Explanation

Even when a mark on a plant fossil can confidently be interpreted as a feeding trace, identifying the maker to the species level is usually not possible. Potential producers include not only insects, but also mites, myriapods such as millipedes, and even fungi or bacteria. Moreover, the range of possible culprits changes through time as animal groups evolve and become extinct.

That said, certain types of damage, especially some leaf mines and galls, can be more diagnostic. In these cases, the behavior and feeding patterns differ among lineages, and comparisons with modern examples sometimes allow researchers to narrow the maker down to a particular family or even genus.

For example, serpentine leaf mines that widen gradually as the larva grows are characteristic of some gracillariid moths. Similarly, distinctive blotch mines with a central frass trail may point to certain dipteran families. In rare cases where the mine structure, frass pattern, and host-plant association closely match a living lineage, the producer can be inferred to a modern genus with reasonable confidence.