Dasynema chrysogyrus ( Grube, 1876 )

Kupriyanova, Elena K., Sun, Yanan, Ten Hove, Harry A., Wong, Eunice & Rouse, Greg W., 2015, Serpulidae (Annelida) of Lizard Island, Great Barrier Reef, Australia, Zootaxa 4019 (1), pp. 275-353 : 279

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.

Figures

FIGURE 1. A. Crucigera tricornis, live animal, stn. G 231, SAM E 3587; B. Live animal, stn. G 238, AM W. 47450; C. Dasynema chrysogyrus, anterior lateral view of fixed specimen (stained with methylene blue), operculum missing, AM W. 45087, arrow indicates radiolar stylodes. Photo: A, B—G. Rouse, C—E. Wong. Scale bars: A = 1 mm, B = 1 mm, C = 0.5 mm.