Background <p><i>Entomoscelis suturalis</i> is considered a pest. It’s a leaf-eating beetle that can damage crops like rapeseed, mustard, cabbage, and radish. The adults, in particular, are known to feed on these plants, causing significant damage. Understanding the internal anatomy of this pest, particularly the digestive and excretory systems, is essential for identifying potential physiological targets in pest management strategies.</p> Results <p>This study uses light and scanning electron microscopy to describe the morphology of the digestive and excretory systems of the leaf beetle, <i>E. suturalis</i>. A detailed understanding of these systems is crucial for developing effective pest control strategies. The beetle’s digestive tract comprises a foregut, midgut, and hindgut. The foregut consists of a pharynx, esophagus, crop, and proventriculus, all lined with a muscle layer, a thin epithelium, and an intima. The well-developed midgut is wrinkled due to large, deep folds in its columnar epithelial layer. The hindgut includes an ileum, colon, and rectum; its cell layers consist of an inner cuticular intima, an epithelial layer, and a muscle layer. The excretory system comprises two pairs of Malpighian tubules between the midgut and hindgut.</p> Conclusion <p>The detailed characterization of the digestive and excretory systems of <i>E. suturalis</i> offers critical insights into the functional anatomy of this destructive pest. These findings not only enrich the anatomical understanding of leaf beetles but also identify structural features that may serve as potential targets for pest control strategies and developing more precise approaches to <i>E. suturalis</i> management and other related crop pests.</p>