沙螨后中肠的精细结构

IF 1.7 3区 农林科学 Q2 ENTOMOLOGY Arthropod Structure & Development Pub Date : 2023-01-01 DOI:10.1016/j.asd.2022.101218
Svetlana Filimonova
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引用次数: 0

摘要

螨形目不同系统发育谱系中肠后区(PMG)的同源性尚未解决。在Trombidiformes目中,PMG的超微结构主要在衍生组中已知;因此,本研究的重点是属于一个相对基础的错倍体科的物种。百家虫的PMG由结肠和后结肠组成,由一个小的肋间结肠分隔。结肠和结肠后的精细结构与肌肽型螨相应器官的精细结构相似,上皮表现出吸收和内吞活性。上皮细胞在粪便周围产生各种排泄液泡和围生基质。更糟糕的是,后殖民地的上皮具有最高的顶端刷状边界,尤其是大量的线粒体,这表明它们参与了水和离子的吸收。结肠间的功能就像一个有上皮的括约肌,能够产生排泄颗粒。一对短的盲板延伸部分从隆间以非对称方式进入体腔。在超微结构上,这些延伸类似于蛛形纲马尔皮氏管,可能是它们的缩小型。在结肠和结肠后发现了罕见的内分泌样细胞。
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Fine structure of the posterior midgut in the mite Anystis baccarum (L.)

Homology of the posterior midgut regions (PMG) in different phylogenetic lineages of acariform mites (superorder Acariformes) remains unresolved. In the order Trombidiformes, the ultrastructure of the PMG is known primarily in derived groups; thus this study focuses on species belonging to a relatively basal trombidiform family.

PMG of Anystis baccarum consists of the colon and postcolon separated by a small intercolon. The fine structure of the colon and postcolon is close to that of the corresponding organs of sarcoptiform mites with the epithelium showing absorptive and endocytotic activity. The epithelial cells produce a variety of excretory vacuoles and a peritrophic matrix around the feces. Morover, the epithelium of the postcolon is characterized by the highest apical brush border and especially numerous mitochondria suggesting involvement in water and ion absorption. The intercolon functions as a sphincter lined with an epithelium capable of producing excretory granules. A pair of short blind extensions arises assimmetrically from the intercolon into the body cavity. Ultrastructurally, these extensions are similar to the arachnid Malpighian tubules and may be their reduced version. Rare endocrine-like cells have been observed in the colon and postcolon.

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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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