Crucigera irregularis Bush, 1905

Bastida-Zavala, J. Rolando, 2008, Serpulids (Annelida: Polychaeta) from the Eastern Pacific, including a brief mention of Hawaiian serpulids, Zootaxa 1722, pp. 1-61 : 16

Crucigera irregularis Bush, 1905

( Figures 4A–B)

Crucigera irregularis Bush, 1905: 234 , pl. 25, fig. 5; pl. 29, fig. 4; pl. 33, fig. 13; pl. 39, figs. 1–5. Type locality: Juneau , Alaska.

Crucigera irregularis .— ten Hove and Jansen-Jacobs, 1984: 170–176, figs. 3b, 4f–g, 5c, 8e–f, 9k–o, 10b, 11j–o, 12 (revision of the genus).

Material examined. Five specimens: Alaska ( USA), LACM-AHF N2127 (approx. 57º10’N, 169º40’W, Bering Sea , 20 km east of Walrus Island , Pribilof Islands, Alaska King Crab Investigation, sta. D11.41, 57–60 m) ; LACM-AHF N2789 (approx. 55º55’N, 161º27’W, Canoe Bay , from crab trap, Sept. 23, 1940, coll. N.L. Schmitt) ; LACM-AHF N10728 –10729 , 3 spec. (sta. 72A D2, no more data) .

Diagnosis. Tube smooth, thick-walled, lacks longitudinal ridges, peristomes or alveoli. Opercular peduncle smooth, white. Base of operculum with rounded dorsal process. Operculum one irregular funnel, with apex displaced to ventral side; funnel with 21–47 radii with rounded tips ( Figs 4A–B). Collar with bayonet chaetae, with 2–3 blunt-short teeth and minute accessory teeth, distal blade smooth.

Habitat. Depth: 57–60 m; ten Hove and Jansen-Jacobs (1984) recorded it down to 274 m. Cold waters.

Distribution. North-eastern Pacific. Alaska to Oregon, USA ( ten Hove & Jansen-Jacobs 1984).

Remarks. Crucigera irregularis and C. zygophora are sympatric species ( ten Hove & Jansen-Jacobs 1984); even, the tube of one specimen of C. irregularis (LACM-AHF N2789) is attached over the tube of C. zygophora .