The caterpillars are so-named for the prominent horny spike that protrudes up from the end of the abdomen, and the hornworm caterpillar most likely to be seen in the home garden in Maine is the tobacco hornworm, Manduca sexta. The larva is large, and thus it is relatively easy to dissect it and isolate its organs.Hornworms are the caterpillars of a family of moths called sphinx moths or hawk moths (Sphingidae). It can be easily raised on a wheat-germ based diet. It is used in a variety of biomedical and biological scientific experiments. sexta is a common model organism, especially in neurobiology, due to its easily accessible nervous system and short life cycle.
sexta has mechanisms for selectively sequestering and secreting the neurotoxin nicotine present in tobacco. A mnemonic to remember the markings is tobacco hornworms have straight white lines like cigarettes, while tomato hornworms have V-shaped markings. It can be distinguished by its seven diagonal lines on its sides tomato hornworms have eight V-shaped markings. The tobacco hornworm is sometimes kept as a pet by children throughout its range.
Commonly known as the tobacco hornworm and the goliath worm, it is closely related to and often confused with the very similar tomato hornworm the larvae of both feed on the foliage of various plants of the family Solanaceae. Manduca sexta Manduca sexta is a moth of the family Sphingidae present through much of the American continent.
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