蜘蛛蟹(Maja brachydactyla Balss)幼虫中肠和中肠-后肠连接的形态学描述,1922 (malacostrae:十足目)

IF 1.7 3区 农林科学 Q2 ENTOMOLOGY Arthropod Structure & Development Pub Date : 2022-09-01 DOI:10.1016/j.asd.2022.101168
Diego Castejón , Guiomar Rotllant , Enric Ribes , Guillermo Guerao
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引用次数: 0

摘要

十足动物的中肠是一个消化器官,参与营养膜的合成、食物运输、营养物质的吸收和渗透调节。已详细描述了成年十足动物的中肠,但关于幼虫期中肠的形态和超微结构的信息很少。本研究使用解剖、光学显微镜和电子显微镜等技术描述了普通蜘蛛蟹(Maja brachydactyla Balss, 1922)幼虫的中肠和中肠-后肠连接处。研究主要集中在小虫期和大虫期。本研究的结果表明,幼虫的中肠是位于胃和后肠之间的一条短而简单的管道。在幼虫发育过程中,中肠最大长度显著增加,但最大直径和器官形态特征均无显著差异。中肠在孵化后至少约12小时是活跃的,这表明管腔内存在营养膜,细胞顶端存在丰富的电致密囊泡,以及囊泡内容物在器官管腔上的释放。中肠-后肠连接在中肠和后肠之间形成一个突变,其中没有出现具有中肠和后肠混合特征的上皮细胞。
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Morphological description of the midgut tract and midgut–hindgut junction in the larvae of the spider crab Maja brachydactyla Balss, 1922 (Malacostraca: Decapoda)

The midgut tract of decapods is a digestive organ involved in the synthesis of peritrophic membrane, food transport, absorption of nutrients, and osmoregulation. The midgut tract has been described in detail in adult decapods, but little information is available regarding the morphology and ultrastructure of the midgut tract in larval stages. The present study describes the midgut tract and the midgut–hindgut junction of the larvae of the common spider crab Maja brachydactyla Balss, 1922 using techniques that included dissection, light microscopy, and electron microscopy. The study is mainly focused on the stages of zoea I and megalopa. The results obtained in this study show that the larval midgut tract is a short and simple tube positioned anteriorly, between the stomach and the hindgut tract. During larval development, the maximum length of the midgut tract increases significantly, but no differences were found on either the maximum diameter or the morphological traits of the organ. The midgut tract is active at least ca. 12 h after hatching, as suggested by the presence of the peritrophic membrane in the lumen, the presence of abundant electro-dense vesicles in the cell apex, and the release of the vesicle content on the organ lumen. The midgut–hindgut junction forms an abrupt transition between the midgut tract and the hindgut tract in which epithelial cells with mixed features of midgut and hindgut do not occur.

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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.
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