Gymnangium japonicum Watson and Vervoort

Watson, Jeanette W., 2003, Deep-water hydroids (Hydrozoa: Leptolida) from Macquarie Island, Memoirs of Museum Victoria 60 (2), pp. 151-180 : 173

Gymnangium japonicum Watson and Vervoort

Figures 23A, B

Gymnangium japonicum Watson and Vervoort, 2001: 182 , figs 15a–g.

Halicetta sp. — Hirohito, 1995: 293, figs 103e–g, pl. 13 fig. D.

Material examined. Stn 122, TM K2789, specimen alcohol-preserved, NMV F91351, malinol-mounted microslide from same colony; broken infertile stem 50 mm long, detached from substrate.

Distribution. Originally recorded (as Halicetta sp. ) from a depth of 250 m from Japan ( Hirohito, 1995), from 750–900 m south-east of Tasmania ( Watson and Vervoort, 2001).

Remarks. The material conforms exactly with the description and dimensions of Gymnangium japonicum Watson and Vervoort, 2001 reported from deep water seamounts south-east of Tasmania. The stem is golden brown, hydrocladia yellowish-green.

Figures

Figures 23A–C. Gymnangium japonicum, stn 122. A, colony. B, hydrocladial hydrothecae. C, cauline internodes with tubular nematocysts (after Watson and Vervoort 2001). A, 20 mm; B, C, 0.5 mm.