Jerarquía taxonómica:
Phyllodocidae → Hesionura elongata (Southern, 1914)

Familia:
Phyllodocidae

Autor:
(Southern, 1914)

Sinónimos:
Mystides elongata Southern, 1914
Mystides (Mesomystides) elongata Southern, 1914
Eteonides elongata Southern, 1914