N.H. Admin. Code § Env-Wt 104.15
"Secondary vernal pool indicators" means physical evidence used by wildlife biologists or certified wetland scientists who are familiar with vernal pool habitats as evidence of the presence of a vernal pool, if primary vernal pool indicators are absent and other vernal pool characteristics suggest vernal pool habitat. Secondary vernal pool indicators include but are not limited to caddisfly larvae and cases (Limnephilidae, Phryganeidae, or Polycentropodidae), clam shrimp and their shells (Laevicaudata, Spinicaudata), fingernail clams and their shells (Sphaeriidae), aquatic beetle larvae (Dytiscidae, Gyrinidae, Haliplidae, and Hydrophilidae), dragonfly larvae and exuviae (Aeshnidae, Libellulidae), spire-shaped snails and their shells (Physidae, Lymnaeidae), flat spire snails and their shells (Planorbidae), damselfly larvae and exuviae (Coenagrionidae, Lestidae), and truefly larvae and pupae (Culicidae, Chaoboridae, and Chironomidae), and those identified in the third edition of "Identifying and Documenting Vernal Pools in New Hampshire" published by NHF & G, available at https://wildlife.state.nh.us/nongame/documents/vernal-pool-manual.pdf and as noted in Appendix B.
N.H. Admin. Code § Env-Wt 104.15