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首页> 外文期刊>Journal of Molluscan Studies >Sperm ultrastructure in the ocean quahog Arctica islandica (Arcticidae) and Neotrapezium sublaevigatum (Trapezidae), with a discussion of relationships within the Arcticoidea and with other Euheterodonta (Bivalvia)
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Sperm ultrastructure in the ocean quahog Arctica islandica (Arcticidae) and Neotrapezium sublaevigatum (Trapezidae), with a discussion of relationships within the Arcticoidea and with other Euheterodonta (Bivalvia)

机译：海洋Quahog Arctica Islandica（arcticidae）和新甲基嗪（Trapezidae）的精子超微结构，并讨论了氨基替昔味区内的关系和其他Euheterodonta（Bivalvia）

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摘要

Sperm ultrastructure is described for the ocean quahog Arctica islandica (Linnaeus, 1767) (Arcticidae), a longlived, and commercially and phylogenetically important marine bivalve from the North Atlantic, and for Neotrapezium sublaevigatum (Lamarck, 1819), an Indo-Pacific member of the only other family of Arcticoidea (Trapezidae). Spermatozoa of A. islandica consist of (in anterior to posterior sequence): an elongateconical, deeply invaginated, acrosomal vesicle (length 2.0 +/- 0.2 mu m; invagination occupied by a granular subacrosomal material); a straight, anteriorly-tapered, rod-shaped nucleus (length 6.6 +/- 0.4 mu m); a short (approximately 0.8 mu m) midpiece consisting of two orthogonally arranged centrioles, surrounded by four (approximately 75% of spermatozoa observed) or, less commonly, five (approximately 25% of spermatozoa observed) spherical mitochondria; nine satellite fibres connecting the distal centriole to mitochondria and the plasma membrane; and a flagellum (length 60 +/- 5.0 mu m, with 9+2 axoneme), originating from the distal centriole. Contents of the acrosomal vesicle of A. islandica are differentiated into a very electron-dense basal ring (with reticulate structure) and two less electron-dense zones. Spermatozoa of N. laevigatum (Lamarck, 1819) differ substantially from those of A. islandica and are characterized by: a rounded-conical, deeply invaginated, acrosomal vesicle (length 0.43 +/- 0.2 mu m), with a curved basal ring and two less conspicuous components; a barrel-shaped nucleus (length 1.6 +/- 0.5 mu m) with a broad apical depression accommodating the base of the acrosomal vesicle; a midpiece composed of five (approximately 80% of spermatozoa observed) or four (approximately 20% of spermatozoa observed) mitochondria. Centriolar and flagellar details are essentially as for A. islandica, and putative glycogen deposits are associated with the distal centriole and mitochondria in both species. Sperm data corroborate recent transcriptomic analyses separating Arcticidae and Trapezidae in different imparidentian clades. Based on sperm morphology, A. islandica would appear more closely related to the Glauconomidae of the Cyrenoidea than to the Trapezidae, Veneroidea or any other previously examined group of euheterodonts, suggesting that it could be the only living member of the Arcticoidea. The relationships of the Trapezidae remain uncertain, with apparent sperm similarities to members of several groups of euheterodonts (e.g. Tellinoidea, Pholadoidea, Galeommatoidea), while several potentially closely related key taxa (e.g. Glossidae) remain unstudied for sperm characters.
机译：来自北大西洋的海洋Quahog Arctica Islancica（Linnaeus，1767），龙期和商业和文中的重要的海洋双向散蝇和肾小耳素羚羊（Lamarck，1819），是北大西洋的唯一的其他arctiCoidea（梯形）。 A. Islandica的精子包括（在前后序列中）：一种绵延，深刻的诱人的肌肤囊泡（长度为2.0 +/- 0.2 mu m;由粒状亚孕骨材料占用的内部侵入）;直的，前锥形，杆状核（长度为6.6 +/- 0.4 mu m）;由两个正交排列的半硅烷组成的短（约0.8μm）的中间件，包围四个（观察到的大约75％的精子）或不太常见的五（约25％的精子观察到的）球形线粒体;九颗卫星纤维将远端厘氢纤维连接到线粒体和质膜;和鞭毛（长度60 +/- 5.0 mu m，含有9 + 2轴的轴颈），来自远端厘里。 A. AssemaIs的含量的含量与非常电子 - 密集的基底环（具有网状结构）和两个较少的电子密集区域的含量。 N. Laevigatum（Lamarck，1819）的精子基本上不同于A.艾丽西巴的差异两个少于显眼的组件;筒状核（长1.6 +/-0.5μm），具有宽的顶端凹陷，其容纳仿毒剂囊泡的底部;由五个（观察到的大约80％的精子）或四个（约20％的精子观察到）线粒体组成的中间件。 CentRiolar和鞭毛细节本质上是A. Islandica和推定的糖原沉积物与两种物种中的远端厘氢和线粒体有关。精子数据证实最近的转录组分析分离在不同的仿真成立者中分离arcticidae和trapeidae。基于精子形态，A.艾丽西岛显得比Cyrenoidea的Glaucomidae更密切，而不是Trapezidae，Veneroidea或任何其他先前检查的Euheterodonts群体，这表明它可能是氨基替昔饼的唯一生活成员。 Trapezidae的关系仍然不确定，对于几组Euheterodonts（例如Tellinoidea，Pholadoidea，Galeommatoidea）的表达精子相似，而几种可能密切相关的关键分类群（例如Glossidae）对精子特征仍然不孤立。

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  • 来源
    《Journal of Molluscan Studies》 |2020年第3期|共13页
  • 作者

    Healy John M.; Mikkelsen Paula M.; Bieler Ruediger;

  • 作者单位

    Queensland Museum Biodivers &

    Geosci Program POB 3300 South Brisbane Bc Qld 4101 Australia;

    Field Museum Nat Hist Integrat Res Ctr 1400 S Lake Shore Chicago IL 60605 USA;

    Field Museum Nat Hist Integrat Res Ctr 1400 S Lake Shore Chicago IL 60605 USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 动物学;
  • 关键词

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