A – head, B – thorax, C – abdomen, 1 – prothoracic shield, 2 – spiracle, 3 – true legs, 4 – midabdominal prolegs, 5 – anal proleg, 6 – anal plate, 7 – tentacle, a – eye, b – stemmata (ocelli), c – antenna, d – mandible, e – labrum, f – frontal triangle.
Caterpillar Morphology Diagram. Caterpillars Anatomy. Anatomy is a branch of the field of morphology. Morphology encompasses the internal and outward appearance of an organism (e.g., is shape, size, pattern) as well as the form and location of external and internal structures (e.g., bones and organs–anatomy). Anatomy is a “branch of morphology that deals with the structure of organisms”. Molecular morphology is a rarely used term, usually referring to the superstructure of polymers, such as fiber formation or larger composite assemblies. The term is commonly not applied to the spatial structure of individual molecules. Image by Michal Komorniczak is licensed under CC BY-SA 3.0