Hadrognathus

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Cladus: Panarthropoda
Phylum: Arthropoda
Subphylum: Hexapoda
Classis: Insecta
Cladus: Dicondylia
Subclassis: Pterygota
Cladus: Metapterygota
Infraclassis: Neoptera
Cladus: Eumetabola
Cladus: Endopterygota
Superordo: Coleopterida
Ordo: Coleoptera
Subordo: Polyphaga
Infraordo: Staphyliniformia
Superfamilia: Staphylinoidea

Familia: Staphylinidae
Subfamilia: Omaliinae
Tribus: Hadrognathini
Genus: Hadrognathus
Species: H. cantabricus – H. longipalpis
Name

Hadrognathus Schaum, 1852: 31 [nom. nov.]

Type species: Eugnathus longipalpis Mulsant & Rey, 1851, fixed by autotypy.

Synonymy

Eugnathus Mulsant & Rey, 1851: 141 [preoccupied, not Eugnathus Schönherr 1833 (Curculionidae), Eugnathus Agassiz 1836 (Pisces)]
Eugnathus Mulsant & Rey, 1852: 1 [synonymic homonym]
Oncognathus' Lacordaire, 1854: 144 [new name for Eugnathus Mulsant & Rey]

References
Primary references

Schaum, H.R. 1852. Catalogus Coleopterorum Europae. Vierte Auflage. Entomologischen Verein in Stettin, Berlin. v + 96 + 1 + 12 pp. [nom. nov.: p. 31]