Diphasia digitalis (Busk, 1852)

Watson, Jeanette E., 2012, Some hydroids (Hydrozoa: Hydroidolina) from Dampier, Western Australia: annotated list with description of two new species., Memoirs of Museum Victoria 69, pp. 355-363 : 359

Measurements of Diphasia digitalis , (µm)

Internode distance between hydrothecae 1020–1300 width across hydrothecal base pair 256–384

Hydrotheca adcauline wall length adnate 800–840 adcauline wall length free 240–300 width across margin 264–296 width at floor 92–100

Remarks. The hydrothecae contain much adventitious matter presumably acquired during collection. The margins of most hydrothecae are damaged.

The specimens conform to previous descriptions of Diphasia digitalis from Australia ( Watson 2000). The longitudinal hydrothecal pleat is inconspicuous and may be due to the young age of the colony.

Distribution. Circumglobal in tropical and subtropical waters. Australian distribution – Torres Strait ( Busk 1852), Queensland ( Pennycuik 1959), north– western Australia ( Watson 1996, 2000).