒武纪节肢动物一样，它的繁殖行为记录很少。报道了一些罕见的带卵保存标本。我们的新藏品证实了这些卵直接附着在最后三对双名附属物上，并验证了先前工作提出的头干边界。与现存的甲壳类动物一样，杜氏K. douvillei的产卵行为很可能与它的小体型有关。杜氏夜蛾雌虫可产卵50 ~ 80枚，卵直径150 ~ 180 μ m，可能为k -生殖策略；它的个体发生和繁殖模式可能是为了应对埃迪卡拉-寒武纪边界日益增加的掠食压力而做出的适应。现存海洋无脊椎动物生活史上的三个主要发展方向，即浮游营养型幼虫、电营养型幼虫和育雏，都很可能是在寒武纪第三阶段进化出来的。(C)， 2013国际冈瓦纳研究协会。Elsevier BM出版。版权所有。
The bivalved bradoriid arthropod Kunmingella douvillei (Mansuy, 1912) is the most common species in the Lower Cambrian Chengjiang Lagerstatte. 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 mu 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. (C), 2013 International Association for Gondwana Research. Published by Elsevier BM. All rights reserved.