Macrorhynchia is a genus of hydroids in the family Aglaopheniidae.
According to the World Register of Marine Species, the following genera are synonyms of this genus:
Lytocarpus Allman, 1883
Nematophorus Clarke, 1878
The following species are classified in this genus:
Macrorhynchia allmani (Nutting, 1900)
Macrorhynchia ambigua Watson, 2000
Macrorhynchia asymmetrica Di Camillo, Puce & Bavestrello, 2009
Macrorhynchia balei (Nutting, 1905)
Macrorhynchia clarkei (Nutting, 1900)
Macrorhynchia disjuncta (Pictet, 1893)
Macrorhynchia filamentosa (Lamarck, 1816)
Macrorhynchia fulva Di Camillo, Puce & Bavestrello, 2009
Macrorhynchia furcata (Nutting, 1900)
Macrorhynchia grandis (Clarke, 1879)
Macrorhynchia gravelyi Mammen, 1967
Macrorhynchia hawaiensis (Nutting, 1906)
Macrorhynchia hornelli (Thornely, 1904)
Macrorhynchia meteor El Beshbeeshy, 1995
Macrorhynchia mulderi (Bartlett, 1907)
Macrorhynchia nuttingi (Hargitt, 1927)
Macrorhynchia philippina Kirchenpauer, 1872
Macrorhynchia phoenicea (Busk, 1852)
Macrorhynchia protecta (Antsulevich, 1992)
Macrorhynchia quadriarmata Watson, 2000
Macrorhynchia racemifera (Allman, 1883)
Macrorhynchia ramosa (Fewkes, 1881)
Macrorhynchia savignyana Kirchenpauer, 1872
Macrorhynchia sibogae (Billard, 1913)
Macrorhynchia similis (Nutting, 1906)
Macrorhynchia singularis (Billard, 1908)
