Metavermilia nates Zibrowius, 1971

(Fig. 13 C, D)

Mevermilia (sic!) nates Zibrowius, 1971: 1380 –1381, fig. 4 [Europa Island, Mozambique Channel, Tanzania Coast].? Vermiliopsis multicristata . — Monro 1937: 319 [Tanzania; fide Zibrowius 1971: 1380].

Metavermilia nates . — Imajima 1979: 171 –173, fig. 5 [Southern tip of Honshu, Japan]; Imajima & ten Hove 1984: 54 [Ponape Island]; ten Hove & Kupriyanova 2009: 63 [name only].

Material examined. AM W.47588, stn.G239, Reef crest to south of Bird Islet, coll. G. Rouse & E. Kupriyanova, 31 Oct 2005; AM W.47589, stn.G242, east lagoon near Bird Islet, 1 Nov 2005 (1, branchia with operculum); SAM stn.G246, off Granite Bluff, coll. G. Rouse & E. Kupriyanova, 3 Nov 2005; ZMA V.Pol. 4694, stn.19, Turtle Beach, intertidal boulders & cobbles in coarse sand, coll. H. ten Hove, 5 Mar 1986.

Diagnosis. Operculum complex, consisting of basal ampulla, often with mid-dorsal groove, distal part composed of 4–10 parallel tiers with dorsal indent and terminating with flat disk; tube with 5–9 longitudinal teethed keels (Fig. 13).

Remarks. Zibrowius (1971) also mentioned enlarged tips of branchial radioles in M. nates as a specific character.

Distribution. Europa Island, Tanzania; Red Sea; Ponape Island; Honshu, Japan. New record for Australia.