Glycera tesselata Grube, 1863

Magalhães, Wagner F. & Rizzo, Alexandra E., 2012, Glyceridae (Annelida: Polychaeta) from Guam, Mariana Islands with description of a new species of Glycera Savigny in Lamarck, 1818, Zootaxa 3338, pp. 60-68 : 65-67

Glycera tesselata Grube, 1863

Figure 4 (A–F)

Glycera tesselata — Böggemann, 2002 and references therein: 47–48, Figs. 37–39; Imajima, 2003: 117, Fig. 69h–l; Imajima, 2005: 81; Rizzo et al., 2007: 46 –47, Fig. 13; Imajima, 2011: 171.

Material examined. Pacific Ocean — Guam EPA Coastal EMAP; station 39, 13° 16' 51.17" N, 144° 45' 44.26" W, 10/Jan/2005 (1, BPBM R3569; incomplete with partly everted proboscis); station 25, Tanguisson Point, 13° 35' 8.50" N, 144° 49' 56.09" W, 31/Jan/2005 (1, BPBM R3570; incomplete, proboscis partly everted); station 37, Haputo Bay, 13° 34' 39.74" N, 144° 49' 49.14" W, 10/Jan/2005 (1, BPBM R3571; complete, proboscis not everted); station 41, reef margin East Hagatna Bay, 13° 29' 1.1" N, 144° 45' 18.62" W, 14/Dec/2005 (1, complete, proboscis completely everted showing jaws); station 30, Dadi Beach, 13° 24' 28.15" N, 144° 39' 12.77" W, 04/Apr/2005 (1, BPBM R3572; complete, proboscis not everted); station 11, outside Cocos Lagoon, 13° 15' 52.22" N, 144° 38' 15.9" W, 04/Apr/2005 (3, BPBM R3573; 2 incomplete, 1 complete, proboscis partly everted in all). Agana Ocean Outfall, 13° 29' 14" N, 144° 44' 54" W, Aug/2005, station A2R2 (5, BPBM R3574; all completes, proboscis not everted), station A3R1 (3, BPBM R3575; all completes, proboscis not everted).

Description. Complete specimens ranging from 5–8 mm long for 40–63 chaetigers. Mid-body segments biannulate with same sized annuli.

Conical prostomium with about 9 rings ( Fig. 4 A). Proboscis with two types of papillae arranged in several longitudinal rows with subapical tufts of cilia: 1. numerous digitiform papillae with straight, median, longitudinal ridge on posterior surface; 2. isolated, shorter and broader conical papillae with not easily distinguishable longitudinal ridges ( Fig. 4 A–C). Proboscis with four terminal hook-shaped jaws and ailerons with deeply incised base.

First two parapodia uniramous; following parapodia biramous. Two slender triangular to digitiform prechaetal lobes; neuropodial prechaetal lobe usually slightly longer and wider than notopodial one; both lobes becoming slightly slimmer in posterior parapodia; in last parapodia, notopodial lobe distinctly shorter than neuropodial one ( Fig. 4 D). Two same-sized shorter, rounded, postchaetal lobes ( Fig. 4 D). Dorsal cirrus from third parapodium, conical to oval; inserted on body wall far above parapodial base, most clearly in anterior part of body ( Fig. 4 D). Ventral cirrus slender triangular to digitiform, about as long as postchaetal lobes; in posterior parapodia slender and elongated; in last parapodia about as long as neuropodial prechaetal lobe; situated medio-ventrally on parapodia ( Fig. 4 D). Branchiae absent.

Notopodia with up to 3 capillaries with spinules covering one side of the blade ( Figs 4 D, E). Neuropodia with 4–5 compound spinigers with blades of different lengths and spinules along blades ( Figs 4 D, E).

Pygidium with dorsal anal aperture and a pair of slender cirri, as long as last 4–5 segments ( Fig. 4 F).

Remarks. Glycera tesselata differs from other species of the genus by having proboscidial papillae mainly digitiform with straight, median, longitudinal ridge; ailerons with deeply incised bases; parapodia of mid-body with two short, rounded postchaetal lobes; and absence of branchiae.

Distribution. This species is widely distributed in the Atlantic, western Indian and western Pacific oceans. In the western Pacific, it has been found in the Hawaiian Islands ( Hartman, 1966; Bailey-Brock, 1987), Guam, Saipan, and Uracas in the Mariana Islands ( Bailey-Brock, 1999, 2003; Böggemann, 2002), Marshall Islands ( Hartman, 1954; Reish, 1968, Bailey-Brock et al., 1980; Kohn, 1980; Devaney & Bailey-Brock, 1987); Japan ( Böggemann, 2002; Imajima, 2003, 2005, 2011) and Papua New Guinea ( Böggemann, 2002).

Figures

FIGURE 4. Glycera tesselata. A, anterior end, dorsal view; B, proboscidial papillae: types 1 and 2, posterior view; C, posterior view of type 1 papillae; D, parapodia from mid-body chaetiger, posterior view; E, simple capillaries and spinigerous compound chaetae; F, last chaetigers and pygidial cirri, ventro-lateral view. (dc, dorsal cirrus, vc, ventral cirrus, pre, prechaetal lobes, post, postchaetal lobes, noto, notopodium).