A model to explain spermatophore implantation in cephalopods (Mollusca: Cephalopoda) and a discussion on its evolutionary origins and significance
A model to explain spermatophore implantation in cephalopods (Mollusca: Cephalopoda) and a discussion on its evolutionary origins and significance
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解释头足类动物精子植入的模型（软体动物：头足类）及其进化起源和意义的讨论
DOI：
10.1111/j.1095-8312.2011.01832.x
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发表时间：
2012
影响因子：
1.9
通讯作者：
J. Marian
中科院分区：
文献类型：
--
作者：
J. Marian
雄性胶状头足类动物产生的精囊可以在一个复杂的外泄过程中自主附着在雌性的身体上，这个过程被称为“精囊反应”，在这个过程中，射精器和精囊的螺旋丝被凸出并暴露在外部环境中。在一些深水头足类动物中，这种反应导致了精子包囊的皮内着床，这是一个迄今为止尚不清楚的现象。本研究建立在几条证据的基础上，提出精子的植入可能是通过以下两种因素的结合实现的：(1)由射精装置执行的“外泄管”机制和(2)螺旋细丝的星状粒子提供的锚定。所提出的理论模型假设，当它暴露于外部环境时，螺旋灯丝的每个螺旋都通过其锋利的星状颗粒锚定在周围的组织上。当射精器尖端继续外翻时，它的直径增大并纵向伸展，扩大了螺旋的直径并推动它，从而撕裂并推动锚定的组织向外和向后，并为下一个螺旋的附着打开空间。在射精器外翻并穿孔组织后，水泥体被挤出，可能有助于最终的附着，精子团进入女性组织内，被外翻的射精器管包围。我们认为这种独特的、高效的精子附着机制可能是与卵圆体采用一种主动的生活方式密切相关的。本文还讨论了捕食压力和精子竞争在这一机制进化中的可能作用。©2012伦敦林奈学会，林奈学会生物学杂志，2012,105,711-726。
Male coleoid cephalopods produce spermatophores that can attach autonomously on the female's body during a complex process of evagination called the ‘spermatophoric reaction’, during which the ejaculatory apparatus and spiral filament of the spermatophore are everted and exposed to the external milieu. In some deepwater cephalopods, the reaction leads to the intradermal implantation of the spermatophore, a hitherto enigmatic phenomenon. The present study builds upon several lines of evidence to propose that spermatophore implantation is probably achieved through the combination of (1) an ‘evaginating-tube’ mechanism performed by the everting ejaculatory apparatus and (2) the anchorage provided by the spiral filament's stellate particles. The proposed theoretical model assumes that, as it is exposed to the external milieu, each whorl of the spiral filament anchors to the surrounding tissue by means of its sharp stellate particles. As the ejaculatory apparatus tip continues evaginating, it grows in diameter and stretches lengthwise, enlarging the diameter of the whorl and propelling it, consequently tearing and pushing the anchored tissue outward and backward, and opening space for the next whorl to attach. After the ejaculatory apparatus has been everted and has perforated tissue, the cement body is extruded, possibly aiding in final attachment, and the sperm mass comes to lie inside the female tissue, encompassed by the everted ejaculatory apparatus tube. It is proposed that this unique, efficient spermatophore attachment mechanism possibly evolved in intimate relationship with the adoption of an active mode of life by coleoids. The possible roles of predation pressure and sperm competition in the evolution of this mechanism are also discussed. © 2012 The Linnean Society of London, Biological Journal of the Linnean Society, 2012, 105, 711–726.
Loligo bleekeri 鱿鱼射精特征的阈值二态性
DOI：
--
发表时间：
2007
期刊：
Marine Ecology Progress Series 345
影响因子：
--
作者：
Yoko Iwata;Yasunori Sakurai
通讯作者：
Yasunori Sakurai