Children (13 direct children, 13 direct and indirect children):
Thamnophis sirtalis sirtalis
Eastern garter snake
Thamnophis sirtalis similis
Thamnophis sirtalis infernalis
California red-sided garter snake
San francisco garter snake
Thamnophis sirtalis tetrataenia
Thamnophis sirtalis fitchi
Chicago garter snake
Thamnophis sirtalis semifasciatus
Texas garter snake
Thamnophis sirtalis annectens
Thamnophis sirtalis parietalis
Puget sound garter snake
Thamnophis sirtalis lowei
Red-spotted garter snake
Thamnophis sirtalis pallidulus
Thamnophis sirtalis dorsalis