臭腹腺蝗(直翅目:锥头蝗科)消化道对食物储存、消化 和吸收相适应的显微结构(英文)  

Microstructural adaptation of Zonocerus variegates (L.) (Orthoptera: Pyrgomorphidae) gut for food storage, digestion and absorption

作　　者：Bassey E. AKPAN Tony G. OKORIE 

机构地区：[1]Deapartment of Zoology, University of Uyo, Uyo, Nigeria,Department of Zoology, University of Ibandan, Ibandan, Nigeria

出　　处：《昆虫学报》2005年第3期325-330,共6页Acta Entomologica Sinica

摘　　要：显微观察发现臭腹腺蝗Zonocerusvariegatus(直翅目:锥头蝗科)嗉囊、中肠和后肠的肠壁结构有所不同。嗉囊为空时纵向折叠。中肠上皮层的厚度随龄期有明显变化,1龄和2龄时明显大于3龄、4龄和5龄。后肠具有帮助消化和吸收的功能。Micromorphological examination of the gut wall of Zonocerus variegatus has shown variations in the wall structure of the crop, midgut and hindgut. The crop is folded longitudinally when empty. It is lined luminally by a cuticular layer. Behind this layer there are small polyhedral cells made into clusters by the longitudinal fold. Three to five fat bundles of striated muscles surround the crop. The midgut which consists of anterior gastric caeca, posterior gastric caeca and ventriculus is cuticle free. Its epithelium is of columnar cells with brush borders. The midgut cells were classified into regenerative, young, resting, extruding and erupting cells depending on the characteristics of their nuclei. The resting cells were the most abundant (42.59%). Anterior gastric caeca, posterior gastric caeca and ventriculus had similar cells. There was a significant difference in the thickness of the epithelia of the six nymphal stages (P<0.05), being thinner at first and second instar nymphs than third, fourth and fifth. The mean thickness of epithelia of sixth instar nymphs observed at 2 day intervals were the same. The hindgut has cuticular layer too, but the underlying epithelium is of columnar cells. The hindgut cells are therefore presumed to help in digestion and absorption of food. Storage, digestive and absorptive functions performed in the pre_hindgut region are suggested to be summarised by the hindgut activities.

关 键 词：臭腹腺蝗 消化道 显微结构适应 食物储存 消化 吸收 

分 类 号：Q965[生物学—昆虫学]