Light Microscopic Observations Of The Mesentero-Proctodeal Regions In Adult Catopsilla Pomona (Fabricius, 1758) (Lepidoptera: Pieridae)

The aim of this study was to examine the basic histological structure of the mesentero-proctodeal regions (midgut and hindgut) of Catopsilia pomona (Fabricius, 1758) which were living in their natural habitat in the northern part of Thailand. All specimens were processed by the standard histological technique. Each section was cut at 6 micrometers and stained with Harris's haematoxylin and eosin. For the longitudinal sections, the results revealed that the structural wall in both the midgut and hindgut could be divided obviously into 4 layers: the mucosa, submucasa, muscularis, and serosa, respectively. The midgut was mainly shown to be 2 types of epithelial cells, based on histological localization: (i) a simple columnar epithelium and (ii) a simple cuboidal epithelium. The hindgut was classified distinctly into 2 subparts: the ilium and the rectum. The ilium was a simple squamous epithelium, whereas the rectum was a simple squamous epithelium with 5-6 rectal papillae. The results of this study showed the details of the histology of the mesentero-proctodeal regions and are considered the first such report in Thailand.