The family Thaumetopoeidae—the "processionary moths"—comprises about 100 species, of which three have been recorded in Great Britain:

• Thaumetopoea pityocampa, pine processionary — probably rare immigrant (otherwise imported)
• Thaumetopoea processionea, oak processionary — immigrant
• [Trichocercus sparshalli, local long-tailed satin — probably imported (Australian species)]