Biota (Life)
Eukaryote (Eukarya)
Podiata
Unikont (Unikonta)
Opisthokont (Opisthokonta)
Holozoa
Filozoa
Apoikozoa (Choanozoa)
Animal (Animalia)
Metazoa
Epitheliozoa
Eumetazoa
Bilateria
Nephrozoa (Eubilateria)
Protostome (Protostomia)
Ecdysozoa (Ecdysozoan)
Panarthropoda
Tactopoda
Arthropoda (Arthropod)
Mandibulata
Tracheata
Uniramia
Pancrustacea
Crustacea (Crustaceans)
Maxillopoda (Maxillopod)
Copepod (Copepoda)
Neocopepoda
Podoplea
Harpacticoida (Harpacticoid copepods)
Cletopsyllidae
Children (3 direct children, 3 direct and indirect children):
Retrocalcar brattstroemi
Retrocalcar sagamiensis
Retrocalcar secundus