Ultrastructure of the female pedal gonad in Phoxichilidium femoratum (Chelicerata, Pycnogonida)

IF 1.7 3区 农林科学 Q2 ENTOMOLOGY Arthropod Structure & Development Pub Date : 2023-09-01 DOI:10.1016/j.asd.2023.101295
Nina Alexeeva , Yuta Tamberg
{"title":"Ultrastructure of the female pedal gonad in Phoxichilidium femoratum (Chelicerata, Pycnogonida)","authors":"Nina Alexeeva ,&nbsp;Yuta Tamberg","doi":"10.1016/j.asd.2023.101295","DOIUrl":null,"url":null,"abstract":"<div><p><em>Phoxichilidium femoratum</em><span><span> is a common species of sea spiders – a small and unique group of </span>chelicerates<span><span> with unusual adult anatomy. In particular, substantial parts of the reproductive system in pycnogonids (unlike euchelicerates) are located in the appendages. Existing studies of pycnogonid gonads are often limited to light-microscopic level, cover a small range of species, and focus on the contents of the gonad diverticula. Ultrastructural data are rare and contradictory, and the organisation of the gonad wall and the gonoducts is unknown. Here we present a detailed light and transmission electron microscopy-based examination of the pedal portion of the adult </span>female reproductive system in </span></span><em>Phoxichilidium femoratum</em><span><span> Rathke, 1799. We describe its gross anatomy and the ultrastructure of the gonad diverticulum, oviduct<span> and gonopore, as well as development of the oocytes. Each gonad diverticulum is enclosed in the </span></span>extracellular matrix<span> of the horizontal septum and bears some internal cellular lining. However, neither the gonad lining, nor the septum sheath cells, ever form a continuous epithelial layer. Oocytes, which undergo maturation in the diverticulum, remain, until very late in the process, attached to the gonad wall though specialised stalk cells. Interestingly, stalk cells do not participate in egg envelope or yolk formation<span>: both are synthesized endogenously in the oocytes. The oviduct is supplied with musculature, which assists in egg transport to the gonopore, whereas the gonopore itself is surrounded by specialised glands.</span></span></span></p></div>","PeriodicalId":55461,"journal":{"name":"Arthropod Structure & Development","volume":null,"pages":null},"PeriodicalIF":1.7000,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Arthropod Structure & Development","FirstCategoryId":"97","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1467803923000622","RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENTOMOLOGY","Score":null,"Total":0}
引用次数: 0

Abstract

Phoxichilidium femoratum is a common species of sea spiders – a small and unique group of chelicerates with unusual adult anatomy. In particular, substantial parts of the reproductive system in pycnogonids (unlike euchelicerates) are located in the appendages. Existing studies of pycnogonid gonads are often limited to light-microscopic level, cover a small range of species, and focus on the contents of the gonad diverticula. Ultrastructural data are rare and contradictory, and the organisation of the gonad wall and the gonoducts is unknown. Here we present a detailed light and transmission electron microscopy-based examination of the pedal portion of the adult female reproductive system in Phoxichilidium femoratum Rathke, 1799. We describe its gross anatomy and the ultrastructure of the gonad diverticulum, oviduct and gonopore, as well as development of the oocytes. Each gonad diverticulum is enclosed in the extracellular matrix of the horizontal septum and bears some internal cellular lining. However, neither the gonad lining, nor the septum sheath cells, ever form a continuous epithelial layer. Oocytes, which undergo maturation in the diverticulum, remain, until very late in the process, attached to the gonad wall though specialised stalk cells. Interestingly, stalk cells do not participate in egg envelope or yolk formation: both are synthesized endogenously in the oocytes. The oviduct is supplied with musculature, which assists in egg transport to the gonopore, whereas the gonopore itself is surrounded by specialised glands.

Abstract Image

查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
蛇床虫雌性踏板性腺的超微结构。
femoratum Phoxichilidium是一种常见的海蜘蛛,是一种小型而独特的螯肢动物,具有不同寻常的成年解剖结构。特别是,固孔动物(与真螺旋动物不同)生殖系统的大部分位于附肢中。现有的对比重瓶性腺的研究通常局限于光镜水平,覆盖的物种范围很小,并集中在性腺憩室的内容物上。超微结构数据很少且相互矛盾,性腺壁和生殖产物的组织也不清楚。在这里,我们介绍了1799年在Phoxichilidium femoratum Rathke对成年雌性生殖系统踏板部分进行的详细的光学和透射电子显微镜检查。我们描述了它的大体解剖、性腺憩室、输卵管和性腺孔的超微结构,以及卵母细胞的发育。每个性腺憩室都被包裹在水平隔膜的细胞外基质中,并带有一些内部细胞内衬。然而,性腺衬里和隔膜鞘细胞都不会形成连续的上皮层。卵母细胞在憩室中成熟,通过专门的茎细胞附着在性腺壁上,直到这个过程的很晚。有趣的是,柄细胞不参与卵囊或卵黄的形成:两者都是在卵母细胞中内源性合成的。输卵管由肌肉组织提供,帮助卵子运输到生殖孔,而生殖孔本身由专门的腺体包围。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
CiteScore
3.50
自引率
10.00%
发文量
54
审稿时长
60 days
期刊介绍: Arthropod Structure & Development is a Journal of Arthropod Structural Biology, Development, and Functional Morphology; it considers manuscripts that deal with micro- and neuroanatomy, development, biomechanics, organogenesis in particular under comparative and evolutionary aspects but not merely taxonomic papers. The aim of the journal is to publish papers in the areas of functional and comparative anatomy and development, with an emphasis on the role of cellular organization in organ function. The journal will also publish papers on organogenisis, embryonic and postembryonic development, and organ or tissue regeneration and repair. Manuscripts dealing with comparative and evolutionary aspects of microanatomy and development are encouraged.
期刊最新文献
Cuticle ultrastructure of the Early Devonian trigonotarbid arachnid Palaeocharinus Evolution of and structures involved in wing folding in featherwing beetles (Coleoptera: Ptiliidae) Morphology of lecithotrophic postlarvae of genus Austropallene (Arthropoda: Chelicerata) with some notes on reproductive strategy The eyestalk photophore of Northern krill Meganyctiphanes norvegica (M. Sars) (Euphausiacea) re-investigated: Innervation by specialized ommatidia of the compound eye Outside Front Cover
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1