八点广翅蜡蝉成虫消化道和马氏管整体形态及超微结构OA

[Objectives]The study aims to elucidate the overall morphology and ultrastructure of the ali-mentary canal and Malpighian tubules of adult Ricania speculum,so as to provide reference for the research on morphological differentiation of alimentary canal and Malpighian tubules as well as the phylogeny of Fulgoromor-pha.[Method]The overall morphology of alimentary canal and Malpighian tubules,and ultrastructure of associ-ated organs of R.speculum were observed by using light and electron microscopy.[Result]The alimentary canal of R.speculum is composed of oesophagus,anterior diverticulum,midgut and hindgut.From the outside to the in-side,the oesophagus consists of a muscle layer,a epithelial cell layer and a stratum corneum.The anterior diver-ticulum originated from the end of the oesophagus and is composed of a outer muscle layer and an inner epithelial cell layer.And the epithelial cell layer contains digestive,regenerative and endocrine cells.The midgut is slender and highly coiled,and is divided into three distinct regions:the anterior midgut,the mid-midgut,and the poste-rior midgut.In the anterior midgut,the epithelial cells contain numerous mitochondria and secretory vesicles.In the mid-midgut,the apical microvilli of the epithelial cells are sparse,lipid granules can be seen at the base,and a large number of spherites can be observed in the cytoplasm.In the posterior midgut,the epithelial cells contain numerous secretory vesicles and visible endocrine cells.The hindgut is mainly composed of the rectum,with the ileum being extremely short,and its tissue structures are similar to those of the oesophagus.And its apical plasma membranes of the rectal epithelial cells are specialized into leaflets.The Malpighian tubules of R.specu-lum are divided into two regions:the proximal end and the distal end.The proximal epithelial cells contain nu-merous low-electron density vacuoles.The distal epithelial cells contain numerous spherites,and the top of mi-crovilli both are covered with numerous vacuoles.[Conclusion]The morphological structure of the alimentary canal and Malpighian tubules of R.speculum are similar to those of the species reported as Fulgoridae,but an electron transparent vacuolar layer is observed on the surface of the microvilli of the epithelial cells of Malpighian tubules in R.speculum.Microbial aggregation is also observed in the alimentary canal(except oesophagus)and Malpighian tubules of R.speculum.The internal organs and systematic morphology can provide important basis for the phylogeny of higher classification of the infraorder Fulgoromorpha.