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首页> 外文期刊>Biology Bulletin >Morphology of Genital System and Reproductive Biology of the Arctic Calanoid Copepod Metridia longa
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Morphology of Genital System and Reproductive Biology of the Arctic Calanoid Copepod Metridia longa

机译：北极Calanoid Copepod Metridia longa生殖系统的形态和生殖生物学

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摘要

This paper considers features of the external morphology and internal structure of the genital system of adult males and females of Metridia longa Lubbock from the White Sea, as well as related with them features of reproduction biology of this mass Arctic copepod. Males of M. longa are dimorphically asymmetric. In the population, there are two morphotypes, which are mirror images of each other. Asymmetry manifests in them as the presence of a right (males "righties") or left (males "lefties") geniculate antenna, structure of the fifth pair of swimming legs, and location of an unpaired gonad and genital opening. The relative position of these structures is linked together. In females, there are two widely spaced copulator pores that lead to the two spermathe-cae not connected to each other. The latter, in turn, are connected to two gonopores, through which shedding of eggs occurs. The vast majority of the females in the studied population M. longa in all seasons of the year had only one filled spermatheca, either the right or the left. The females with bilateral insemination also occurred, but did not exceed 2.7% of all specimens. The ratio of females with the right and left filled spermathecae and "right-handed" and "left-handed" males suggests that the male morphotype determines in which spermathecae male gonads are most likely to get into. The presence of females with two filled spermathecae implicates insemination by two males of different morphotypes. Since each spermatheca is connected to only one of the two oviducts, it is assumed that a half of the eggs produced by unilateral inseminated females remains not fertilized. The morphology of genital structures and literature data on the egg production of M. longa indicate that almost a half of eggs produced by females is not viable and thus wasted.
机译：本文考虑了来自白海的Metridia longa Lubbock的成年雌雄成体的生殖系统的外部形态和内部结构特征，以及与它们相关的北极co足类生殖生物学特征。长枝支原体的雄性是双态不对称的。在种群中，有两种形态型，它们是彼此的镜像。其中不对称表现为右（雄性“右撇子”）或左（雄性“左撇子”）膝状触角，第五对游泳腿的结构以及未配对的性腺和生殖器开口的位置。这些结构的相对位置链接在一起。在雌性中，有两个相距较远的交配器毛孔，这些毛孔导致两个未连接的精子囊。后者又与两个线孔相连，通过它发生卵的脱落。在所研究的种群中，龙眼分枝杆菌的绝大多数雌虫在一年中的所有季节都只有一个充满的精子，右侧或左侧。发生了双侧受精的女性，但未超过所有标本的2.7％。雌性和雌性的填充物分别为右和左，雄性为“右撇子”和“左撇子”的比例表明，雄性形态决定了哪种性腺最容易进入哪个性腺。具有两个充满精子的雌性动物的存在暗示着两个不同形态型的雄性受精。由于每个精子只与两个输卵管之一相连，因此可以认为，单侧受精雌性产生的卵中有一半仍未受精。生殖结构的形态学和有关长叶产卵子产卵的文献数据表明，雌性产卵中几乎有一半是不可行的，因此被浪费掉了。

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