Jerarquía taxonómica:
Ichneumonidae → Gambrus ultimus Cresson, 1864

Familia:
Ichneumonidae

Autor:
Cresson, 1864

Sinónimos:
Agrothereutes (Allocryptus) hyslopi Viereck, 1917
Cryptus incertus Cresson, 1864
Cryptus ultimus Cresson, 1864
Hemiteles annulicornis Ashmead, 1890
Hoplocryptus incertulus Cushman, 1925
Phygadeuon longicornis Provancher, 1886
Spilocryptus exannulatus Cushman, 1919