Dasynema chrysogyrus (Grube, 1876)

(Fig. 1 C)

Serpula chrysogyrus Grube, 1876: 73 [Philippines].

Serpula chrysogyrus . — Grube 1878: 276 –278, pl. 15, fig. 8 [Philippines]; Andrews 1891: 289 [same]; McIntosh 1926: 412 [same].

Dasynema chrysogyrus . — Saint-Joseph 1894: 262, 264 [species placed in new genus]; Imajima & ten Hove 1984: 56–58, fig. 6 a–t [Ponape Island; detailed description]; ten Hove & Kupriyanova 2009: 38 –39, fig. 14 [SEM of chaetae and radiolar crown]; Bailey-Brock et al. 2012: 968 –970, fig. 2 [Marshall Islands].

Not Dasynema chrysogyrus . — Nishi 1993c: 145 –146, figs 1, 2 [Okinawa, Japan; see Remarks].

Material examined. AM W.45087, MI QLD 2424; ZMA V.Pol. 4539 (2), stn.18, lagoon near East entrance, sheltered side of reef, near sandy bottom, 2–20 m, coll. H. ten Hove, 3 Mar 1986; ZMA V.Pol. 4540, stn.20, reef front north of South Island, sloping reef outside lagoon & sandy bottom below, 10–17 m, coll. H. ten Hove, P. Hutchings & M. Reid, 5 Mar 1986.

Diagnosis. Tubes elaborate with five longitudinal ridges of tubercles; pale dull yellow with white ridges. Radioles with slender external stylodes in a single row; paired eyespots at the base of stylodes. Operculum with light-brown chitinous cap.

Remarks. The preserved material of Dasynema could be mistaken for species of Vermiliopsis glandigera / pygidialis -complex based on tube and opercular characters since stylodes have to be teased carefully away from the radiole to be seen in some specimens. The record of Dasynema in Okinawa (Nishi 1993c) is based on a misidentification because the reported specimen lacks stylodes and thus, does not belong to this genus (Nishi pers. comm.), but probably belongs to the Vermiliopsis glandigera / pygidialis -complex.

Distribution. Philippines: Ponape Island, Eastern Caroline Islands; Okinawa, Japan; Qld, Australia; Marshall Islands. First record for Lizard Island.