Robuta

https://marinespecies.org/hydrozoa/aphia.php/api-docs/css/aphia.php?p=taxdetails&id=1549518

Hydrozoa - The World Hydrozoa Database - Halecium gardineri Jarvis, 1922

hydrozoa world database halecium jarvis

https://www.marinespecies.org/aphia.php?p=taxdetails&id=389572

WoRMS - World Register of Marine Species - Halecium tabulatum Watson, 2005

marine species worms world register halecium