Hydrorhiza tubular, of same diameter as stems. Stems simple, short, unbranched, to 3 mm long. Proximal stem internode short, athecate, with 4-5 annulations, width 0.13 mm; following internodes of variable length, 0.50-1.05 mm.
Hydrothecae large, perisarc delicate, alternate, in one plane, a maximum of 4 on stem, not immersed in internode, distal on long internodes, occupying almost the whole length of short internodes, without definite floor, barrel shaped, widest about middle, narrowing only slightly to margin. Length of fixed adcauline wall 0.22-0.28 mm, free adcauline wall 0.210.30 mm; abcauline wall 0.45-0.53 mm. Margin 0.28-0.31 mm in diameter, thickened, with 3 equidistant bluntly pointed teeth: 1 adcauline, 2 lateral abcauline. Operculum of 3 delicate flaps. No internal submarginal teeth. Hydranth with approximately 24 tentacles and an abcauline caecum.
Gonothecae large, ovate, nearly 3 times length of hydrotheca, 1.11-1.35 mm long, widest at top, 0.87-1.02 mm, tapering to a short pedicel arising below proximal hydrotheca, walls faintly undulated proximally, the annulations more distinct about mid-region. Aperture small, circular, 0.13-0.15 mm in diameter, depressed into the most distal annulation of the gonothecal wall; 4 very low rounded teeth. Gonophores female, mature, not filling gonothecal cavity, with 10-16 eggs.
From South Australia (Pearson Island).
Epizoic on other hydroid species.
Subtidal to 30 m, epizoic on hydroids.