Glycerella magellanica McIntosh 1885

Glycerella magellanica (McIntosh, 1885)

(Fig. 8)

Hemipodus (?) magellanicus McIntosh, 1885: 349; pl. 42, figs 11–15; pl. 22A, figs 12–15; pl. 35A, figs 5, 7. Synonyms see Böggemann 2002

Material examined. AM W.47211 (2), Great Barrier Reef, Outer Yonge Reef, rock with Lithothamnion and Halimeda, 30 m, 21 Jan 1977, 30 m, cs/4.8/29/0.4/0.2, af/8/38/1.3/0.7.

Diagnosis. Proboscidial papillae digitiform with straight, median, longitudinal ridge; ailerons rod-like; parapodia of mid-body with blunt triangular notopodial and slightly shorter, rounded neuropodial postchaetal lobes; branchiae absent.

Description. Body at least 8 mm long with at least 38 chaetigers. Mid-body segments tri-annulate.

Conical prostomium consisting of 4 rings, posteriormost annulus with indication of a 5th ring; terminal ring with four long appendages and basal one with pair of nuchal organs (Fig. 8 A).

Proboscis with one type of papillae: numerous digitiform papillae with more or less distinctly straight, median, longitudinal ridge on posterior surface (Fig. 8 B). Terminal part of proboscis with four hook-shaped jaws arranged in a cross and accessory rod-like ailerons (Fig. 8 C).

First two pairs of parapodia uniramous; following parapodia biramous (Fig. 8 D–H). Two slender triangular to digitiform prechaetal lobes; notopodial lobe always slightly longer and wider than neuropodial lobe. Two shorter postchaetal lobes; anteriorly both lobes rounded; in following parapodia notopodial lobe elongated and blunt triangular, slightly longer than rounded neuropodial lobe. Dorsal cirri from 1st or 2nd parapodium, conical to oval; inserted - most clearly in anterior part of body - on body wall above parapodial base. Ventral cirri in anterior parapodia relatively wide and conical, in posterior parapodia more slender triangular to digitiform, about as long as neuropodial postchaetal lobe or slightly shorter; situated near parapodial base. Branchiae absent.

Noto- and neuropodia each with a single acicula (Fig. 8 D–H). Notochaetae capillaries. Neurochaetae compound spinigers and falcigers with blades of different lengths.

Pygidium with dorsal anus and terminal pair of slender, elongated cirri.

Remarks. Larger anterior fragment with dorsal cirri on 1st parapodium, which are very small and more oval to globular.

Distribution. Yonge Reef; 30 m.