Glycera cf. lapidum Quatrefages, 1866

Böggemann, Markus, 2015, Glyceriformia Fauchald, 1977 (Annelida: “ Polychaeta ”) from Lizard Island, Great Barrier Reef, Australia, Zootaxa 4019 (1) : -

Glycera cf. lapidum Quatrefages, 1866

( Figs 3 , 10 B)

Glycera lapidum Quatrefages, 1866: 187 . Synonyms see Böggemann 2002

Material examined. AM W.46201, Great Barrier Reef, Outer Yonge Reef, rock with Lithothamnion and Halimeda , 30 m, 21 Jan 1977, cs/7.3/54/0.7/0.4, part of proboscis on SEM stub.

Diagnosis. Proboscidial papillae mainly digitiform with undulating ridge; ailerons with slight dent in pointed triangular bases; parapodia of mid-body with distinctly longer neuropodial than notopodial prechaetal lobes; one rounded postchaetal lobe; branchiae absent.

Description. Body 7.3 mm long with 54 chaetigers. Mid-body segments more or less distinctly tri-annulate.

Conical prostomium consisting of about 11 rings; terminal ring with four appendages and basal one with pair of nuchal organs ( Fig. 3 A).

Proboscis with two types of papillae: l. numerous digitiform papillae with indistinct ridges on posterior surface; 2. isolated, shorter and broader, more conical papillae without ridges ( Figs 3 B, 10B). Terminal part of proboscis with four hook-shaped jaws arranged in a cross and accessory ailerons with slight dent in pointed triangular base ( Fig. 3 C).

First two pairs of parapodia uniramous; following parapodia biramous ( Fig. 3 D–K). Two slender triangular to digitiform prechaetal lobes; neuropodial lobe always distinctly longer and wider than notopodial lobe; both lobes becoming slightly thinner in posterior parapodia; in last parapodia notopodial lobe much shorter than neuropodial one. One shorter, rounded postchaetal lobe. Dorsal cirri from 3rd parapodium, oval to globular; inserted - most c1early in anterior part of body - on body wall far above parapodial base. Ventral cirri 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 near parapodial base. Branchiae absent.

Noto- and neuropodia each with a single acicula ( Fig. 3 D–K). Notochaetae capillaries. Neurochaetae compound spinigers with blades of different lengths.

Pygidium with dorsal anus; cirri not observed.

Remarks. The specimen is a juvenile with, for example, incompletely hardened ailerons and poorly defined proboscidial papillae and therefore only uncertainly referred to Glycera lapidum .

Distribution. Yonge Reef; 30 m.

Figures

FIGURE 3. Glycera cf. lapidum Quatrefages, 1866, AM W. 46201. A. Anterior end with partly everted proboscis, dorsal view; B. Proboscidial papillae; C. Aileron; D – K. Anterior to posterior parapodia, posterior view, aciculae suggested, chaetae omitted.

FIGURE 10. Proboscidial papillae of Glycera spp. A. Glycera brevicirris, AM W. 44482; B. Glycera cf. lapidum, AM W. 46201; C. Glycera onomichiensis, AM W. 47220; D. Glycera sagittariae, AM W. 47221; E. Glycera tesselata, AM W. 45499; F. Glycera tridactyla, AM W. 47222.