This new species like other members of also possess Corallimorphus stiff and hyaline mesoglea, short column relative to its broad oral disc, and deep-sea habitat.

[2] The specie name “niwa” honors the New Zealand National Institute of Water and Atmospheric Research.

Deep-sea species are typically isolated, while shallow-water forms are often clonal, they reproduce asexually by fission or pedal laceration.

Due to the mesoglea's thickness their consistency ranges from rigid to soft, and they often produce copious mucus.

Mesenteries are irregularly arranged, with weak retractor muscles, and the gametogenic region is at the same level as the filaments.

[6] The oral disc is generally circular, varying from flat to strongly domed, with a diameter ranging from 30 to 125 mm in the specimens studied.

The column is very short, measuring 10 to 30 mm, and can be either straight or curved inward, making the mid-column narrower than both the oral and pedal discs.

The colors of these organisms vary, with the oral disc ectoderm typically appearing brownish or rust red along the mesenterial insertions.

The distal end of the actinopharynx is exposed and displays a red coloration in individuals that retain their pigmentation.

[8] Locality type: Northern edge of Chatham Rise (42.5390–42.5433ºS, 178.3382–178.3400ºE), at 1404–1414 m. [9] Geographic and bathymetric distribution: Corallimorphus niwa n. sp.