Ultrastructure of the larval rectum of the scorpionfly Panorpa liui (Mecoptera: Panorpidae)

IF 1.7 3区 农林科学 Q2 ENTOMOLOGY
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引用次数: 0

Abstract

The rectum is an important part of the alimentary canal responsible for ion and water reabsorption of insects. However, it has rarely been studied in the larvae of Panorpidae, the largest family in Mecoptera. Here, we investigated the ultrastructure of larval rectum of the scorpionfly Panorpa liui Hua, 1997 using light and transmission electron microscopy. The rectum comprises tracheal muscular layers, connective tissue, non-cellular basal lamina, junctional cells, rectal epithelium, cuticle with irregular outlines, and a central lumen. The rectal epithelium is infolded to form six longitudinal rectal folds, which are distinct from rectal pads or papillae. In each rectal fold, the apical and basal plasma membranes of epithelial cells are infolded and the lateral plasma membranes form septate and scalariform junctions. The well-developed rectal folds are postulated to be closely associated with reabsorption of ions and water in the larvae. The associations of rectal folds with larval behaviors are briefly discussed in Mecoptera.

蝎蝇(Mecoptera: Panorpidae)幼虫直肠的超微结构。
直肠是消化道的重要组成部分,负责昆虫的离子和水分重吸收。然而,对鳞翅目昆虫中最大的科--蝎蝇科幼虫直肠的研究却很少。在此,我们利用光显微镜和透射电子显微镜研究了蝎蝇(Panorpa liui Hua,1997 年)幼虫直肠的超微结构。直肠由气管肌肉层、结缔组织、非细胞基底层、连接细胞、直肠上皮、轮廓不规则的角质层和中央管腔组成。直肠上皮内折形成六个纵向的直肠褶皱,与直肠垫或直肠乳头不同。在每个直肠褶皱中,上皮细胞的顶端和基底浆膜内折,外侧浆膜形成隔膜和鳞状连接。据推测,发达的直肠褶皱与幼虫重吸收离子和水分密切相关。直肠褶皱与幼虫行为的关系在《甲壳动物》中有简要论述。
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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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